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初中三年级英语

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    用所给词的适当形式填空。
    1. If I           (fail) the exam, you wouldn't be so happy.
    2. If I           (be) there, I would stop him from doing so.
    3. If it           (be) fine tomorrow, we           (go) shopping.
    4. He           (help) us if he had time.
    5. He showed us how            (get) to the hall with the ID card.
    本题信息:2012年同步题英语填空题难度一般 来源:段秀玲
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本试题 “用所给词的适当形式填空。1. If I (fail) the exam, you wouldn't be so happy.2. If I (be) there, I would stop him from doing so.3. If it (be) fine tom...” 主要考查您对

实义动词的过去式

系动词

一般现在时

一般将来时

宾语从句

状语从句

虚拟语气句

等考点的理解。关于这些考点您可以点击下面的选项卡查看详细档案。
  • 实义动词的过去式
  • 系动词
  • 一般现在时
  • 一般将来时
  • 宾语从句
  • 状语从句
  • 虚拟语气句
表示一般过去式的动词通常用动词的过去式形式来表示,而动词的过去式是在动词原形的基础上变化的。
动词的过去式可分为规则动词和不规则动词。

实意动词过去式变化规则:

分类 构成 例句
一般情况下 在词尾直接加ed ask—asked
work—worked
以不发音的e结尾 只加d

love—loved

dance—danced

以辅音字母加y结尾 变y为i,再加-ed try—tried
study—studied
以一个元音字母和一个辅音结尾的
重读音节结尾的动词
先双写末尾一个字母,再加ed stop—stopped
permit—permitted
“-ed”的读音规则 1.在清辅音后面读[t],如:help—helped[helpt]
2.在浊辅音或元音后读[d],如:learn—learned
3.在[t]和[d]后读[id],如:want—wantedneed—needed
注:以l结尾的动词,尾音节重读时,双写l,如control—controlled;
尾音节不重读时,双不双写都可以,如travel—traveled/traveled。
特例:picnic—picnicked,另外还有很多动词的过去式是不合乎上述规则的,常见的有:
常用的有:
begin—began,         bring—brought,        come—came,        draw—drew,
drink—drank,          drive—drove,          eat—ate,                feel—felt,
get—got,                  give—gave,              go—went,             grow—grew,
have (has)—had,      keep—kept,            know—knew,       leave—left,  
make—made,           read—read,            run—ran,               say—said,
see—saw,                sit—sat


几个特殊实意动词过去式用法:
a.beat的过去式与原形同形:   
beat(打击) 
beat(过去式) 
beaten(过去分词)   
b.lie有规则变化和不规则变化两种,含义不同   
lie,lied, lied(说谎)   
lay, lain(躺,位于)   

c.hang有规则变化和不规则变化两种,含义不同   
hang,hanged, hanged(处绞刑)   
hung, hung(挂,吊)   

d. welcome(欢迎)一词是规则动词,不可误用为不规则动词   
welcome welcomed, welcomed(正)   
welcome, welcome(误)   

e.不要将不规则动词误用为规则动词   
hit(打) 
hit, hit(正)   
hitted, hitted(误) 


实意动词过去式用法基本句式:
1.主+V-ed+宾+其它。。。(肯定句)
2.主+didn't+V原+宾+其它。。。
3.Did+主+V原+宾+其它。。。+?
4.回答:Yes,主语代词+didNo,主语代词+didin't.
5.特殊疑问句:特殊疑问词+一般疑问句。
实义动词的一般过去时态:
肯定句要使用动词的过去式,否定句和疑问句要使用助动词do和 does 的过去式 did.

肯定句为:
主语+动词过去式+宾语    如:
I went home at nine o'clock yesterday.

否定句:
主语+didn't +动词原形+宾语  如:
I didn't go home yesterday.  He didn't tell me about you.

疑问句:
一般疑问句:
Did +主语+动词原形+宾语
如:Did you go home yesterday?  
Did you study in the school?
肯定回答: Yes, I did.    
否定回答:No, I didn't.

特殊疑问句:特殊疑问词+did +主语+动词原型+宾语
When did you finish your homework last night?      
What did you do the day before yesterday?
系动词
亦称连系动词。作为系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语,亦称补语(形容词),构成系表结构说明主语的状况、性质、特征等情况。
系动词的分类:
1)状态系动词
用来表示主语状态,只有be一词,例如:
He is a teacher. 他是一名教师。(is与补足语一起说明主语的身份。)
2)持续系动词
用来表示主语继续或保持一种状况或态度,主要有keep, rest, remain, stay, lie, stand, 例如:
He always kept silent at meeting. 他开会时总保持沉默。
This matter rests a mystery. 此事仍是一个谜。
3)表像系动词
用来表示"看起来像"这一概念,主要有seem, appear, look, 例如:
He looks tired. 他看起来很累。
He seems (to be) very sad. 他看起来很伤心。
4)感官系动词
感官系动词主要有feel, smell, sound, taste, 例如:
This kind of cloth feels very soft.
这种布手感很软。
This flower smells very sweet.
这朵花闻起来很香。
5)变化系动词
这些系动词表示主语变成什么样,变化系动词主要有become, grow, turn, fall, get, go, come, run.
例如:
He became mad after that. 自那之后,他疯了。
She grew rich within a short time. 她没多长时间就富了。
6)终止系动词
表示主语已终止动作,主要有prove, turn out, 表达"证实","变成"之意,例如:
The rumor proved false. 这谣言证实有假。
The search proved difficult. 搜查证实很难。
His plan turned out a success. 他的计划终于成功了。(turn out表终止性结果)

系动词使用的注意事项:
系动词本身有一定的词义,不能单独作
谓语,后面必须与表语连用。复习系动词时,必须注意以下几个问题:

1.be是最重要的系动词,主语不同,be的形式也不同,且有时态的变化。

a通常表示主语的特征、状态和身份等,后面接形容词、副词、名词、介词短语、不定式v-ing过去分词表语从句作表语。

b特别要注意be+过去分词所构成的系表结构be+过去分词所构成的被动语态的区别。

c前者侧重于表示主语的特征或所处的状态,通常没有由by引导的介词短语。

如:The door was closed.

后者侧重于强调主语是谓语动词所示动作的承受者,表示动作;句中可以用由by引导的介词短语。如:The door was closed by me.

d还要注意be+ V-ing所构成的系表结构be+ V-ing”所构成的进行时态的区别。

前者侧重于说明主语具有的特征或存在的状态,也可说明主语是什么。如:My job is teaching English.

后者侧重于强调主语正在做某事。如:Mr Wang is reading an evening paper now.


2.
要注意由行为动词转化成的系动词。

a表示人体感官的系动词有soundtastelookfeelsmell等,后面接形容词;

b表示主语从一种状态转变到另一种状态的系动词有becomegetgoturnrungrowcomefallprove等,后面接形容词、名词或 to be+形容词,become后面接单数名词时,名词前要用不定冠词turn后面接单数名词时,名词前不用不定冠词

c表示主语继续或保持某种身份、特征状态的系动词有continuekeepremainstaystand liereststay等,后面接表示状态的形容词;

d表示判断的系动词有seemappear,后面接形容词、to be+名词或形容词、that-clause、不定式等。


3.
要注意系动词的固定搭配。常见的有come true, fall asleep, fall ill, go bad, come right, run wild, wear thin, turn nasty等。


4.
要特别注意某些动词既可以做系动词,又可以做实意动词的用法。

系动词部分主要注意:
其后要求接形容词,而不是
副词表语。遇到这种情况,只能先根据其意思判断清楚到底是前者还是后者,然后再对后面的词性和词义做出正确判断和选择。
taste一词为例:

The newly-invented soft drinking tastes quite unique.
(这种新研制的软饮料尝起来挺独特的。
注意:在这句话里,
taste做系动词,不能使用进行时,后面接形容词。)

The chef is tasting the fish carefully.
(厨师长正在品尝这道鱼。
注意:在这句话中,
taste实意动词,可以使用进行时,并且后面接副词做状语。)


系动词用法点拨:
1.系动词的进行时态应分情况讨论。
一般地说,状态系动词无进行时态,而动态系动词有进行时态。
但是在某些情况下,状态系动词也有进行时态,表示两个用途:
一是表示一种短暂的、反常的状态。如:
He is being kind.(一时而不能持久的性质)他装出和蔼可亲的样子。
二是表示一种探询口气,使语言客气、生动、亲切。例如:
I hope you are keeping well.(语气委婉)我希望你保持健康。
Are you feeling any better?(语气亲切)你感觉好了些吗?
试比较:
Your hand feels cold.(无意识的静态性质。)你的手摸起来冰凉。
不可以说:
Your hand is feeling cold.(×)
但可以说:
The doctor is feeling her pulse.(有意识的动态动作)医生正在给她拿脉。
The soup tastes good.(静态性质,无进行时)这汤的味道不错。
The cook is tasting the soup.(动态动作,有进行时)厨师在尝汤的味道。

总之,系动词有无进行时态应随系动词的意义或其语境变化而变化。
我们在概述某一动词的进行时态时,不能笼统地说feel,smell无进行时,应指出其意义及其语用环境。
例如smell的用法可见一斑。
①smell作“嗅觉”的能力时,虽是实义动词,但指的是一种性质的存在状态不能用于进行时态,常与can, could, be able to连用。
The camels can smell the water a mile off.骆驼能嗅出一英里外有水。
②指“嗅、闻”的动作时,实义动词,可用于进行时态。
The girl is smelling the flower.这姑娘正在闻那朵花。
③smell指“含有……气味”,“发出……气味”等事物性质时,半系动词,无进行时态。
The dinner smells good.这饭菜闻起来真香。

2.系动词的时态与形容词的比较级连用的问题。
某些含有变化意义的动态系动词如get, become, grow, turn等的进行时态可与形容词的比较级连用,表示渐进过程,其意思是“越来越……”。例如:
He is growing taller and taller.他长得越来越高了。
Our life is getting better and better.我们的生活是越来越好了。
The things are getting worse.情况是越来越糟了。

3.所有半系动词的被动语态要分情况讨论。
英语中某动词在作系动词用时,无被动语态,而作实义动词用时,才有被动语态,二者不可混为一谈。例如:
不能说:
The apple is tasted good.
(因为taste此时是系动词,“尝起来”之意,指的是苹果的性质,无被动语态)
但我们可以说:
The apple is tasted by me.这苹果被我尝了一下。
(taste此时指“尝一尝”这一动作,有被动语态)
因此,在平时的英语教学和学习之 ,要有意注意半系动词在具体的语言环境中到底是系动词用法还是实义动词用法,要注意区分、识别。

4.瞬间动态系动词能否与时间段连用的问题
英语中某些表示瞬间意义的系动词不能与“for+时间段,since+时间点,how long until+时间,by + 时间,so far”等直接连用。例如:
①不能说:He has become a teacher for 2 years.
应改为:He has been a teacher for 2 years.
②不能说:He has turned writer since 3 years ago.
应改为:He has been a writer since 3 years ago.
或It is three years since he turned writer.
③不能说:He got angry until his child came back home.
应改为:He didn’t get angry until his child came back home.

5.系动词能接几种表语(从句)
系动词除了接adj. .prep.短语,某些adv.以外,还可接以下几种表语形式:
①能接as if/as though表语从句的系动词有:look(看起来),smell(闻起来),sound(听起来),feel(觉得);appear(显得),seem(似乎)。例如:
It looks as if we are going to have snow.看样子天要下雪了。
He looked as if he had just stepped out of my book of fairy tales.
他看来好像刚从我的童话故事中走出来似的。
She seemed as if (though) she couldn’t understand why Laura was there.
看来她好像不能理解为什么劳拉呆在那儿。
It sounds to me as though there’s a tap running somewhere.
我好像听到某处水龙头流水的声音。
She felt as if her head were splitting.
她仿佛觉得她的头要裂开了。
The river appeared as if enveloped in smog.
那条河好像笼罩在烟雾之中。
It seems as if it were spring already.
好像已是春天了。
②可用于“It+系动词+that从句”结构的有:seem, appear, 不可用be, look。如:
It seemed that he had made some serious mistakes in his work.
好像他在工作中犯了严重错误。
It appeared that he was talking to himself.
好像他在自言自语。
③能用不定式作表语的系动词有:be, seem, get, look, appear, prove, grow.
Her job is to look after the children.
她的工作是照料孩子们。
He seems not to look after the children.
他好像不是她的父亲。
She looks to be a young girl of twenty year-old.
她看起来像是一个20岁的年轻姑娘。
He didn’t appear to dislike it.
看不出他憎恨此事。
My advice proved to be wrong.
我的建议证明是错误的。
He will grow to like this work gradually.
他会逐渐喜欢这个工作的。
④能与there连用的系动词有:be, appear, seem.
There appeared to be only one room.
那儿好像只有一个房间。
There seems(to be)no need to go.
似乎没有必要走。

6.能用两种否定形式的系动词有两个:seem, appear.
举例说明:
It doesn’t seem that we can get our money back.= It seems that we can’t get our money back.
He seems not to be her father.= He doesn’t seem to be her father.
The baby doesn’t appear to be awake.= The baby appears not to be awake.

7.后接作表语的过去分词可构成系表结构
能构成系表结构的系动词通常有两个:第一个是常见的be(is, am, was等);第二个是get,口语中常用。
当二者作系动词用时,它们均表示一种存在状态,而不表示被动动作;当二者作助动词用时,后接作谓语的过去分词构成被动语态。
Be + P.P常可以用get + P.P.来代替,但是并不是be系动词总是可以用get来代替。Get + P.P.系表结构常用于以下两种情况:
1)表示偶然的、突发性的、意想不到的被动动作的结果或状态。
Last night I got caught in the downpour.昨夜我被雨淋了(表示意想不到)
The new car got scratched.新车给刮坏了。(表突发性)
2)表示对自身所作的事。如get dressed, get lost等。
John got injured while playing football last Saturday.约翰上周星期六踢足球时受了伤。
They got married last month.他们上个月结婚了。
另外,要注意区分系表结构与被动语态结构的用法。


一般现在时:
:表示通常性、规律性、习惯性的状态或者动作(有时间规律发生的事件)的一种时间状态。
一般现在时的具体用法:
1. 表示经常的或习惯性的动作,常与表示频率的时间状语连用。    
e.g.  I leave home for school at 7:00 every morning. 
2. 表示客观事实和普遍真理。    
e.g.  The earth moves around the sun.
3. 表示现在发生的具体动作或存在的状态 
e.g. He lives in Beijing now.
4. 习惯性的爱好或行为
e.g. I like dancing while she likes singing.
5. 表示预先计划或安排好的行为。 
e.g.  Our class begins at 7:45.
6. 在时间状语从句和条件状语从句中,常用一般现在时代替将来时。 
e.g.  If you come, we will wait for you.
7. 表示格言或警句中。 
e.g.  Pride goes before a fall. 骄者必败。 
8.表示主语具备的性格、能力、特征和状态。 
e.g. I don't want so much. 
Ann Wang writes good English but does not speak well.
比较:Now I put the sugar in the cup. 
  I am doing my homework now.
9.在时间状语从句和条件状语从句中,常用一般现在时代替将来时。 
10.小说故事用一般现在时代替一般过去时。新闻报道类的内容,为了体现其“新鲜”性,也用一般现在时来表示过去发生的事情。 
11.有些表示状态和感觉的动词表示现在发生的具体行为时,只用一般现在时,而不用进行时态。 
注意★:此用法如果出现在宾语从句中,即使主句是过去时,从句谓语也要用一般现在时。 
例:Columbus proved that the earth is round.. 第一句用一般现在时,用于操作演示或指导说明的示范性动作,表示言行的瞬间动作。再如:Now watch me,I switch on the current and stand back. 第二句中的now是进行时的标志,表示正在进行的动作的客观状况,所以后句用一般现在时。
一般现在时与现在进行时的区别:
一、两种时态的主要含义:
一般现在时
1.表示事物的本质特性或客观存在,没有时限性。
The table ____ soft。(feels) 表特性特征。
Japan ___ in the east of China。 (lives) 表客观事实
2.现阶段经常性、习惯性的行为,可带频率时间。
The shop closes at 7:30 p.m.
Father doesn’t smoke. (习惯)
3.表说话时的状态,感觉或结果,一般用状态动词,如:
It doesn’t matter. Does it hurt? (感觉结果)
4.特殊用法:
-在条件、时间、让步从句中用现在时代替将来。
-If you go there,I’ll help you.
—用在begin,come,go,leave,return,open,close 等短暂谓语动词表规定计划。
The plane takes off at 11:30. (不受主观支配的计划)
-在剧本、解说、标题或there(here)开头的句中表进行
There goes the bell/Here comes Mr.Wang.
I declare the meeting opens.(正在宣布)
He meets the ball and hits back to No.2 (正在发生)

现在进行时
1.说话时正在发生,进行的动作
Look! Dark clouds are gathering . (正在发生)
2.表现阶段正在进行,但此刻不一定正在进行的事。
He usually gets up at 6:00,but this week he is getting up at 7:00.
(现阶段正在进行,但说话时不一定在起床)
3.现在进行时的特殊意义
-表示主观打算常用于 go,come,leave,start,begin 等,位移、趋向动词。
How long are you staying here (准备停留)
-表示眼前刚过去的语意即“话音刚落”,适用于tell,say,talk,discuss
You don’t believe it You know I’m telling the truth.
-表示安慰、关心、喜欢、讨厌等感情色彩。
He is always making noises in class. (讨厌)
-在条件、时间、让步状语从句中表示将来正在进行。
Don’t bother him if he is reading this time tomorrow.

二、严格区分进行时与一般时的语义
1. 持续动词的一般时表持续情况,经常性,习惯性行为或客观存在的事实,进行时表暂时性或有限时刻的持续。
2.短暂动词的一般时叙述事实,特征,能力而短暂动作进行时描述反复发生,即将发生或刚开始行为。
3.短暂动词和静态动词一般时表示实际情况客观状态、结果、特征、特性,进行时表未完成含开始或渐进之意。
The bus stops. (车停了-事实)
The bus is stopping. (渐渐停下来)
I love the job. (静态事实)
I am loving the job. ( 渐渐爱上了)
4.come,go,leave,start,return,move,reach,sail,fall 等一般时态表客观规定计划,进行时表主观打算推测。
Flight 254 leaves at 5:30. (表主观打算)
The plane is taking off an hour later.(主观判断)
5.现在进行时带always,often,usually,sometimes,等频率副词表感情色彩,一般现在时则没有此用法。

一般现在时的句子转换:
(1)当句子中有be动词或情态动词时,则把be动词或情态动词(can,could等等)提到主语的前面变成疑问句;在be动词或情态动词后面加not变成否定句.
例:
①陈述句:She is a student.
疑问句→ Is she a student?
否定句→ She is not a student.
②陈述句:I can swim.
疑问句→ Can you swim
否定句→ I can not swim.

(2)当句子中即没有be动词,也没有情态动词时,则在主语前加助动词do (you,以及复数),does(单数she,he,it)变成问句;
在主语后谓语动词前加助动词don’t(I,you,以及复数), doesn’t(单数she,he,it)变成否定句,助动词后的动词要变成动词原形。
例:
①陈述句:We get up at 7:00 every morning.
疑问句→Do you get up at 7:00 every morning?
否定句→We don’t get up at 7:00 every morning.
②陈述句:She has a little brother.
疑问句→ Does she have a little brother?
否定句→ She doesn’t have a little brother.

一般现在时的表达方法:
主要通过谓语动词的变化和用时间词语来表示,其中最主要的是谓语动词的变化。现在一般时动词变化的规则是:
1.如果主语是名词复数和第一人称I、 we ,谓语动词不用做任何变化,即仍然用动词原形表示:
We usually go to school at 7:30. 我们通常7:30上学去。[go]
My parents give ten yuan to my sister every week.我父母每星期给我妹妹十元钱。[give]

2.主语是任何一个单数名词或者是第三人称单数,谓语动词要进行必要的变化。特别提一点:不可数名词也算作单数处理。

3.谓语动词的变化规律是:
第三人称单数的构成见下表:

构成

举例

一般情况

词尾+s

动词原形

第三人称单数

work(工作)
stop(
停止)

works
stops

-ch, -sh, s, x, o结尾

词尾+es

teach()
wash(
)
dress(
装扮)
fix(
安装)
go(
)

teaches
washes
dresses
fixes
goes

辅音字母+y”结尾

yi,再加es

fly(飞翔)
try(
尝试)

flies
tries

特殊变化的词:
be (是) - am,is,are
I am
she/he/it,名词单数都用 is
we,you,they,名词复数都用are
have (有) - have,has
I,we,you,they,名词复数都用have
she/he/it is,名词单数都用 has

助动词,不论单复数、不论什么人称都没有变化,都用 can,may,must,need,ought to 等。
而且,句子中有了助动词,谓语动词就不需要有任何变化了,即用动词原形表示。例:
We have six classes every day. 我们每天上六节课。
I often get up at 6:30. 我经常6:30起床。
Jack likes Chinese food very much.杰克很喜欢中国饮食。
We can see some pictures on the wall. 我们能看到墙上的画。

4.一般现在时常用的时间词语
常用于一般现在时的词语有 sometimes/usually/often/every day(week,year)/ now/always 等。
这些时间词语只是辅助作用,这些词语也可用于其它的时态,所以谓语动词变化才是最关键的。
注意:当表现强烈的感情色彩时,尽管有如 always/never/seldom 等频率副词,但一般在频率副词前加上be动词,后面变为动词的现在分词形式。
例:My father lose his key again. He is always losing his key.


一般现在时的基本结构:


一般现在时中当主语为第三人称单数的时,动词上要改为第三人称单数形式。


一般将来时:
表示将来某一时刻的发生动作或状态,或将来某一段时间内经常的动作或状态。
一般句型有:
肯定句:
I/We shall/will go. You/He/She/They will go.
否定句:
I/We shall/will not go. You/He/She/They will not go.
疑问句:
Shall I/we go? Will you/he/she/they go?
简略回答:
(肯)Yes,主语shall/will (否) No,主语 shall/will not
特殊疑问句:
一般将来时的特殊疑问句是将疑问词放在句首,后接一般疑问句(就主语提问时,以疑问词who开头的疑问词除外)
Why will you be here on Sunday?(周日你为什么将要在这儿?)
I will have a meeting on Sunday(我将要在周日举行一个聚会)
(对特殊疑问句要进行具体回答)
一般疑问句:
be或will提到句首,some改any,and改or,第一二人称互换
We are going to go on an outing this weekend.
Are you going to go on an outing this weekend?
被动句:
will/shall+be+v.ed(及物动词过去分词)
The letter will be sent tomorrow.
这封信明天将寄出去
We shall be punished if we break the rule.
如果我们违反规定,我们将受到惩罚。


一般将来时的构成:
1. 用will或shall表示   
“助动词will或shall+动词原形”这一形式,表示将来发生的事情,用于征求对方的意见或表示客气的邀请。在口语中will用于所有人称,书面语中第一人称常用shall,如:   
①Tomorrow will be Sunday. 明天就是星期天。    
②The rain will stop soon. 雨很快就要停了。    
③Shall we go there at five? 我们五点钟去那儿,好吗?   
④Will you please open the door? 请你把门打开,好吗?   
2. 用be going to结构表示    
“be going to+动词原形”用来表示近期或事先考虑过的将要发生的动作以及已有迹象 表明必将发生某事,意为“打算;就要”。如:    
①We’re going to meet outside the school gate. 我们打算在校门口见面。    
②Look! It's going to rain. 瞧!快下雨了。   
3. 用现在进行时表示   
表示位置转移的动词(如:go, come, leave, start, arrive等),可用现在进行时表示将来时。如:   
①Uncle Wang is coming. 王叔叔就要来了。   
②They’re leaving for Beijing. 他们即将前往北京。   
4. 用一般现在时表示   
根据规定或时间表预计要发生的动作,在时间和条件状语从句中,都可用一般现在时表示将来时。如:   
①The new term starts (begins) on August 29th. 新学期八月二十九日开学。    
②If it doesn’t rain tomorrow, we will go out for a picnic.
如果明天不下雨,我们将出去野餐。   
5. 用“be+动词不定式”或用“be about to +动词原形”的结构表示,如:   
①He is to visit Japan next year. 明年他将访问日本。    
②They’re about to leave. (=They’re leaving.) 他们就要走了。

be going to与will的区别:
be going to与will两者都可表示将要发生的事、将要去做某事,但它们有如下几点区别:
1. be going to 表示近期、将要发生的事情,will 表示的将来的时间则较远一些,如:
He is going to write a letter tonight.
He will write a book one day.
2. be going to 表示根据主观判断将来肯定发生的事情,will表示客观上将来势必发生的事情。
He is seriously ill. He is going to die.
He will be twenty years old.
3. be going to 含有“计划,准备”的意思,而 will 则没有这个意思,如:
She is going to lend us her book.
He will be here in half an hour.
4.在有条件从句的主句中,一般不用 be going to, 而多用will, 如:
If any beasts comes at you, I'll stay with you and help you

shall和will区别:
1.shall和will常常缩写成'll,紧接在主语之后。其否定式 shall not 和will not 的缩写式分别为 shan't 和 won't。
基本句型:
be to表示客观安排或受人指示而做某事。后+动词原形。
be about to+动词原形,意为马上作某事,不能与tomorrow,next week等表示明确将来时的时间状语连用。
2.will和shall在句子中所表达的“意志”是不同的,当句子主语是第一人称(I)的时候表示的是主语 I 的自主“意志”。
例:I will be clear tomorrow . 我会把这件事弄个水落石出
分析:这个句子中用will时,主语 I(我) 就带有强烈的意志,意思是我想让事情水落石出,并且有我会为此付诸努力的意思。
3.当第一人称,用shall的时候就是一个普通的句子,就没有主语的意志。
I shall come back in ten minutes .这句话就是单纯的说 我会在10分钟后回来 没有别的意思
I will come back in ten minutes. 而这句话就有一种意境上的不同。
我会在10分钟后回来,其中的意思还有,就算我有事耽搁了我也会想办法在10分钟后回来的意思
4.shall在第二 、三人称时也和will在第一人称一样。也只有在二三人称才带有意志,只不过shall带有的是“说话者”的意志。而不是主语的意志。
如:he shall be rewarded. 他会得到回报
分析这句话更深度的意思,我说过在shall用在第二三人称时有强烈的“说话者”的意志。
而这句话的“说话者”意志就是 他会得到回报,就算他没有得到回报“说话者”也会想办法让“he”得到回报。


一般现在时的用法:
基本用法:
(1)一般将来时表示将要发生的动作或情况。
例如:I will(shall) arrive tomorrow.我明天到。(主语是第一人称时最好用shall)
Will you be free tonight? 你今晚有空吗?
We won’t (shan’t) be busy this evening. 我们今晚不忙。
(2)在一般将来时的句子中,有时有表示将来时间的状语,有时没有时间状语,这时要从意思上判断是否指未来的动作或情况。
例如:Will she come? 她(会)来吗?
(3)在以第一人称I或we作主语的问句中,一般使用助动词shall,这时或是征求对方的意见(a),或是询问一个情况(b):
a. Where shall we meet? 我们在哪儿碰头?
b. Shall we have any classes tomorrow?明天我们有课吗?
在这类问句中,近几年来也有不少人用will,特别是在美国。例如:
How will I get there? 我怎么去?
(4)be going to+ 动词原形
a.表示计划、打算、准备做的事。例如:
We are going to put up a building here.我们打算在这里盖一座楼。
How are you going to spend your holidays?假期你准备怎样过?
b.表示即将发生或肯定要发生的事。例如:
I think it is going to snow. 我看要下雪了。

其他用法:
一般将来时表示将来某一时刻的动作或状态,其表达形式除了“shall(第一人称),will(第二、三人称)+动词原形构成”外,还有以下几种形式。
一.“be going to+动词原形”表示即将发生的或打算进行的事。例如:
①It is going to rain. 要下雨了。
②We are going to have a meeting today. 今天我们开会。
二.go, come,start,move,sail,leave,arrive,stay,live,fly,等可用进行时态表示按计划即将发生的动作(行进式动词)。
例如:I'm leaving for Beijing.
三.“be to+动词原形”表示按计划要发生的事或征求对方意见。例如:
①Are we to go on with this work?我们继续干吗?
②The boy is to go to school tomorrow.这个男孩明天要去上学。
四.“be about to+动词原形”表示即将发生的动作,意为:很快,马上。后面一般不跟时间状语。例如:
We are about to leave.我们马上就走。
五.某些词,如come, go, leave, arrive, start, get, stay ,live,fly等的一般现在时也可表示将来。
①The meeting starts at five o'clock.会议五点开始。
②He gets off at the next stop.他下一站下车。
六。“be due to"构成的谓语,意味“定于…”也可表示将来时。


主将从现:
主将从现是指在时间状语从句和条件状语从句和让步状语从句中,如果主句是一般将来时,从句用一般现在时替代一般将来时。
主将从现常见的有以下四种情况:
一、时间状语从句的主句是一般将来时,那么从句常常用一般现在时。
如: When I grow up, I’ll be a nurse and look after patients.我长大后要当一名护士,照顾病人。

二、如果主句是祈使句,那么从句通常要用一般现在时
如:Don’t laugh at me when I make a mistake.我犯错误的时候不要笑话我。

三、如果主句是含有情态动词的一般现在时,根据需要从句多用一般现在时
如:You should be quiet when you are in the reading room.在阅览室时应保持安静。

四、 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to....
如:She said not to close the window
常见的时间状语从句的连词有:as soon as,when,while ,as,until等
主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中,如果主句的时态是一般将来时,那么从句要用一般现在时。例如:
I will tell him about it when he comes.
If it is fine tomorrow, we will go outing.
如果主句的时态是过去将来时,那么从句要用一般过去时。例如:
He said that he would have another try if he had the chance.
I knew he could help me if he was free the next day.
主要标志有:if 、unless 、until、 when 、as soon as
宾语从句:
在句子中起宾语作用的从句叫做宾语从句。
宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句。
宾语从句连接代词主要有:
who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever 等。

宾语从句的特点:
1.宾语从句可以作及物动词、介词及形容词的宾语。
2.宾语从句的语序一律用陈述句语序。
3.连接词that引导宾语从句在句中无词义,不充当句子成份,多数情况下可以省略。
4.whether 和 if 都可引导宾语从句,但 whether后可紧跟or not;whether从句可作介词的宾语。
5.如果从句太长,可以用形式宾语it.

宾语从句的时态:
1.主句是一般现在时,从句根据实际情况使用任何时态。
例句:The headmaster hopes everything goes well.
2.主句是过去时态,从句须用过去时态的某种形式。
例句:She was sorry that she hadn’t finished her work on time.
3.当宾语从句表示的是一个客观真理或者事实时,即使主句是过去时,从句也用一般现在时态。
例句:The teacher told his class that light travels faster than sound.
4. 如果从句的动作发生在主句之前,则从句要用过去完成时态。 

宾语从句的语序:
A. 宾语从句必须用陈述语序。   
False: He is wondering when can he finish this difficult job.   
Right: He is wondering when he can finish this difficult job.
B. 有时候可以用it 作形式宾语,而把真正的宾语从句放在后面。    
Bad: I thought that he could finish this job in just two hours impossible.   
Good: I thought it impossible that he could finish this job in just two hours.  
C. 带有宾语从句的复合句的否定形式一般是否定主句。
Bad: I think he doesn’t like the English teacher.   
Good: I don’t think he likes the English teacher. 
D.  主句一般过去时态,从句也要用过去时态。
False: He wanted to know why he is crying in the corner.   
Right: He wanted to know why he was crying in the corner

宾语从句的否定转移:
主句的谓语动词是think,believe,imagine,suppose,consider,espect,fancy,guess等。
并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致。
I don’t think he will come to my party.而不能说成I think he won’t come to my party.
我认为他不会来我的舞会.
I don’t believe that man is killed by Jim,is he?
我认为那个人不是Jim所杀的,是不是?
如果宾语从句中有某个含有否定意义的形容词或副词,其反义疑问句要用肯定形式。
We find that he never listens to the teacher carefully,does he?
我们发现他从来不仔细听老师讲课,是不是?


宾语从句中引导词的用法比较
在复合句中作主句的宾语,引导词有:
连词:that (that 常可省略),whether, if
代词:who, whose, what ,which
副词:when ,where, how, why 等。

(一)that引导的宾语从句(在非正式场合that可以省略)
1.可跟that从句做宾语的动词有:
say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。
例句:The boy believes that he will travel through space to other planets.
注意事项:当主句谓语动词是 think, believe, suppose, expect 等词,而宾语从句的意思是否定时,常把否定转移至主句表示。
例句:I don’t think it is right for him to treat you like that.

2.在以下情况中that不能省略
a.当句中的动词后接多于两个由that引导的宾语从句时,第一个that可省,但后面的that不可省。
例句:He said (that) you were too young to understand the matter and that he was asked not to tell you.
b.当主句的谓语动词与that宾语从句之间有插入语时,that一般不可省。
例句:Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.
c.当that从句是双宾语中的直接宾语时,that不可省。
例句:I can’t tell him that his mother died.
d.注:许多带复合宾语的句子,that引导的宾语从句经常移到句子后部,而用it作形式宾语。
例句:I find it necessary that we should do the homework on time.

(二)由whether,if 引导的宾语从句
1.由whether(if)引导的宾语从句,实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。
一般说来,在宾语从句中whether与if可以互换使用,但在特殊情况下if与whether是不能互换的。
例句:I wonder whether(if) they will come to our party.

2.只能用whether,不能用if引导的宾语从句
a.在带to的不定式前
例句:We decided whether to walk there.
b.在介词的后面
例句:I’m thinking of whether we should go to see the film.
c.在动词后面的宾语从句时
例句:We discussed whether we had a sports meeting next week
d.直接与or not连用时
例句:I can’t say whether or not thet can come on time.

3.只能用if不能用whether引导的宾语从句
a.if引导条件状语从句,意为“如果”
例句:The students will go on a picnic if it is sunny.
b.if引导否定概念的宾语从句时
例句:He asked if I didn’t come to school yesterday.
c.引导状语从句even if(即使)和as if(好象)时
例句:He talks as if he has known all about it.

if,whether在宾语从句中的区别
a.if和whether在作“是否”解时,引导宾语从句常放在动词know,ask,care,wonder,find out等之后,介词后一般不用if
b.少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether. 
c. whether后可以加or not,但是if不可以.
d.在不定式前只能用whether.
(如:I can’t decide whether to stay. 我不能决定是否留下。)
e.避免歧异时,我们常用whether而不用if.

(三)连接代词和连接副词引导的宾语从句
这样的宾语从句实际上是由特殊疑问句变化而来的,宾语从句要用陈述句语序。
用于这种结构的动词常常是:see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。
1.英语中的连接代词有:who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。
例句:Can you tell me whom you are waiting for?
2.英语中的连接副词有:when,where,why,how,在句中担任状语的成分。
例句:None of us knows where these new parts can be bought.


简化宾语从句常用六法:
方法一:
当主句谓语动词是hope, decide, wish, choose, agree, promise等,
且宾语从句的主语与主句主语一致时,宾语从句可简化为不定式结构。
例如:
Li Ming hopes he will be back very soon.
→Li Ming hopes to be back very soon.
We decided that we would help him.
→We decided to help him.

方法二:当主句谓语动词是know, learn, remember, forget, tell等动词,
且主句主语与从句主语一致时,宾语从句可简化为“疑问词+不定式”结构。例如:
She has forgotten how she can open the window.
→She has forgotten how to open the window.
注:当主句谓语动词是tell, ask, show, teach等动词,
且后带双宾语,从句主语和间接宾语一致时,宾语从句可简化为“疑问词+不定式”结构。例如:
Could you tell me how I can get to the station?
→Could you tell me how to get to the station?

方法三:当主句的谓语动词是order(命令),require(需要)等时,
如果主句和从句的主语不一致,宾语从句可简化为“名词(代词)+不定式”结构。例如:
The headmaster ordered that we should start at once.
→ The headmaster ordered us to start at once.

方法四:某些动词后的宾语从句,可以用介词加动名词(短语)等其他形式简化。例如:
He insisted that he should go with us.
→He insisted on going with us.
The poor boy doesn’t know when and where he was born.
→The poor boy doesn’t know the time and the place of his birth.

方法五:某些动词后面的宾语从句可转化为“宾语+V-ing形式(作宾语补足语)”结构。例如:
Liu Ping found that there was a wallet lying on the ground.
→ Liu Ping found a wallet lying on the ground.

方法六:动词seem后的宾语从句,也可以用不定式(短语)来简化,但句型需要进行适当的变化。例如:
It seemed that the boys were going to win.
→The boys seemed to win.
除上述方法外,还有一些特殊句式的转化。例如:
I found that it was difficult to learn English well.
→I found it difficult to learn English well.
Soon we found that the ground was covered with thick snow.
→Soon we found the ground covered with thick snow.
They found that the box was very heavy.
→They found the box very heavy



状语从句:
指句子用作状语时,起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。
状语从句一般由连词(从属连词)引导,也可以由词组引起。
从句位于句首或句中时通常用逗号与主句隔开,位于句尾时可以不用逗号隔开。
状语从句分类:
1、时间状语从句
常用引导词:
when, as, while, as soon as, while, before, after, since , till, until
特殊引导词:
the minute, the moment, the second, every time, the day,the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when
I didn't realize how special my mother was until I became an adult.
While John was watching TV, his wife was cooking.
The children ran away from the orchard(果园) the moment they saw the guard.
No sooner had I arrived home than it began to rain.
Every time I listen to your advice, I get into trouble.

2、地点状语从句
常用引导词:
where
特殊引导词:
wherever, anywhere, everywhere
Generally, air will be heavily polluted where there are factories.
Wherever you go, you should work hard.

3、原因状语从句
常用引导词:
because, since, as, for
特殊引导词:
seeing that, now that, in that, considering that, given that, considering that, as much as, so much as
My friends dislike me because I'm handsome and successful.
Now that everybody has come, let's begin our conference.
The higher income tax is harmful in that it may discourage people from trying to earn more.
Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.

4、目的状语从句
常用引导词:
so that, in order that
特殊引导词:
lest, in case, for fear that,in the hope that, for the purpose that, to the end that
The boss asked the secretary to hurry up with the letters so that he could sign them.
The teacher raised his voice on purpose that the students in the back could hear more clearly.

5、结果状语从句
常用引导词:
so that, so… that, such … that,
特殊引导词:
such that, to the degree that, to the extent that, to such a degree that,
He got up so early that he caught the first bus.
It's such a good chance that we must not miss it.
To such an degree was he excited that he couldn't sleep last night.

6、条件状语从句
常用引导词:
if, unless,
特殊引导词:
as/so long as, only if, providing/provided that, suppose that, in case that, on condition that
We'll start our project if the president agrees.
You will certainly succeed so long as you keep on trying.
Provided that there is no opposition, we shall hold the meeting here.

7、让步状语从句
常用引导词:
though, although, even if, even though
特殊引导词:
as(用在让步状语从句中必须要倒装),while ( 一般用在句首 ),no matter …, in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whichever
Much as I respect him, I can't agree to his proposal.
尽管我很尊敬他, 我却不同意他的建议。
The old man always enjoys swimming even though the weather is rough.
No matter how hard he tried, she could not change her mind.
He won't listen whatever you may say.

8、比较状语从句
常用引导词:
as(同级比较), than(不同程度的比较)
特殊引导词:
the more … the more … ; just as …, so…; A is to B what /as X is to Y; no … more than; not A so much as B
She is as bad-tempered as her mother.
The house is three times as big as ours.
The more you exercise, the healthier you will be.
Food is to men what oil is to machine. 食物之于人,犹如油之于机器。

9、方式状语从句
常用引导词:
as, as if, how
特殊引导词:
the way
When in Rome, do as the Roman do.
She behaved as if she were the boss.
Sometimes we teach our children the way our parents have taught us.

状语从句用法:
时间状语从句
(1) when引导的时间状语从句
①.when引导的时间状语从句,其动词既可以是延续性动作的动词,也可以是瞬间性动作的动词,而且可以表示主句的动作和从句的动作同时发生,或者从句的动作发生在主句的动作之前。如:
when you apply for a job, you must present your credentials.
当你申请工作时,你必须递交你的有关证件。(同时)
when the students heard the teacher’s footsteps, they all atopped talking.
当学生们听到老师的脚步声时,他们都停止了讲话。(从句动作发生在前)
② when还可表示just then(正在那时,突然)的意思,此时其所引导的从句只放在主句之后。如:
we were about to start when it began to rain.
我们正要动身,突然天下起雨来。
The game had hardly/scarcely/barely begun when it started raining.
比赛刚刚开始就下起雨来。
(2) as引导的时间状语从句
as引导的时间状语从句其动词的动作是延续性的,而且侧重表示主句和从句的动作并相发生:
We were having breakfast as she was combing her hair.
她梳头时我们在吃早饭。
It will warm up a little bit on Sunday as the cold front passes.
寒流一过,星期日就会有点暖意了。
(3) while引导的时间状语从句
while表示“在某一段时间里”或“在……期间”,其所引导的从句的动作是延续性的,并侧重表示和主句的动作同时发生。如:
When the teacher paraphrased the text in English, the students listened attentively and took notes.
当老师用英语解释课文时,学生们聚精会神地听并做着笔记。
I can learn while I work.
我可以边工作边学习。
(4) before引导的时间状语从句
① before“在……之前”
I have finished my dissertation before my supervisor went abroad.
在我的导师出国之前,我已完成了我的学位论文。
I’ll be back before you have left.
你离开之前我就会回来。
② before“……之后才”
It may be many years before we meet again.
可能要过许多年我们才能再见了。
It was three days before I came back.
他三天后才回来。
(5) as soon as/once/directly/the instant等引导的时间状语从句
as soon as 是最常见的表示“一……就”的从属连词,其他连词还有once,directly,immediately,instantly,the instant (that),the minute(that) ,the moment(that)等,它们通常都可与as soon as换用。如:
As soon as we got home, the telephone rang.
我们一到家,电话就响了。
I recognized her immediately I saw her.
我一看见她就认出她来了。
Directly the teacher came in everyone was quiet.
老师一进来,大家就静了下来。
(6) hardly...when/no sooner...than引导的时间状语从句
关联从属连词hardly/barely/scarcely...when和no sooner...than的意思是“刚……就”,它们所引导的从句中的谓语动词通常为过去完成时。如:
He had no sooner (no sooner had he)arrived home than he was asked to start on another journey.
他刚一到家,就又要他出另一次差。
No sooner had the words been spoken than he realized that he should have remained silent.
这些话刚一出口,他就意识到自己应该保持沉默。
(7) since引导的时间状语从句
在含有since引导的时间状语从句的复合句中,从句的谓语动词通常为一般过去时,主句的谓语动词通常为现在完成时、过去完成时和一般现在时:
We’ve never met since we graduated from the college.
大学毕业后我们就再没见过面。
Great changes have taken place since you left.
你走了以后,这里发生了巨大变化。
(8) till/until引导的时间状语从句 till和until同义,作“直到……时(为止)”解,till多用于非正式文体,until多用于句首。如:
Donald will remain in college until(till) he finishes his Ph.D course.
唐纳德将留在学校直到完成他的博士学位课程。
I won’t go with you until(till) I finished my homework.
等我做完作业我才和你一起去。
(9) whenever/each time/every time引导的时间状语从句
whenever在引导时间状语从句时作“每当;每次”解,each time和every time与whenever同义,通常可以与它换用。如:
The roof leaks whenever it rains.
每逢下雨屋顶就漏雨。
Whenever certain chemicals are mixed together,heat is produced.
某些化学物质被混到一起时,就会产生热。
Whenever/ Every time/ Each time I met her, she was studying.
我每次看见她时,她总是在学习。

状语从句 - 地点状语从句
(1) when引导的时间状语从句
从属连词where“在(或到)……的地方”
Where there is a will, there is a way.
有志者事竟成。
Put it where you found it.
把它放在原来的地方。
① where 在地点状语从句中,除指地点外,还可指处境等。如:
He said he was happy where he was.
他说他对自己的处境很满意。
It’s your fault that she is where she is.
她今天落到这个地步都怪你。
② 有时地点状语从句中的某些词可以省略。如:
Fill in the blanks with the given phrases. Change the form where necessary.
用所给的短语填空,必要的地方可以改变其形式。
Avoid structure of this kind where possible.
只要可能,就要避免这种结构。
(2) wherever引导的地点状语从句
从属连词wherever“在(或到)……的各个地方”:
You can go wherever(anywhere) you like these days.
这些天你可以去你想去的地方。
Where (Everywhere) they went, the experts were warmly welcomed.
专家每到一处, 都受到热烈的欢迎。
Sit down wherever you like.
你喜欢坐哪儿就坐哪儿。

状语从句 - 原因状语从句
 (1) because引导的原因状语从句
because表示人们不知道的直接的原因或理由,着重点在从句,其所引导的从句,为全句句意的中心所在。
通常用于回答why引出的疑问句,语气最强,除特别强调外,该从句一般位于主句后面。
I didn’t go abrord with her because I couldn’t afford it.
我没有和她一起出国是因为费用太高。
Don’t scamp your work because you are pressed for time.
不要因为时间仓促而马马虎虎。
(2) as引导的原因状语从句
as引导的原因状语从句所传递的通常是已知信息,从句多位于主句之前,通常可以和since换用。如:
As I didn’t know the way,I asked a policeman.
我不认识路,因而问警察。
As it is snowing, we shall not climb the mountain.
由于在下雪,我们不去爬山了。
(3) since引导的原因状语从句
since引导的原因状语从句所传递的通常是已知信息,从句多位于主句之前,通常可以和as换用。如:
Since traveling by air is much faster,they decided to take a plane.
既然乘飞机旅行快得多,他们就决定坐飞机。
Since you won’t help me ,I’ll ask someone else.
你既然不帮我,那我就请别人帮忙。
(4) now(that)引导的原因状语从句
now(that)“因为;既然”,通常可以和since换用。其中that可省去,用来表示一种新的情况,再加以推论。如:
Now(that) you?蒺ve passed your test you can drive on your own.
你既已考试合格,就可以独自开车了。
I do remember,now (that) you mention it.
你这一提,我倒的确想起来了。
(5) seeing (that)引导的原因状语从句
Seeing (that)“鉴于;由于”,通常用于非正式文体。如:
Seeing (that) the weather is bad,we’ll stay at home.
天气不好,我们还是呆在家里吧。
Seeing that he’ s ill,he’s unlikely to come.
(6) in that引导的原因状语从句
in that“因为;基于……的理由”,可以和because换用,多用于正式文体,它所引导的原因状语从句总是位于主句之后。如:
Advertisement is distinguished from other forms of communication in that the advertiser pays for the message to be delivered.
广告不同于其他交际形式,因为登广告的人要为其所提供的信息付费。
I’m in a slightly awkward position, in that he’s not arriving until 10th.
我的处境有点难堪,因为他要十号才来。

状语从句 - 目的状语从句
 (1) in order that引导的目的状语从句
in order that“为了;以便”。多用于正式文体,通常可以与so that换用。如:
You stopped at Hangzhou in order that they could go around West Lake.
他们在杭州停了下来,以便游览西湖。
The expert spoke slowly in order that everyone should understand.
专家讲得很慢,以便人人听得懂。
(2) so (that)引导的目的状语从句
so that“为了;以便”。so that通常可以与in order that换用,它所引导的目的状语从句总是放在主句之后,在非正式文体中,常省略that。如:
Speak clearly so that they may understand you.
你要讲得清楚,他们才听得懂。
She wanted tea ready at seven so she could be out by eight.
她要七点钟备好茶点,这样她八点以前就可以出门了。
(3) in case/for fear (that)/lest等引导的目的状语从句
in case,for fear(that)和lest这三个从属连词都表示否定目的,意思是“以免”,“以防”。
in case多用于英国英语,它所引导的从句中的谓语动词可以是陈述语气形式,也可以是虚拟语气形式;
for fear(that)引导的从句中的谓语带有may,might,should等情态动词;
lest用于正式文体,它所引导的从句中的谓语动词用虚拟语气形式。如:
Take your umbrella with you,lest it should rain.
带上你的伞,以防下雨。
Take your umbrella in case it rains.
带上你的伞,以防下雨。
He took an umbrella with him for fear that it might rain.
他带了一把伞,以防下雨。
状语从句 - 结果状语从句
(1) so that引导的结果状语从句
① so that引导的结果状语从句只能位于主句之后,中间可以有逗号。如:
Suddenly it began to rain heavily,so that it was almost impossible to carry on driving.
突然下起了大雨,几乎无法继续开车。
Linda phoned me in on arrival so that I know she was safe and sound.
琳达到达后给我打了电话,因而我知道她平安无事。
②“so that”既可引导结果状语从句也可引导目的状语从句。
究竟是引导的结果状语从句还是目的状语从句,除了根据句意来判断外,还可根据结构形式来加以判断。
若从句前有逗号,一般为结果状语从句,如果从句中有情态动词,通常则为目的状语从句。如:
They started out early, so that they didn’t miss the train.
他们早早就出发了,所以没误火车。(结果状语从句)
They started out early so that they would not miss the train.
他们早早出发是为了不误火车。(目的状语从句)
(2) so...that引导的结果状语从句
so...that“如此……以致”,that在非正式文体中可以省略,so后面接形容词或副词。如:
She spoke so fast that nobody could catch what she was saying.
她说话如此之快竟没有人听出来她在讲什么。
There is so little time left that I have to tell you about it latter.
现在剩下的时间不多了,我只好以后再给你讲这件事。
(3) such...that引导的结果状语从句
引导结果状语从句的such...that的具体内容是:such+a/an+形容词+名词+that从句。
其中的名词可以是可数名词的单数或复数,也可以是不可数名词。
such+a/an+形容词+单数名词+that从句可换成so+形容词+a/an+单数名词+that从句。如:
The Japanese student made such rapid progress that he soon began to write article in Chinese.
那个日本留学生进步很快,不久就开始用中文写文章了。
The professor told us such a funny story that all the students laughed.
(=The professor told us so funny a story that all the students laughed.)
教授讲了个很有趣的故事,(以致于)所有的学生都笑了起来。
(4) such that引导的结果状语从句
such that引导的结果状语从句多用于正式文体,主句为“主—系—表”句型。如:
The force of the explosion was such that it blew out all the windows.
爆炸的力量很大,所有的窗户都被炸掉了。
His anger was such that he lost control of himself.
他气得不能克制自己的感情。

状语从句 - 条件状语从句 
(1) if引导的条件状语从句
if可引导非真实条件状语从句(见“虚拟语气”)和真实条件状语从句。如:
If he said that,he can’t be telling the truth.
如果他说了那样的话,他不可能是说实话。
(2) unless引导的条件状语从句
unless引导的是否定条件状语从句,在意义上相当于if...not,而且语气较强,一般不用于虚拟语气。如:
You’ll be late unless you hurry.
你会迟到的,如果不赶快的话。
(3) if only引导的条件状语从句
if only在引导条件状语从句时意为“只要;如果”。如:
I’ll let you use the car if only you keep it in good condition.
只要你把车保养好,我就让你用。
(4) as/so long as引导的条件状语从句
as/so long as意为“只要;如果”。如:
As long as it doesn’t rain, we can play.
只要不下雨我们就能玩。
(5) provided (that)/providing (that)引导的条件状语从句
provided (that)/providing (that)意为“如果;只要”。如:
I will agree to go provided’ providing (that my expense are paid.)
假如为我负担费用,我就同意去。
Providing you promise not to tell anyone else I’ll explain the secret.
状语从句 - 让步状语从句
(1) although/though引导的让步状语从句
although和though,都作“虽然;尽管”解,通常可以换用,although的语气较重。
如果要强调“但是”语气,可使用yet,still或nevertheless来表示“但是”、“依然”或“然而”之意。
Although they have been talking for a long time, he cannot make her believe him.
虽然和她谈了半天,他还是不能让她信任自己。
(2) even if引导的让步状语从句
even if “即使,纵然”,从句表示的是尚未发生的动作或存在的情况。如:
Even if it rains tomorrow,we won’t change our plan.
即使明天下雨,我们也决不改变计划。
Even if I failed again, I will not give up the experiment.
即使我再次失败,我也决不会放弃实验。
(3) even though引导的让步状语从句
even though“虽然,尽管”,从句所表示的是已经发生的动作或存在的情况,通常可以和although/though换用。如:
Even though I didn’t understand a word,I kept smiling.
即使我一个字也不懂,我还是保持微笑。
Even though you say so,I do not believe it.
即使你这样说,我也不信。
(4) much as引导的让步状语从句
much as“虽然,尽管”,通常可以和although/though换用:
Much as I’d like to,I can’t come.
我虽然很想来,但是来不了。
Much as I admire his courage,I don’t think he acted wisely.
我虽然佩服他的勇气,但我认为他这样做是不聪明的。
(5) while引导的让步状语从句
while“虽然,尽管”,多用于正式文体,通常可换作although/though。如:
While I understand your point of view,I do not share it.
我虽了解你的观点,但不敢苟同。
While I sympathize,I really can’t do very much to help.
虽然我很同情,但我确实帮不了什么忙。
(6) whatever/No matter what引导的让步状语从句
whatever和no matter what用法相同,都作“无论什么”解,后者多用于非正式文体。如:
Whatever/No matter what he says,don’t go.
不管他说什么,你都不要走。
We are determined to fulfill the task,whatever/no matter what happens.
不管发生什么了,我们决心完成任务。
(7) whichever/no matter which引导的让步状语从句
whichever和no matter which用法相同,都作“无论哪个”解,后者多用于非正式文体。如:
Whichever/No matter which you buy, there is a six-month guarantee.
不论你买哪个,都有六个月的保修期。
Whichever/No matter which of the two men had stolen her purseBarbara was determined to find them.
不管这两个人是谁偷了她的钱包,芭芭拉决心找到他们。
(8) whoever/no matter who引导的让步状语从句
whoever和no matter who用法相同,都作“无论谁”解,后者多用于非正式文体。如:
You can’t come in, whoever you are.
不管你是谁,都不能进来。
Whoever/No matter who wants to speak to me on the phone, tell him I’m busy.
不管谁要我接电话, 就说我现在正忙着呢。
(9) whereverno matter where引导的让步状语从句
wherever和no matter where用法相同,都作“无论在(或到)哪里”解,后者多用于非正式文体。如:
Wherever/No matter where you go, I’m Right Here Waiting fo ryou.
无论你到哪里,我都依然在这里等着你。
(10) however/no matter how引导的让步状语从句
however和no matter how用法相同,都作“无论如何……”解,后者多用于非正式文体。
However much you regret doing that, there is nothing you can do about it now.
无论你可能多么懊悔你曾经做过的事,现在也无济于事了。
However high it may be,it can’t reach the sky.
它不论有多高,也高不到天上去。
(11) whenever/no matter when引导的让步状语从句
whenever和no matter when用法相同,都作“无论何时”解,后者多用于非正式文体。如:
Whenever I’m unhappy,he cheers me up.
每当我不高兴时,他就给我鼓劲儿。
(12)(no matter) whether...or引导的让步状语从句
whether...or和no matter whether...or用法相同,都作“不论……还是”解,后者的语气强一些。如:
When It Rains or not, we’re playing football on Sunday.
无论下不下雨,我们星期天一定踢足球。
(13) as引导的让步状语从句
as在引导让步状语从句时作“虽然;尽管”和“即使”解,但是它不位于句首,在它前面的可以是形容词、名词、副词等。如:
Strong as you maybe, you cannot lift it.
虽然你可能很有力气,你却无法把它提起来。
Late as it was, they continued to study.
时间尽管不早了,他们仍继续学习。

状语从句 - 方式状语从句
(1) as引导的方式状语从句
as在引导方式状语从句时意为“以……方式;如同……那样”,从句有时是省略句。如:
Do as I say. 要照我说的做。
I did just as you told me. 我正是照你说的办的。
Air is to man as water is to fish. 空气之于人犹如水之于鱼。
(2) as if/as though引导的方式状语从句
as if和as though的用法相同,都作“好像,仿佛”解。如:
二者引导的状语从句往往用虚拟语气,表示与事实相反。as if比as though更为常用。
但也可用陈述语气,表示所说的情况是事实或实现的可能性较大。如:
They looked at me as if ‘as though I were mad.
他们瞧着我好像我发疯了似的。
They look as if/as though they know each other.
他们看来好像互相认识。

状语从句 - 比较状语从句
(1) as...as 引导的比较状语从句
as...as表示同级比较,主句中用形容词或副词的原级形式,从句常常为省略句。如:
We were as fortunate as them (they were)
我们和他们一样幸运。
I hope she will make as much progress as you (have done).
我希望她将取得和你同样的进步。
(2) not so/as...as 引导的比较状语从句
not so/as...as表示同级比较,主句中用形容词或副词的原级形式,从句常常为省略句。如:
That’s not so/as simple as it sounds.
那件事情不像听起来那么简单。
(3) than引导的比较状语从句
than引导的比较状语从句表示同等比较,主句中用形容词或副词的比较级形式,从句常常为省略句。如:
He has lived here longer than I(has lived).
他在这儿住的时间比我长。
They love the girl than(they love) him.
他们爱这个女孩而不爱他。
(4) the..., the...引导的比较状语从句
The more you listen to English, the easier it becomes.
英语听得越多就越容易。


虚拟语气:
用来表示说话人的主观愿望或假想,而不表示客观存在的事实,所说的是一个条件,不一定是事实,或与事实相反。
虚拟语气通过谓语动词的特殊形式来表示。
初中阶段主要学习在条件句中的虚拟语气。
条件句中的虚拟语气根据不同的时间有三种不同的形式。

时间

条件从句 

主句 

例句 

与现在事实相反

If+主语+过去式(系
动词be多用were)

would
主语+should+V 
could

见①②句

与过去事实相反

If+主语+had+过去分词

Would
主语+should+have+过    
去分词 
could

见③④句

与将来事实相反

过去式    
If+主语+ should+V原 
were to+V

would
主语+should+V 
 could 
 

见⑤⑥句

例句:
① If I were rich, I would travel around the world.
② If I won a million dollars, I would give it to charities.
③ If you had taken my advice, you wouldn’t have failed.
④ If I had known that earlier, I wouldn’t have done it. 
⑤ If he should go to Tsinghua University, he would make full use of his time.
⑥ If he were to come here, he would tell us about it.


虚拟语气误区:
1.混合条件句的主从句时态不会灵活变化;
2.省略if时,句子调整不正确;
3.不会去找意思中的“应该”含义;
4.陷在虚拟中出不来,把真实条件句当成虚拟条件句。

省略虚拟条件:
1.省略连词if
有时可将条件从句的连词if省略,但此时应用倒装句型,即把从句中的were,should,had 等提到句首:
Were I Tom,I would refuse. 如果我是汤姆,我会拒绝。
Should it be necessary,I would go. 假若有必要,我会去的。
Had it not been for the bad weather we would have arrived on time. 若不是天气坏,我们就准时到达了。
【注】
① 若条件从句为否定句,否定词not应置于主语之后,而不能与were,should,had 等缩略成Weren’t,Shouldn’t,Hadn’t而置于句首。
② 有时省略if后提前的had不是助动词:
Had I time,I would come. 假若我有时间,我会来的。(=If I had time…)

2.省略主语和动词be
若主从句主语一致,且谓语部分包含有动词be,通常可将主语和动词be省略:
If repaired earlier,the tractor would not have broken down.
要是早点儿修一下,拖拉机就不会抛锚了。(=If it had been repaired earlier…)

3.省略“it+be”
If necessary,I would send more farmhands to help you.
如果需要的话,我会派更多的人去帮你。(=If it was necessary,…)

4.省略条件从句
这样的省略通常需要借助一定的上下文,即省略条件从句后,所剩下的主句的意思在一定的上下文中意思是清楚的:
I might see her personally. It would be better.
我可以亲自去看她,这样好一些。(=If I saw her personally,it would be better.)

含蓄条件句中
(1) 条件暗含在短语中。如:
We didn’t know his telephone number; otherwise we would have telephoned him.
我们不知道他的电话号码,否则我们就会给他打电话。(暗含条件是otherwise)
Without your help,we wouldn’t have achieved so much.
没有你的帮助,我们不可能取得这么大的成绩。
(暗含条件是介词短语without your help)
But for your help,I would not have succeeded in the experiment.
如果没有你的帮助,我的实验就不会成功。(暗含条件是but for your help)
It would cause great trouble not to lubricate the bearing immediately.
不立即润滑轴承就会引起很大的故障。
(暗含条件是not to lubricate the bearing immediately)
(2) 条件暗含在上下文中。如:
I would not have done it that way.
我是不会那么做的。(可能暗含if I were you)
I was busy that day. Otherwise I would have come to help you.
我那天很忙。否则我会来帮你的。(可能暗含if I hadn’t been so busy.)
You might come to join us in the discussion.
你可以参加我们的讨论。(可能暗含if you wanted to)
I would have bought the DVD player.
我是会买下那台影碟机的。(可能暗含if I had the money)
But for the storm,we should have arrived earlier.
要不是碰到暴雨,我们还会早些到。(可能暗含if it had not been for the storm)。


条件状语从句用法及动词形式:
1、表示与现在事实相反的情况:
从句:If 主语+过去时(Be动词用were)
主句:主语+should/would/could/might+do
eg: 
1.If I were you,I would take an umbrella.
如果我是你,我会带把伞。(事实:我不可能是你)
2.If I knew his telephone number,I would tell you.
如果我知道他的电话号码,我就会告诉你。(事实:不知道)
3.If there were no air or water,there would be no living things on the earth.
如果没有水和空气,地球上就不会有生物。(事实:地球上既有空气也有水)
4.If I had any money with me,I could lend you some.
如果我带钱了,我就会借给你些。(事实:没有带钱)
5.If he studied harder,he might pass the exam.
如果他再努力些,就能通过考试了。(事实:没有努力)
6.she looked at me as if I had been a stranger.
她看我的样子好像我是一个陌生人。(事实:我并非陌生人) 
2、表示与过去事实相反的情况
从句:If 主语+had+done
主句:主语+should/would/could/might+have done
eg:
1.If I had got there earlier,I should/could have met her. 如果我早到那儿,我就会见到她。(事实:去晚了)
2.If he had taken my advice,he would not have made such a mistake. 如果他听我的劝告的话,就不会犯这样的错误了。(事实:没有听我的话)
3、表示对将来情况的主观推测
主句:主语+should+do 
从句:
①if+主语+were to do
②if+主语+should/would/could/might+do
③if+主语+did(动词过去式)/were
eg:
1.If he should come here tomorrow,I would talk to him.
如果他明天来这儿的话,我就跟他谈谈。(事实:来的可能性很小)
2.If there were a heavy snow next Sunday,we would not go skating.
如果下周日下大雪,我们就不能去滑冰了。(事实:下雪可能性很小)
3.If she were to be here next Monday,I would tell her about the matter.
如果她下周一来这儿的话,我就会告诉她这件事的始末。(事实:来的可能性很小)
4、 有时,虚拟条件句中,结果主句和条件从句的谓语动作若不是同时发生时,虚拟语气的形式应作相应的调整。这种条件句叫错综条件句。
①从句的动作与过去事实相反,而主句的动作与现在或现在正在发生的事实不符。
eg:
If I had worked hard at school,I would be an engineer,too.
如果我在学校学习刻苦的话,我现在也会成为一个工程师了
If they had informed us,we would not come here now.
如果他们通知过我们的话,我们现在就不会来这里了。
②从句的动作与现在事实相反,而主句的动作与过去事实不符。如:
If he were free today,we would have sent him to Beijing.
如果他今天有空的话,我们会已经派他去北京了。
If he knew her,he would have greeted her.
要是他认识她的话,他肯定会去问候她了。
5、 当虚拟条件句的谓语动词含有were,should,had时,if可以省略,这时条件从句要用倒装语序,即把were,should,had等词置于句首,这种多用于书面语。eg:
Should he agree to go there,we would send him there.
要是他答应去的话,我们就派他去。
Were she here,she would agree with us.
如果她在这儿的话,她会同意我们的。
Had he learnt about computers,we would have hired him to work here.
如果他懂一些电脑知识的话,我们已经聘用他来这里工作了。
6、非真实条件句中的条件从句有时不表达出来,只暗含在副词、介词短语、上下文或其他方式表示出来,这种句子叫做含蓄条件句,在多数情况下,条件会暗含在短语中,如without…,but for…等  
eg:
But for his help,we would be working now.
要不是他的帮助,我们还会在工作呢。
Without your instruction,I would not have made such great progress.
要是没有你的指导,我不会取得如此大的进步。
We didn't know his telephone number,otherwise we would have telephoned him.
我们不知道他的电话号码,否则我们就会给他打电话。
7、有时,虚拟条件句中,主、从句可以省略其中的一个,来表示说话人的一种强烈的感情。
①省略从句
He would have finished it. 他本该完成了。
You could have passed this exam. 你本能通过这次考试的。
②省略主句
If I were at home now. 要是我现在在家里该多好啊。
If only I had got it. 要是只有我得到它了该多好啊。
8.注意,在虚拟语气的从句中,动词be的过去时态一律用were,不用was。
eg:If I were you,I would go to look for him.
如果我是你,就会去找他。


虚拟语气的其他用法:
1、一想要( desire )
一宁愿( prefer )
一坚持( insist )
二命令( order , command )
三建议( advise , suggest , propose/recommend)
四要求( demand , require , request , ask)中,
无论主句谓语动词为何种时态,从句的谓语动词都用:"should + do"。should可以省略。
eg:
He suggested that we (should) take the teacher's advice.
He insisted that we (should) take the teacher's advice.
He demand that we (should) take the teacher's advice.
He ordered that we (should) take the teacher's advice.
insist 意为“坚持某种动作”才用虚拟语气;意为“坚持某种观点,某个事实”则不用虚拟语气。eg:
He insists he is a student.
他坚持说他是个学生。
这个语句表示的是事实,因此在这个语句中不能使用虚拟语气。
suggest意为“建议”才用虚拟语气,意为“暗示”则不用虚拟语气。
eg:
His face suggests that he looks worried .
他的表情暗含着他很担心。
这个句子本身是事实,因此它就没有用到虚拟语气。
2、表情绪、观点的形容词或名词也要用虚拟语气。如:
necessary、important、impossible、natural、strange、surprising、funny、right、wrong、better、a pity ,the shame ,no wonder等。
句型:It is.......that +主语从句,从句的谓语动词都要用 should+原型或 只用动词原型。
eg:
Do you think it is necessary that he (should)not be sent to Lingbao.
It is strange that such a person should be our friend.
奇怪的是这样一个人会成为我们的朋友。
注:这一点还没有准确的说法,希望善心人能把这点补充完全。
3、 在even if,even though 所引导的让步状语从句中用may/might+动词原形,may/might可以省略,表示与现在相反的情况;
从句用过去完成时,表示与过去相反的情况,类似的词有though/even though/whatever/however/so long as; 主句、从句的结构与if所引导的条件从句结构相同。
eg:
Even if he were here himself,he should not know what to do.
即使他亲自来也不知该怎么办。(事实:他没来)
Nobody could save him even though Hua Tuo should come here.
即使华佗在世也救不了他。(事实:华佗不在世)
4、 在whatever,whichever,whenever,whoever,wherever,however,no matter wh-等引导的让步状语从句中,从句虚拟语气结构为:指现在或将来:may +do。
eg:
We will finish it on time no matter what may happen.
不管发生什么事,我们都要按时完成。
We will find him wherever he may be.
无论他在哪里,我们都要找到他。
I will wait for him no matter how late he may come.
不管他来的多么晚,我都会等他。
指过去:may +have done 。
eg:
You mustn't be proud whatever great progress you may have made.
不管你取得了多么大的进步,你也不能骄傲。
We must respect him no matter what mistakes he may have made.
不管他犯过什么错误,我们必须尊敬他。
5、一般would rather,had rather,would sooner等之后的宾语从句常表示与客观事实不相符的一种愿望,故使用虚拟语气。其虚拟语气的结构为:
过去 had + done 
现在 过去时(be 用were )
将来 过去时(be 用were ) (would rather 将来情况用一般过去时)
eg:
I'd rather you had seen the film yesterday.
我倒想你昨天看过了这场电影。
I'd rather you were here now.
我倒想你现在在这儿。
We'd rather you went here tomorrow.
我们倒想你明天去那儿
注:注意would rather,had rather,would sooner的细微差别,可以百度一下查查。
6、虚拟语气还可用在定语从句中,表示:“早该做某事了”时,定语从句中的谓语动词须用虚拟语气,其虚拟语气的结构为:
It is (high / about) time that + 主语+ 动词的过去式/ should + do(优先使用动词过去式) ,即从句用虚拟过去式。
It is time that I went to pick up my daughter at school.
我该去学校接我的女儿了。
It is high time you should go to work.
你早该上班了。
7、 简单句中的虚拟语气
(1) 说话时,为了表示客气、谦虚、委婉而有礼貌,言语常使用虚拟语气。其虚拟语气的结构形式常为:would / could / might / should +do。
eg:
Would you mind me shutting the door?
你介意我把门关起来吗?
You should always learn this lesson by heart.
你要把这个教训牢记于心。
I should agree with you.
我本该同意你的观点。(委婉的不同意)
(2)表示“祝愿”时,常用may + 主语+ do。
eg:
May you have a good journey!
祝你一路顺风。
May your youth last forever!
祝你青春永驻。
(3)表示强烈的“愿望”、“祝愿”时,常用do。
eg:God bless us. 上帝保佑。
(4)习惯表达中常用的虚拟语气。
① 提出请求或邀请。eg:
Would you like to have a talk with us this evening?
今天晚上来跟我们聊天好吗?
Could I use your bike now?
我可以用一下你的单车吗?
② 陈述自己的观点或看法。eg:
I should be glad to meet you.
见到你我会很高兴。
I would try my best to help you.
我会尽力帮助你。
③提出劝告或建议。eg:
You'd better ask your father first.
你最好先问一问你的父亲。
You should make a full investigation of it first.
你应该先全面调查一番。
④ 提出问题。eg:
Do you think he could get here on time
你认为他能按时来吗?
Do you expect he would tell us the truth?
你期望他会告诉我们真相吗?
⑤表示对过去情况的责备时,常用虚拟语气。其虚拟语气的结构为:情态动词 + have done。
eg:
You should have got here earlier. 你早该到这里了。
You should have returned it to him. 你早该把它还给他了。
8、虚拟语气在方式状语从句的应用。详见百度百科之方式状语从句词条。