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初中三年级英语

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    用所给动词的正确形式填空。
    1. My mother asks me if I _____  (go) to the park.
    2. Why is Lily_____(sit) under the tree? It's time to have class.
    3. My father _____(mend) my bike while my mother was washing clothes.
    4.Tom _____(die) ten years ago, he has been dead for ten years.
    5.I will tell him the good news as soon as he_____(come) back.
    6.Lucy and Lily missed _____(watch) the wonderful film.
    本题信息:2012年同步题英语填空题难度一般 来源:孔建伟
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本试题 “用所给动词的正确形式填空。1. My mother asks me if I _____ (go) to the park.2. Why is Lily_____(sit) under the tree? It's time to have class.3. My f...” 主要考查您对

实义动词的单数第三人称形式

实义动词的过去式

分词

动名词

一般过去时

过去进行时

一般将来时

主语从句

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。
  • 实义动词的单数第三人称形式
  • 实义动词的过去式
  • 分词
  • 动名词
  • 一般过去时
  • 过去进行时
  • 一般将来时
  • 主语从句

在一般现在时的肯定句中,当主语为非第三人称单数时,谓语动词用原形;
当主语为第三人称单数时,谓语动词用单数第三人称形式。


实义动词的一般现在时的单数第三人称形式遵从“s,es, ies”六字母规则。如下表所示:
规则 动词原形 第三人称
单数形式
s 一般在词尾加s(读音规则:
清清浊浊元浊,
在清辅音后读清辅音/s/,
在浊辅音和元音后读/z/)
stop
take
clean
play
grow
stops/s/
takes/s/
cleans/z/
plays/z/
grows/z/
es 以,x,ch,sh,或o结尾的动词
加-es(读/iz/)
pass
fix
wash
watch
do
passes
fixes
washes
watches
does
ies 以辅音字母
加y结尾的动词,变y为ies(读/iz/)
fly
carry
hurry
flies
carries
hurries
实意动词单数第三人称变化规律:

注意:不规则变化的有have—has, be—is, go—goes, do—does

一般现在时,当主语是第三人称单数时,谓语动词要用第三人称单数形式 
主语是第三人称单数有以下几种情况: 

(1) 不可数名词做主语:
Some water is in the glass 

(2) 单个的可数名词做主语:

The girl is Chinese.  My watch is on the dresser. 

(3) He ,she , it 等代词单个做主语: 
He is in the tree. She likes her family very much. 
(4) 单个的人名,地名或称呼作主语:
Mary is a doctor.  Uncle Li speaks a little English.   
Changchun is a beautiful city. 

(5) 指示代词this, that 等作主语:
 This is a pear.  That is an apple . 

(6) Everyone, everything ,something, nobody, nothing.等不定代词作主语时 
Is everyone here today?   Everything is ok . 

(7)单个数字作主语时:
”8” is a good number in China.

动词单数第三人称形式的一般现在时的句子的否定句、疑问句及特殊疑问句。
    

否定句:
在主语的后面实义动词前加
doesnt(注意实义动词应恢复原形。)     

主语(单三)+doesn + 动词原形+其他 

Jim likes football变否定: Jim doesn’t like football             

He has lunch at school. 变否定:He doesn’t have lunch at school.   


一般疑问句及答语,在句子前面加助动词
does. 实义动词恢复原形     

Does +主语(单三)动词原形+其他 

Does your father work ? Yes, he does. /No, he doesn’t    


特殊疑问句:特殊疑问词
+一般疑问句 

特殊疑问词+ does +主语(单三)动词原形+其他         

Where does a bird live ?         

How does she go to school 


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?
分词:
就是具有动词及形容词二者特征的词;尤指以-ing或-ed,-d,-t,-en或-n结尾的英语动词性形容词,具有形容词功能,同时又表现各种动词性特点,
如时态,语态、带状语性修饰语的性能及带宾语的性能。
分词分为现在分词和过去分词两种,是一种非谓语动词形式。
现在分词和过去分词主要差别在于:
现在分词表示"主动和进行",过去分词表示"被动和完成"(不及物动词的过去分词不表示被动,只表示完成)。
分词可以有自己的状语、宾语或逻辑主语等。

现在分词构成形式:
①一般在动词原形末尾加ing,如do→doing、sing→singing、comfort→comforting
②以不发音的e、ue结尾的动词,先去e,再加ing,如dance→dancing、hike→hiking、write→writing、make→ making,take→taking
③以ee、oe、ye结尾的动词加ing,如see→seeing、toe→toeing、dye→dyeing
④以重读闭音节结尾的动词,并且末尾只有一个辅音字母,应双写这一字母,再加ing,如cut→cutting、swim→swimming
注:结尾是x则不必双写,如relax→relaxing
⑤以ie结尾的动词,要把ie变成y再加ing,如die→dying,lie→lying.
⑥以ic结尾的动词,要把ic变成ick再加ing,如picnic→picnicking,traffic→trafficking

过去分词构成形式:
1.规则动词:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则:
(1)、一般动词,在词尾直接加“ ed ”。(然而要注意的是,过去分词并不是过去式)
work---worked---worked ,  visit---visited---visited
(2)、以不发音的“ e ” 结尾的动词,只在词尾加“ d ”。
live---lived---lived
(3)、以“辅音字母 + y ”结尾的动词,将 "y" 变为 "i" ,再加“ ed ”。
study---studied---studied,cry---cried---cried,try---tried---tried,fry---fried---fried.[1]
(4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“ ed ”。
stop---stopped---stopped  ,  drop---dropped--dropped
(5)、以ic结尾的动词,要把ic变成ick再加ed,
picnic→picnicked  ,traffic→trafficked
2 、不规则动词:见不规则动词表


分词用法:
1、分词作状语   
分词在句子中作状语,可以表示时间、条件、原因、结果、让步、伴随等。   
分词(短语)作状语时,其逻辑主语应与句中主语相一致。
当现在分词表示的动作发 生在谓语动词之前时, 则用现在分词的完成式,且所表示动作与谓语动作同时发生, 则用现在分词的一般式。
完成或被动关系用过去分词。   
①现在分词:
The students went out of the classroom, laughing and talking.   
②过去分词:
Accompanied by his friend, he went to the railway station. 
Given   better attention, the plants could grow better.   

2、“while ( when, once, until, if , though等连词)+分词”结构   
现在分词或过去分词作状语时,有时可以在分词前加while,when, once, although, until, if等连词。   
①现在分词:
When leaving the airport, she waved again and again to us.
While waiting for  the train, I had a long talk with my sister about her work……   
②过去分词:
Once recovered, he threw himself into his work and made every effort to do it  well.   
Although working very hard, he failed to pass the final exam. If translated word by word, the passage will be difficult to understand.   

3、分词作定语   
分词作定语时,单个的分词通常放在被修饰的名词之前,分词短语一般置于所修饰的中心词后面。
现在分词修饰的是发出该动作的名词(即与名词有主谓关系),过去分词修饰承受该动作的名词(即与名词是动宾关系)。    
We will go on with our experiment as soon as we get the added fund.    
This is really an exhausting day to all of us!   
We can see the part of the moon lighted by sunlight.   
After a night spent in excitement and sleeplessness, I forced myself to take a long walk along the beach the next day.   
More and more developing countries established strategic partnership with  developed countries   

4、分词作宾语补足语   
现在分词在see, watch, hear, observe, notice, feel, find, glimpse, glance等感官动词和look at, listen to等短语动词以及
have, keep, get, catch, leave, set, start, send等使役动词后面与名词或代词构成复合宾语,作宾语补语的成分。
例:I see him passing my house every day.
I caught him stealing things in that shop.
I smelt something burning.

5、分词作表语
分词作表语通常看作形容词来用。
过去分词表示主语的感受或状态,主语多为人。现在分词表示主语的性质,而且主语多为物;
①过去分词:
We were so bored that we couldn’t help yawning.
She felt confused, and even frightened.
②现在分词:
He was very amusing.
That book was rather boring.
很多动词的现在分词都可以作表语:
exciting, interesting, encouraging, disappointing, confusing, touching, puzzling.


动名词:
如果一个动词加上了ing变成了名词,那么这个词称动名词。 动名词是一种兼有动词和名词特征的非限定动词。
它可以支配宾语,也能被副词修饰。
由于动名词是由动词变化而来,它仍保留着动词的某些特征,具有动词的某些变化形式,用以表达名词所不能表达的较为复杂的意念。
动名词的名词特征表现在它可在句子中当名词来用,作主语、宾语、表语、定语。

动名词的结构和形式:
动名词的否定结构:
动名词的否定结构由not 动名词组成。如:
Trying without success is better than not trying at all. 实验没有成功也比不实验好。
He hated himself for not having work hard. 他悔恨自己没有用功。
I’m sorry for not having telephoned you before. 很抱歉,没有早给你打电话。
He felt sorry for not having done the work well. 他为没有把工作做好感到难过。
I fancy it has done you a lot of good not going. 我看不去对你倒好了。
(not going 是动名词一般式的否定形式)
There is no denying the fact that he si diligent.
(no denying 也是动名词一般式的否定)

动名词复合结构:
通常情况下,动名词的逻辑主语为谓语动词的主语。如果动名词动作的发出者不失谓语动的主语时,则需要有自己的逻辑主语物主代词或名词所有格加动名词就构成了动名词的复合结构,这种结构在句中可以作主语,宾语等。
(1)逻辑主语是有生命的名词作主语时,必须用名词或代词所有格,作宾语时(尤其在口语中),也可用名词普通个或人称代词宾格。如:
Do you think my going there will be of any help?
你看我去会有什么帮助吗?(宾语)
The student’s knowing English well helps him in learning French.
这位学生通晓英语对他学法语很有帮助。(主语)
Do you mind my(me) smoking ? 你介意我抽烟吗?(宾语)
They insist on Mary’s (Mary) going with them there.
他们坚持要玛丽跟他们一起去那儿。(介词宾语)
(2)逻辑主语是无生命名词是,通常只用名词普通格。如:
Do you hear the rain pattering on the roof?
你听见雨点打在屋顶上了吗?
Is there any hope of our team winning the match ?
我们对赢得比赛有希望吗?
(3) 逻辑主语是指示代词或不定代词this that , somebody , someone , nobody, none, anybody, anyone 时,只用普通格。如:
She was woken up by somebody shouting outside.
她被外面喊叫的人吵醒了。

动名词的形式(一般式,完成式和被动式):
(1) 动名词的一般式所表示的动作与谓语动词所表示的动作同时发生,或在谓语动词表示的动作之后。如:
We are very interested in collecting stamps. 我们对集邮很感兴趣。
His coming will be of great help to us . 他来对我们大有帮助。
但是有些明确表示时间的动词和介词 after, on,upon, 或for之后,常用一般式代替完成式,表示动作发生在谓语动作之前。如:
I shall never forget seeing the Great Wall for the first time.我永远不会忘记第一次看到长城的情景。
On hearing that bad news , the mother couldn’t help crying. 一听到这个糟糕的消息,母亲就禁不住哭了起来。
Excuse me for coming late. 我来晚了,请原谅。
Thank you for giving us so much help. 谢谢你给了我们这么多帮助。
(2) 动名词的完成式所表示的动作或状态在谓语动词之前完成或结束。
He regrets not having taken part in the work. 他后悔没有参加这项工作。
We were praised for having finished the work ahead of time. 我们因提前完成了这项工作而受到了表扬。
(3)动名词的被动式:当动名词的逻辑主语是行为承受者时,用被动语态。如:
I like being given harder work. 我喜欢接受难点的工作。
She is proud of being admitted into the university. 她为被大学录取而感到自豪。
The meeting was put off without his having been consulted. 会议延期并未和他商量。
He doesn’t mind having been criticized. 他不介意过去受到的批评。


动名词与现在分词的关系:
动名词它在形式上与现在分词相同,都是在动词原形的词末加-ing。在现代语法中,这两种形式同视为"-ing形式"。
这两种形式的另一个相同之处是:
它们都是由动词变化而成的,它们都保留了动词的某些特征,它们都能带自己的宾语、状语,而构成动名词短语或是现在分词短语去担当句子成分。
例如:
Speaking in the public,he will surely be very cheerful .
(现在分词短语,作状语)他在公众场所讲话时总是兴高采烈的。
She hates speaking in the public.
(动名词短语,作宾语)她不喜欢在公众场所讲话。

动名词和现在分词都可以用于系动词之后作表语,区别方法是:
①作表语的动名词与主语指的是同一件事,此时系动词相当于“是”,通常把主语和表语的位置互换,语法和意思不变,例如:
My hobby is swimming.可改为Swimming is my hobby.(可将原句中的主语与表语位置互换)
②现在分词作表语主要用以说明主语的性质,不能与主语互换位置,例如:
The story is interesting .不可改为:Interesting is the story.
2.动名词和现在分词都可以用作定语来修饰名词,两者的区别在于:
动名词修饰名词时主要表示该名词的用途,而现在分词修饰名词时性质、状态或动作等。试比较:
①a swimming boy和a swimming suit
前者的意思是“一个正在游泳的男孩”,即a boy who is swimming,现在分词swimming 表示被修饰名词boy的动作;
而后者的意思是“游泳衣”,即a suit for swimming,动名词swimming表示suit 的用途。
②a sleeping child 和 a sleeping car
前者的意思是“一个正在睡觉的孩子”,即a child who is sleeping,现在分词sleeping 表示被修饰名词 child 正处于的状态;
而后者的意思是“卧车(被用来睡觉的车厢)”,即 a car which is used for sleeping,动名词 sleeping 表示car 的用途。


动名词用法口诀:
动名词常泛指,句法作用宾/表/定与主,时态/语态之形式,一般/完成/被动式。
Being done 系被动,不含任何进行意。用作主语请留意,常用it作形式主语,不指未来发生事,表达的信息系已知。
用作表语请记清,作用相当一名词,检验方法很简单,主与表换位能成立。
用作定语也易辩,表示名词之用途。
用作宾语稍复杂,关键留意谓语动词(跟动名词作宾语的常用动词附后),时态同谓动作比较,先于谓动用完成式,其逻辑主语不固定,在句中/句外均有之。
否定式其前加not,复合式其前加物主词,非句首宾格词也可用,尤其口语中更如此。
说明:1、主-----主语 2、宾-----宾语 3、表------表语 4、定------定语 5、谓动---谓语动词

动名词的用法:
一、动名词作主语 
1. 直接位于句首做主语。例如:   
     Swimming is a good sport in summer.   
2. 用 it 作形式主语,把动名词(真实主语)置于句尾作后置主语。   
动名词做主语时,不太常用 it 作先行主语,多见于某些形容词及名词之后。例如:
It is no use telling him not to worry.   
常见的能用于这种结构的形容词还有:better,wonderful,enjoyable,interesting,foolish,difficult,useless,senseless,worthwhile,等。   
注意:important,essential,necessary 等形容词不能用于上述结构。   
3. 用于“There be”结构中。例如:   
There is no saying when he'll come.很难说他何时回来。    
4. 用于布告形式的省略结构中。例如:   
No smoking ( =No smoking is allowed (here) ). (禁止吸烟)   
No parking. (禁止停车)   
5. 动名词的复合结构作主语   
当动名词有自己的逻辑主语时,常可以在前面加上一个名词或代词的所有格,构成动名词的复合结构
(这时,名词或代词的所有格做动名词的逻辑主语)。
动名词的复合结构也可以在句中作主语。例如:    
Their coming to help was a great encouragement to us.   

二、动名词作宾语
1.作动词的宾语   
某些动词后出现非限定性动词时只能用动名词作宾语,不能用不定式。常见的此类动词有:
admit, appreciate, excuse, stand, advise, allow, permit, avoid,  consider, enjoy, finish     
They went on walking and never stopped talking.他们继续走,说个不停。 
I found it pleasant walking along the seashore.在海滩上走真是乐事。   
Mark often attempts to escape being fined whenever he breaks traffic  regulations.   
每当马克违反交通规则时,他常常企图逃避罚款的处分。    
2.作介词的宾语   
We are thinking of making a new plan for the next term. 我们正考虑为下学期制定新的计划。   
Shall we have a rest or get down to doing our work? 我们休息呢还是开始干活?   
3.作形容词的宾语   
The music is well worth listening to more than once.  这种曲子很值得多听几遍。   
We are busy preparing for the coming sports meet. 我们正为马上到来的运动会忙着做准备。

三、动名词作表语
动名词作表语时句子主语常是表示无生命的事物的名词或what引导的名词性从句。
表语、动名词与主语通常是对等的关系,表示主语的内容,主语、表语可互换位置。   
Your task is cleaning the windows.   你的任务就是擦窗户。
(Cleaning the windows is your task.)   
What I hate most is being laughed at.  我最痛恨的就是被别人嘲笑。
(Being laughed at is what I hate most.)

四、动名词作定语
动名词作定语往往表示被修饰词的某种用途。如:   
a walking stick =a stick for walking=a stick which is used for walking   
a washing machine=a machine for washing=a machine which is used for washing    
a reading room=a room for reading=a room which is used for reading   
a measuring tape=a tape for measuring=a tape which is used for measuring   
sleeping pills=pills for sleeping=pills which is used for sleeping


动名词是非限定动词的一种形式,由动词原形+ing构成。它既有动词的特征,又有名词的特征,故称。
动名词也有时态和语态的变化,如表所示(以及物动词write为例),不及物动词没有语态的变化。
时态、语态 主动 被动
一般式 writing being  written
完成式
having written
having been written

动名词使用注意事项:
1) 动名词做主语时,谓语动词为单数
2) 在动名词和不定式中,作为介词的宾语是动名词
3) 动名词的否定直接在其前加否定词,通过代词的宾格或所有格形式给出逻辑主语
例:I would appreciate you calling back this afternoon.
4) 有些词后只能接动名词
acknowledge;admit; advise;advocate;allow;appreciate; avoid; celebrate; consider; contemplate; defer; delay; deny;
detest; discontinue; dislike; dispute; enjoy; it entails; escape; excuse; explain; fancy; feel like; finish; forgive; can’t help;
hinder; imagine; it involves; keep; it means; mention; mind; miss; it necessitates; pardon; postpone; practice; prevent;
recall; report; resent; resist; risk; suggest; understand...
5) 另外还有一些接-ing形式的常用说法
it’s no good; it’s no/little/hardly any/ use; it’s not/hardly/scarcely use; it’s worthwhile; spend money/time; there’s no;
there’s no point in; there’s nothing worse than; what’s the use/point
6) 有些词后面加不定式和动名词均可
remember,forget,try,stop,go on,continue,stop,regret,cease,mean后面均可用不定式和-ing形式,但意义截然不容。
例:remember to do/doing:
①I remembered to post the letters.(指未来/过去未来将要做的动作)
②I remembered posting/having posted the letters.(我记得做过这个动作)
 forget与remember的用法类似。
 regret的用法:
①I regret to inform you that…(我很遗憾地通知你……)
②I regretted having left the firm after twenty years.(为了“二十年前的离开”而遗憾。)
 try to(努力)与try +–ing(试验):
①You really must try to overcome your shyness.
②Try practicing five hours a day.
一般过去时:
表示过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为;过去主语所具备的能力和性格。
基本结构:
主语+动词过去式+其他;
否定形式①was/were+not;②在行为动词前加didn't,同时还原行为动词;
一般疑问句Did+主语+do+其他。
一般过去时句法结构:
肯定形式
主语+动词过去式+其他
例句:She often came to help us in those days.
否定形式
①was/were+not;②在行为动词前加didn't,同时还原行为动词
例句:I didn't know you like coffee
一般疑问句
①Did+主语+do+其他? ②WasWere+主语+表语?
例句:Did I do that?
用表格整理如下:
肯定式 疑问式 否定式 疑问否定式
Iworked Did I work? I did not work Did I not work?
He(She,It) worked Did he(she,it) work? He(she,it) did not work Did he(she,it) notwork?
We worked Did we work? We did not work Did we not work?
You worked Did you work? You did not work Did you not work?
They worked Did they work? They did not work Did they not work?
记忆口诀:
一般过去时并不难,过去动作、状态记心间。
动词要用过去式,时间状语句末站。
否定句很简单,didn't 站在动原前,其它部分不要变。
一般疑问句也好变,did放在句子前,主语、动原、其它部分依次站。
特殊疑问句也简单,疑问词加一般疑问句记心间。
最后一条请注意,动词过去式要牢记!

一般过去时中动词过去式变化规则:

构成

举例

一般情况

词尾+ed

动词原形

过去式和过去分词

look
talk

looked
talked

以不发音字母e结尾

词尾+d

like
arrive

liked
arrived

以“辅以字母+y”结尾

变y为i,再加ed

fly
study

flied
studied

以重读闭音节结尾,且末尾只有一个辅音字母

双写词尾+ed

stop
plan

stopped
planned 


结构句型:

1.一般句子
I watched TV last night.
2.一般疑问句
Did you watch TV last night?
3.there be 句型
There was an apple on the table last night.
Was there an apple on the table last night
一般过去时注意事项:
1.注意主句与从句中时态的一致性
如果主句用了过去时,从句中一般也要用过去式,或者过去进行时、过去完成时等。例如:
He believed that he was right. 他相信自己是对的。
I didn’t know you were here. 我不知道你在这儿。
I thought they were with you. 我以为他们和你在一起。

2.在口语中, 一般过去时并不一定指真正的过去,而只是表示一种礼貌性语气。例如:
I wondered (wonder) if you could do me a favor. 不知你可否帮我一个忙。
I wanted (want) to ask if I could borrow your car. 我想问问可否借用你的车。
I hoped (hope) you could (can) give me some advice. 我希望你能帮我出点主意。
Did (Do) you want to see me? 你想见我吗?

3.used to
used to 是一个词组,表示“过去曾经是……而现在已经停止了”的动作。例如:
I used to work fourteen hours a day. 我过去常常一天干十四个小时。(而现在不这样了)
I used to take a walk in the morning.我过去是在早晨散步。(而现在不在早晨散步了)
一般过去式用法:
(1)一般过去时表示在过去某个特定时间发生,也可以表示过去习惯性、经常性的动作。
一般过去时不强调动作对现在的影响,只说明过去的事情。
句式:主语+动词过去式+宾语+其它
I had a word with Julia this morning.今天早晨,我跟茱莉雅说了几句话。
He smoked many cigarettes a day until he gave up. 他没有戒烟的那阵子,抽烟抽得可凶了。

(2) 一般过去时常与表示过去的时间状语或从句连用,如:
yesterday,last week ,in  the  past ,in 1993,at that time,once,during the war,before,a few days ago,when 等等.
(句子中谓语动词是用一般过去时还是用现在完成时,取决于动作是否对现在有影响)。
Have you had your lunch? 你吃过午饭了吗?(你现在不饿吗?)
Yes,I have. 是的,我已经吃过了。(已经吃饱了,不想再吃了。)
When did you have it? 你是什么时候吃的?(关心的是吃的动作发生在何时。)
I had it about ten minutes ago. 我大约是十分钟以前吃的。)
Used to do something 表示过去常做而现在已经停止了的习惯动作。
I used to work fourteen hours a day. 我过去常常一天干十四个小时。
I ate it at 6:45。我在六点四十五分吃了。

(3)带有确定的过去时间状语时,要用过去时。如:
yesterday(昨天)、two days ago…(两天前…… )、last year…(去年…)、the other day(前几天)、
once upon a time(很久以前)、 just now(刚才)、in the old days(过去的日子里)、before liberation(解放前…)、
When I was 8 years old(当我八岁时…)、at+一个时间点
Did you have a party the other day?前几天,你们开了晚会了吗?
Lei Feng was a good soldier.雷锋是个好战士。
注:在谈到已死去的人的情况时,多用过去时。

(4)表示过去连续发生的动作时,要用过去时。这种情况下,往往没有表示过去的时间状语,而通过上下文来表示。
The boy opened his eyes for a moment,looked at the captain,and then died.
那男孩把眼睛张开了一会儿,看看船长,然后就去世了。

(5)表示过去一段时间内经常或反复的动作。常与always,never等连用。
Mrs. Peter always carried an umbrella.彼得太太过去老是带着一把伞。
(只是说明她过去的动作,不表明她现在是否常带着伞。)
比较:
Mrs. Peter always carries an umbrella.彼得太太老是带着伞。
(说明这是她的习惯,表明她现在仍然还习惯总带着一把伞)
Mrs. Peter is always carrying an umbrella.彼得太太 总是带着一把伞。
(表示说话者对这一动作或行为厌烦)
I never drank wine.我以前从不喝酒。
(不涉及到现在,不说明现在是否喝酒)

(6)如果强调已经终止的习惯时要用 used to do(过去常常做,而现在不那样做了)
He used to drink alcohol.他过去喝酒。
(意味着他现在不喝酒了。喝酒这个动作终止了)
I used to take a walk in the morning.我过去是在早晨散步。
(意味着现在不在早晨散步了)
比较:
I took a walk in the morning.我曾经在早晨散过步。
(只是说明过去这一动作)

(7)有些句子,虽然没有表示过去确定时间的状语,但实际上是指过去发生的动作或存在的状态的话,也要用过去时。
I didn''t know you were in Paris.我不知道你在巴黎。
(因为在说话时,我已经知道你在巴黎了。这句话指的是说话之前,所以只能用过去时表示。实际上,这句话暗指:But now I know you are here.)
I thought you were ill.我以为你病了呢。
(这句话应是在说话之前,我以为你病了。但是现在我知道你没病)
一般过去时三变技巧:
一变:肯定句变为否定句
技巧1.当句中含有情态动词或助动词could,would,should等时,可直接在其后面加not构成否定句。例如:
I could get you a concert ticket. → I could not / couldn't get you a concert ticket.
技巧2.当句中含有系动词was,were 时,可直接在其后加not构成否定句。例如:
I was on the Internet when you called me. → I was not / wasn't on the Internet when you called me.
技巧3.当句中谓语是除情态动词、助动词、系动词was, were以外的动词时,在该动词之前加did not / didn't,动词还原,构成否定句。例如:
The famous singer sang some Chinese songs. → The famous singer did not / didn't sing any Chinese songs.

二变:陈述句变为一般疑问句
技巧1.移动词语的位置。将was,were, could,would,should等移到句首。例如:
He could pack his things himself. → Could he pack his things himself?
技巧2.添加助动词did。谓语是除情态动词、助动词、系动词was, were以外的动词时,在主语之前加did,动词还原。例如:
Mr Li looked very old. → Did Mr Li look very old?

三变:陈述句变为特殊疑问句
技巧1.确定疑问词:人who / whom,物what,地点where,时间when / what time,原因why,频率how often,长度how long,距离how far等等。例如:
They gave the concert last night. → When did they give the concert?
技巧2.辨认结构形式:疑问词+情态动词/助动词/ was / were / did +主语+...? 例如:
The accident happened near the station. → Where did the accident happen?
过去进行时:
表示在过去某一时刻或某一段时间内进行或发生的动作。其形式为was/were+V-ing。
常与表示过去的时间状语连用,如:
last night,last Saturday等;
或者与when,while,as引导的过去时间状语连用。
过去进行时的结构:
1. 过去进行时由“主语+was/were + 现在分词”构成
eg: We were having supper when the phone rang. 我们正在吃晚饭时电话响了。
2. 过去进行时的否定式由“主语+was/were not +现在分词”构成
eg: This time yesterday Jack was not watching TV. He was repairing his bike. 昨天这个时候,杰克不是在看电视,而是在修理自行车。
3. 过去进行时的疑问式由“was/were +主语+ 现在分词”组成
eg: Were you playing basketball at four yesterday afternoon? 你们在干什么昨天下午的时间啊  回答我啊?

过去进行时和一般过去时的区别:
一、二者概念理解
一般过去时叙述旧事,过去进行时描述背景。
A、一般过去时
1.过去状态、动作或事件
He went to Beijing the other day.(带具体时间)
2.过去的习惯
a would ,used to与过去时
would 表间断性不规则的习惯,常带频率时间
used to 表一贯性有规律的习惯
They used to meet and would sometimes exchange one or two words.
He smoked a lot two years ago. (过去行为)
bWould 用于文中不用于句首,只表过去习惯。
Used to 表今昔对比的含义,叙述习惯动作可与would 换用。
When he was a boy , he would often go there . (叙述过去)
She isn't what she used to be. (今昔对比)
c 表示状态时一般只用used to
Tom used to be fat /There used to stand a tree there. (状态)
dwas (were) used to +ving表示“合适于,适应于…..”
He used to work at night . (“习惯”表经常)
He was used to working at night. (习惯表适应)
3.过去的经历,平行动作,依此事件用一般过去时。
He sat there and listened to the radio.(依此发生)
4.客气委婉的语气,用于情态动词,助动词和want , wonder , hope 等
How did you like the film? / Could you help me?

B. 过去进行时
1.在过去某阶段或某一时刻正在发生
What were you doing at 8:30 last night? (过去某时刻正在发生)
2.性动词用过去进行时表示按计划、打算
During that time he was going with us.(表示打算)
3.lways ,often ,usually 等连用表喜爱,讨厌等感情色彩。
He was always Changing his mind.

二、区别
A. 进行时表某一行为的“片断”一般时表示行为的“整体”和存在的状态。
I was reading the book at that time. (未读完,“读”的片段)
I read the book yesterday. (已读完,表整个“读”)
B、一般持续时间状语多与进行时连用
It was raining all night.(优先用was raining ,rained 为持续动词,故也可使用)
He was writing a letter the whole of afternoon. (短暂动词与持续时间连用,表反复,连续发生,不可用一般过去时)
C、while 时间状语从句中用短暂动词时只能用进行时。
例:He broke a chair while he was jumping up and down.
D、While 所在主从句动作大致持续相等时主从句一般都用进行时,但若是持续动词可都用一般过去时,两个动作一长一短时短的用一般时,长的用进行时。
I was cooking the dinner while he was playing the piano.(平行)
I cooked the dinner while he played the piano.
I saw him while I was walking to the station.


过去进行时的基本用法:
过去进行时的基本用法主要表示过去某一时间正在进行的动作。如:
He fell asleep when he was reading. 他看书时睡着了。   
2. 用过去进行时表示现在主要是为了使语气委婉、客气。如:
I was wondering if you could give me a lift. 我不知你能否让我搭一下车。   
【注】一般过去时也有类似用法,但比较而言,用过去进行时显得更客气,更不肯定。   
3. 过去进行时表示感情色彩与现在进行时相似,过去进行时也可表示满意、称赞、惊讶、 
厌恶等感情色彩,也通常与 always, forever, continually等副词连用。如:
They were always quarrelling. 他们老是吵架。   
4. 动词be的过去进行时动词be的进行时也可表示过去一时的表现或暂时的状态。   
比较:He was friendly. 他很友好。(指过去长期如此)   
   He was being friendly. 他当时显得很友好。(指当时一时的表现)

特殊用法

1、当句子意思很清楚时,我们也可以把两个动词都换成一般过去时
We listened carefully when the teacher read the text. 老师读课文时,我们都仔细地听着。
2、表示按计划、安排过去将要发生的事。
用于come,go,leave,start,arrive等表示位置转移的动词时,也可以用过去进行时表示过去将要发生的动作。
如:He told me that he was going soon. 他告诉我他很快就要走了。
3、表示故事发生的背景。
It was snowing as the medical team made its way to the front.
那支医疗小组往前线行进时,天正下着雪。
4、表示一个新的动作刚刚开始。
过去进行时可用来引出一个新的动作,这种用法颇有点儿像镜头转换。
Five minutes later,he stood in the doorway smoking a cigarette.
5分钟后,他已站在门口抽着烟。
5、过去进行时还可和when结构遥相呼应,含有意外之意。
I was walking in the street when someone called me.
我正在街上走时突然有人喊我。
6、用来陈述原因或用作借口。
She went to the doctor yesterday. She was having a lot of trouble with her heart.
她昨天去看病了。她患了很严重的心脏病。
7、与always,constantly等词连用,表示感情色彩。
The girl was always changing her mind.
这女孩老是改变主意。


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
主语从句:
在复合句中充当主语成分的句子叫做主语从句。常规主语从句,即句子在复合句中充当一个主语。 主语从句的时态:不受主句的时态影响和限制。 
例如:
That he finished writing the composition in such a short time surprised  us all. 
What we need is time. 
It is certain that he will win the match. 
(1) 引导主语从句连词有that,whether,who,what,whatever等    
(2) 连词位于句首不能省略    
(3) 主语从句大多数情况下视为第三人称单数

主语从句引导词:
1、由连词that引导的主语从句。
例如:That you will win the medal seems unlikely.
你想获得奖牌看起来是不可能的。
That you are so indifferent bothers me.
你如此冷淡使我很烦恼。
That she survived the accident is a miracle.
她在事故中幸免于难简直是奇迹。
2、用连接代词或连接副词if, whether 引导的主语从句。
例如: Which of them escaped from the prison is still a mystery.
他们哪一个是从监狱里逃跑的,仍然是个谜。
When they will come hasn’t been made pubic.
他们什么时候来还不知道。
Whether she is coming or not doesn’t matter too much.
她来不来都无关紧要。
3、用关系代词引导的主语从句。
例如:What you need is more practice.
你所需要的是更多的训练。
What I want to know is this. 我想知道的就是这事。
Whatever we do is to serve the people.
我们无论做什么都是为人民服务。
4、主语从句可以直接放在主语位置上,也可以用it作形式主语,而将从句放在句末(尤其是当谓语较短时)。
例如:That light travels in straight lines is known to all.
光沿直线传播,这是众所周知的事。
=It is known to all that light travels in straight lines.
众所周知光沿直线传播。
When the plane is to take off has not been announced .
飞机何时起飞还没有宣布。
= It has not been announced when the plane is to take off.
还没有宣布飞机何时起飞。
当what引导的主语从句表示“…的东西”时,一般不用it作形式主语。
错:It is a book what he wants.
对:What he wants is a book. 他想要的是本书。
如果带主语从句的句子是疑问式,则必须用it作形式主语的结构。
例如:Has it been settled who will be sent to carry out the task ?
谁将被派去执行这项任务决定了吗 ?
主语从句与宾语从句区别:
主语从句与宾语从句两者的用法和在句中的作用是不同的,下面从它们的各自用法来介绍。
一.主语从句
主语从句 定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。
主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语,一般常用句型为:It is+{名词/形容词/过去分词}+主语从句例如:
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外,还有一些比较多见的结构:
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同,它的结构是:It+be+被强调部分+that+从句
强调主语:It is the times that produce their heroes.时势造英雄
强调宾语:It is English that Prof.Lin teaches us.
强调状语:It was in shanghai that I saw the film.
判断是否是强调句有一个方法,就是将that以后的“句子的其余部分”拿出来单独看,看有没有缺成分,缺的是什么成分,再把谓语动词后面that前面的那部分,带到你认为缺成分的地方,如果放进去是一句完整的句子了,那就说明是强调句。

2. 用it 作形式主语的结构
(1) It is +名词+that从句
It is a fact that … 事实是……
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is +形容词+that从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物动词+that从句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+过去分词+that从句
It is reported that… 据报道……
It has been proved that… 已证实……

3.主语从句不可位于句首的五种情况
(1) if 引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如:
It is said that President Jingo will visit our school next week.
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如:
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如:
It doesn’t matter whether he is wrong or not.
(5) 含主语从句的复合句是疑问句时,主语从句不可提前。例如:
Is it likely that it will rain in the evening?

4. What 与that 在引导主语从句时的区别
What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然。例如:
What you said yesterday is right.

宾语从句用以区分主语从句的几个特征:
1、引导词:whatwhichwhosewhenwhetherifwhere

2、语序:宾语从句必须是用陈述语句。
如:I think that you must work harder.
宾语从句的引导词、连接词的区别、否定转移等现象。
(1)表达时间的几个句型:一般用when或者是what time:
What time will the train leave?
由于时刻都是固定的,也可以用一般现在时代替一般将来时:
What time does the train leave?
(2)时间的表达方式:8:19(nineteen past eight),7:57(three to eight),在时间的中间也可以加上分的单词(minutes)
(3)had better +动词原型。意思是提要求,建议。但是上下级不能用这种方式,因为语气太重:
You had better give up smoking .
(4)sb leave sth +地点
I left my book in my classroom yesterday.
(5)may I have your name(addressage)?一般询问对方的年龄、名字等,不要习惯以前的问法,这样很不礼貌,而是要采访上面的问法。
以前的习惯是:how old are you? what's your name?
(6)修饰名词的代词次序:限-描-大-形---年---颜----籍----物--------类+名词:
this is a bridge.
This is a beautiful bridge
补充:从句的语序永远是陈述句。
主语从句结构:
1、It is +名词+从句
It is a fact that… 事实是……
It is good news that … ……是好消息
It is a question that … ……是个问题
It is common knowledge that … ……是常识
类似的名词还有:a pity;a wonder;a good thing; no wonder; surprise等。
例如:It is a mystery to me how it all happened.
这一切是怎么发生的是个谜。
It is common knowledge that the whale is not a fish.
鲸鱼不是鱼,这是常识。
It is no surprise that Bob should have won the game.
鲍勃会赢得这场比赛,这不足为奇。

2、It is +形容词+从句
It is necessary that … 有必要……
It is clear that … 很清楚……
It is likely that … 很可能……
It is important that … 重要的是……
类似的形容词还有:
strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.
例如:It is obvious that conductors and insulators are both important in industry.
很明显导体和绝缘体在工业中都很重要。
It is doubtful whether she will be able to come.
她是否能来令人怀疑。
It was really astonishing that he refused to talk to you .
他拒绝和你说话真是令人惊讶。
It is essential that he should be here by the weekend .
周末之前,他应该到这里是必要的。
It seems obvious that we can not go on like this.
很明显我们不能这样下去了。

3、It is +过去分词+从句
It is said that … 据说……
It is reported that … 据报道……
It has been proved that … 已证明……
It must be proved that… 必须指出……
类似的过去分词还有:known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc.
例如:It is thought that he is the best player.
大家都认为他是最好的选手。
It is estimated that the vase is 2000 years old.
据估计这个花瓶有2000年的历史。
It is used to be thought that a new star must be due to a collision between two stars.
过去一直认为新星是由于两颗星星之间碰撞产生的。
It has not been made clear when the new road is to be opened to traffic.
还没弄清楚这条路将开始通车。

4、It +不及物动词+从句
It seems that … 好像是……
It happened that… 碰巧……
It follows that … 由此可见……
It has turned out that … 结果是……
类似的不及物动词还有:seem, appear, occur, follow, happen, turn out, etc.
例如:It turned out that nobody remembered the address.
结果是无人记得那个地址。
It now appears that they are in urgent need of help.
看起来他们急需帮助。
It does not matter if I missed my train, because there is another later.
没有赶上这趟火车没有关系,稍晚还有一趟。
It happened that I saw him yesterday.
碰巧我昨天看见他了。
当“及物动词 + 宾语”较短时,也可用这种结构。
例如:It shocked me that Peter did not tell anybody where he was.
让我吃惊的是彼得没有告诉任何人他在哪里。
It does not interest me whether you go or not.
我对你去不去不感兴趣。
It +某些固定结构+ 主语从句。
例如:It doesn’t make too much difference (It doesn’t make any difference / It doesn’t alter the situation),whether it rains or not .
下不下雨都没有多大关系。
It does not make any difference whether it rains or not .
下不下雨没什么分别。
It does not make the least difference to me what you do.
对我来说你做什么都无关紧要。
Is it of much consequence to you that Mr. Wang has failed to do it ? 王先生没有做成这件事对你有什么重要影响吗?