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初中二年级英语

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  • 填空题
    句型拓展。
    1.They aredoing their homework now. (提问划线部分)
    __________ are they doing now?
    2.Letˊs go to the Great Wall,________ __________(完成反意疑问句)
    3.They had a math test last week.(用next替换last改写句子)
    We_______ _______a math test next week.
    4.She isbabysitting her sisterfor vacation. (提问划线部分)
    __________ she ___________ for vacation?
    5.The boy is doing his homeworkafter school. (提问划线部分)
    _______ __________the boy _________after school?
    本题信息:2012年山东省同步题英语填空题难度一般 来源:吴月晶(初中英语)
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本试题 “句型拓展。1.They aredoing their homework now. (提问划线部分)__________ are they doing now?2.Letˊs go to the Great Wall,________ __________(完成反...” 主要考查您对

疑问代词

现在进行时

特殊疑问句

反意疑问句

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。
  • 疑问代词
  • 现在进行时
  • 特殊疑问句
  • 反意疑问句

疑问代词:
疑问代词在句中起名词的作用,用来构成疑问句。常用的疑问代词有:   
what, who, whose, whom, which, whatever, whichever, whoever, whomever   
疑问代词在句中应位于谓语动词之前,没有词性和数的变化,除who之外也没有格的变化。 
what, which, whose还可作限定词。
Whose books are these on the desk?
桌上的书是谁的?
What was the directional flow of U. S. territorial expansion?
美国的领土扩张是朝哪个方向的?
What events led to most of the east of the Mississippi River becoming part of the United States?
哪些事件使密西西比河以东的大部分土地归属于美国?
疑问代词在句中起名词词组的作用,用来构成疑问句。疑问代词有下列几个:
指 人: who, whom, whose
指 物: what
既可指人又可指物: which


疑问代词说明:
一、无论是做疑问代词还是限定词,which 和 what 所指的范围不同。what所指的范围是无限的,而which则指在一定的范围内,例如:
Which girls do you like best?
你喜欢哪几个姑娘?
What girls do you like best?
你喜欢什么样的姑娘?

二、Whom是who的宾格,在书面语中,它作动词宾语或介词宾语,在口语中作宾语时,可用who代替,但在介词后只能用whom, 例如:
Who(m) did you meet on the street?
你在街上遇到了谁?(作动词宾语)
Who(m) are you taking the book to?
你要把这书带给谁?(作介词宾语,置句首)
To whom did you speak on the campus?
你在校园里和谁讲话了?(作介词宾语,置介词 后,不能用who取代。)

三、疑问代词用于对介词宾语提问时,过去的文体中介词和疑问代词通常一起放在句首,现代英语中,疑问代词在句首,介词在句未,例如:
For what do most people live and work?大部分人生活和工作的目的是什么?(旧文体)
What are you looking for?你在找什么?(现代英语)

四、疑问代词还可引导名词性从句,例如:
I can't make out what he is driving at.
我不知道他用意何在。
Can you tell me whose is the blue shirt on the bed?
你能告诉我床上的蓝衬衣是谁的吗?
Much of what you say I agree with, but I cannot go all the way with you.
你说的我大部分同意,但并不完全赞同。


疑问代词用法:
1. 疑问代词有who, whom, whose, which和what, 都是用来构成疑问句的:
Who is calling? 谁打电话来?
Whom do you want to speak to? 你想找谁接电话?
作主语时用who,作宾语时用whom,在口语中用who作宾语时也不少:
Who did you mean? 你指的是谁?
Who are you talking about? 你们在讲谁?
直接跟在介词后时只能用whom:
With whom did you come? 你和谁一道来的?
(口语中说“Who did you come with?时更多一些。)

2. 其他三个疑问代词可用作:
1)主语:
What’s your address? 你的地址怎样写?
Whose is better? 谁的好一些?
Which of these is yours? 哪一本是你的?
2)宾语:
What do you mean? 你是什么意思?
Which do you like better? 哪一个你更喜欢一些?
Whose have you chosen? 你选了谁的?
3)表语:
What’s her name? 她叫什么名字?
Whose is it? 这是谁的?
4)定语(这样用时有些字典标作形容词):
What time does the train leave? 这列火车什么时候离开?
Which room shall we stay in? 我们住哪间房?
Whose passport is this? 这是谁的护照?
现在进行时:
表示现在或当前一段时间正在进行的动作。可以表示有计划的未来,也就是用现在进行时表示将来。
现在进行时的构成是:
主语+be+v.ing〔现在分词〕形式
例如:He is writing on the desk.

现在进行时的构成:
主语+be+v.ing〔现在分词〕形式
第一人称单数I+am+ing.
第一人称复数We+are+ing.
第二人称单(复)数 You+are+ing
第三人称单数 He(She,it)+is+ing
第三人称复数 They+are+ing
肯定句:主语+be(is/am/are)+现在分词
否定句:主语+be(is/am/are)+not+现在分词
一般疑问句:be(is/am/are)+主语+现在分词
特殊疑问句:特殊疑问词+相应be动词+主语+现在分词+Sth?
间接引语中改为过去进行时。

变化规则:
1.直接+ ing(例:sleep+ing 变sleeping)
2.去掉不发音的e+ing(例:bite-e+ing 变biting)
3.重读闭音节,以辅音字母加元音字母加辅音字母结尾的词,要双写尾字母再加ing(例:swim+m+ing=swimming)
4.以ie结尾的重读闭音节,变ie为y+ing (例:die-dying lie-lying)
5结尾为c且c读作/k/时,在结尾加k再加ing,如picnic-picnicking


现在进行时与一般现在时的区别:
(一)现在进行时表示动作的暂时性,而一般现在时表示动作的习惯性和经常性
I am watching TV now. (暂时性)
I watch TV every day. (经常性)
(二)现在进行时可表示短暂性动作,而一般现在时表示长久性动作。
Lucy is living in Beijing.(短时间居住)
Lucy lives in Beijing. (长久性居住)
(三)现在进行时表示的动作可带有感情色彩,而一般现在时所表述的动作通常是事实。
You’re always forgetting the most important things. (责备)
He is always helping others. (赞扬)
He often helps others. (事实)
(四)有些动词不能用进行时,know, understand, love, like, hate, wish, want, think, hope, have, believe, agree, hear, see, notice,等等。
这些动词通常用一般现在时表示说话时发生的动作。
I have a lot of friends here.
She wants to buy a new bike.

现在进行时用法注意:
1.进行时中,并不是所有的动词都要使用正在进行时。
例如一些表示状态和感觉的动词,一般不用进行时态,而是用现在一般时表示。
这些动词往往是等表示情感状态、知觉认识、愿望或短暂性的动词。
例如:see(明白),know, want, like, hear, have(有), think, hope, hate等。
I hear someone singing. 我正听见有人唱歌。
Do you see anyone over there? 你看到那里有什么人吗?
What does he think of it? 他觉得这怎么样?
如果这些词使用正在进行时态,句子带有某种感情色彩。例如:
Are you seeing someone off? 你在给谁送行吗?
They are hearing an English talk. 他们在听一个英语报告。

2.现在进行时还有另外一种含义,即它们能表达即将发生的事情,相当于一般将来时。
有些动词从结构来看是现在进行时,但却是表示将要发生的事,而不表示动作现在正在进行。
这些动词往往是一些表示位置移动变化的动词:arrive, come, do, get, go, have, leave, meet, play, return, see, spend, start, stay, wear, work等。
We are leaving on Friday。我们星期五出发。
Are you going anywhere tomorrow?你明天准备去哪儿?
A foreign guest is giving a lecture this afternoon。今天下午一个外国客人将给我们作报告。
Are you staying here till next week? 你打算在这里呆到下个星期吗?
在表示将来的情况下,特别是be going to do sth. 这种结构,已经没有多少“去”的意思了,几乎就是用来表达“将要、打算”做什么事情。例如:
It is going to be rather cold tomorrow。明天很可能非常冷。
She is not going to speak at the meeting。她不打算在那个会上发言。

3.当其与always、forever、continually、constantly 等副词连用时表示重复的动作,而这种动作可能使人不满,厌倦或满意。例如:
①She is perpetually interfering in my affairs.她老是干预我的事。 (不满)
②The students are making progress constantly.学生们在不断进步。 (满意)

4.在时间、条件状语从句中,有时可用现在进行时代替一般将来时。
When you are passing my way,please drop in.
你什么时候路过我家,请进来坐。


现在进行时的用法:
A表示现在( 指说话人说话时) 正在发生的事情。
例:We are waiting for you.
B. 表示现阶段正在进行的动作,说话时未必正在进行。
例:Mr. Green is writing another novel.
(说话时并未在写,只处于写作的状态。)
例:She is learning piano under Mr. Smith.
C.已经确定或安排好的但不确定会不会发生的将来活动。
I'm leaving for a trek in Nepal next week.(我下周要去尼泊尔旅行)
We're flying to Paris tomorrow.(我们明天乘飞机去巴黎)现在进行时的应用
D .些非持续性动词的进行时可以表示动作即将进行或发生,或表示动作的重复。
   例如:He is joining the army.
E.当现在进行时中有always, forever, constantly, continually修饰时,表示说话人的
   赞赏或厌烦的情绪。
   例如:They are always helping us.
注意:表示状态、感觉、心理活动的静态动词时,一般不使用进行时态。
F.子中有now时,常表示动作正在进行,这时要用现在进行时。如:
They are playing basketball now.现在他们正在打篮球。
G.ook, listen开头的句子,提示我们动作正进行,这时要用现在进行时。如:
Listen!She is singing an English song.听,她正在唱英语歌。
H.当前一段时间或现阶段正在进行的动作,且此时有this week, these days等时间状语,这时常用现在进行时。如:
We are making model planes these days.这些天我们在做飞机模型。
I.图片中的人物的动作,也为了表达更生动。此时也常用现在进行时。如:
Look at the picture. The children are flying kites in the park.看这幅图,那些孩子正在公园放风筝。
特殊疑问句:
以特殊疑问词开头,对句中某一成分提问的句子叫特殊疑问句。
常用的疑问词有:what、who、whose、which、when、where、how、why等。
特殊疑问句的基本结构是“疑问词+一般疑问句”。
其回答应当是具体的。特殊疑问句句末一般用降调。 
例如:How do I get there? 
            Why not? 
            What about the sports news?
常用疑问词可先分为3种:
疑问代词:
what(什么)
who(谁,作主语)
which(哪个,在一定范围内选择)
whose(谁的,指附属关系)
whom(谁,作宾语)

疑问副词:
when(何时,询问时间)
where(何地,询问地点)
why(为什么,询问原因)
how(如何,询问手段,方式,工具以及程度)

疑问形容词:
what(which,whose)+名词
例词:
what time(什么时候) what colour(什么颜色)... ...
how much(多少) how long(多长)...

特殊疑问句的特点:
一、 特殊的疑问词:
特殊疑问句要由疑问代词或疑问副词开头,询问的内容不同, 使用的疑问词也不同。
我们学过的疑问词有what(询问事物), how much(询问价格), what time (询问时间,尤其是点钟), what kind of(询问种类), why(询问原因),who(询问人), where(询问地点) 等等。如:
—What is this? 这是什么?
—It's a key. 这是一把钥匙。
—How much is it? 这个多少钱?
—It's twenty dollars. 二十美元。
—What kind of movies do you like? 你喜欢哪一类型的电影?
—I like action movies. 我喜欢动作片。

二、特殊的语序:
特殊疑问句由疑问词开头,其构成是“疑问词 + 一般疑问句”。如:
What time is it? 现在几点钟?
Who is your teacher? 谁是你的老师?
特殊疑问句有两种语序:
1.如疑问词作主语或主语的定语,即对主语或主语的定语提问,其语序是陈述句的语序:
Who is singing in the room﹖
whose bike is broken﹖
2.如疑问词作其他成分,即对其他成分提问,其语序是:
特殊疑问词+一般疑问句(特殊疑问词+be/助动词/情态动词+主语+谓语)
What does she like?
What class are you in﹖
Where are you from﹖
What time does he get up every morning﹖
How do you know﹖
 
三、特殊的答语:
特殊疑问句不能用yes, no来回答,而应根据它所询问的内容直接做出回答才行。如:
— What time is it, please? 请问几点了?
— It's 7:30. 七点半了。
— Where are they? 他们在哪儿?
—They're in the playground. 他们在操场上。
—What's your favorite subject? 你最喜爱的科目是什么?
—English. 英语。

四、 特殊的语调:
一般情况下,特殊疑问句要用降调(↘)来读。如:
Who's ↘that?
How old is↘Jack?
反义疑问句:
表示提问人的看法,没有把握,需要对方证实。
反意疑问句由两部分组成:前一部分是一个陈述句,后一部分是一个简短的疑问句,两部分的人称时态应保持一致。
1. 陈述部分肯定式+疑问部分否定式可记为前肯后否。 
2. 陈述部分否定式+疑问部分肯定式可记为前否后肯。
例如:This pencil is red, isn’t it? Yes, it is. / No, it isn’t. 
               This pencil isn’t red, is it? Yes, it is. / No, it isn’t.
速记:
前肯后否,前否后肯,前be后be,前无be后加助,时态一致。

反意疑问句的回答
前肯后否,前否后肯,根据事实从后往前翻译。如:
(1)They work hard,don’t they?他们努力工作,不是吗?
Yes, they do.对,他们工作努力。/No, they don't.不,他们工作不努力
(2)They don’t work hard, do they? 他们不太努力工作,是吗?
Yes, they do. 不,他们工作努力。/No, they don't. 是的, 他们工作不努力

否定反义疑问句的回答
当陈述部分为肯定式,反义疑问句为否定式时,其回答一般不会造成困难,一般只需照情况回答即可:
"It’s new, isn’t it?" "Yes, it is." “是新的,不是吗?”“是,是新的。”
"He wants to go, doesn’t he?" "No, he doesn’t." “他想去,不是吗?”“不,他不想去。”
此时,"Yes"即是,对前面"It's new."的肯定。

回答反义疑问句的原则
回答反意疑问句通常应根据实际情况来确定,
如有人问你You are asleep, aren’t you? 你应回答No, I’m not. 因为既然你能回答,肯定你还没有asleep。
但如果别人问你 You aren’t asleep, are you?(你还没有睡着,对吗),你也只能回答No, I’m not.(是的,还没有睡着),而不能回答为Yes, I’m not. 也不能回答成 Yes, I am.
“It is a beautiful flower,isn't it?” “It isn't a beautiful flower,is it?”
上述两句句子的回答肯定均为“Yes,it is."否定为“No,it isn't."
由上述例子可知,反义疑问句回答与句子本身所包含的中文肯定与否的含义并无太大关联,只需注意事实,肯定即用yes,否定用no,无需考虑句子原本是前否后肯或是前肯后否。

口诀:
反意疑问并不难,陈述疑问句中含。
前后肯否恰相反,否定词缀不能算。
主谓时态要一致,特殊情况记心田。
实际情况来回答,再把yes和no拣。
综上所述,反义疑问句回答就是按实际情况回答。
对反意疑问句的回答,无论问题的提法如何,如果事实是肯定的,就用yes,事实是否定的,就要用no。
要特别注意陈述句部分是否定结构,反意疑问句部分用肯定式提问时,回答yes或no与汉语正好相反。这种省略回答的yes要译成“不”,no要译成“是”。
例:
—He likes playing football, doesn’t he? 他喜欢踢足球,不是吗?
—Yes, he does. / No, he doesn’t. 是的。/ 不是。
—His sister didn’t attend the meeting, did she? 他妹妹没有参加会议,是吗?
—Yes, she did. / No, she didn’t. 不,她参加了。/ 是的,她没参加。


快速记忆表:
陈述部分的谓语   疑问部分
I/主语   aren't I / are I
no,nothing,nobody,never,few, seldom, hardly,rarely, little等否定含义的词   肯定含义
含有un-,in-.dis-,im-等否定意义的前缀构成的词语时,视为肯定含义   否定含义
ought to(肯定的)   shouldn't/ oughtn't +主语
have to+v.(had to+v.)   don't +主语(didn't +主语)
used to+v.   didn't +主语或 usedn't +主语
had better + v.   hadn't you
would rather + v.   wouldn't +主语
you'd like to + v.   wouldn't +主语
must   根据实际情况而定
感叹句   be +主语
指示代词或不定代词everything,that,nothing,this   主语用it
并列复合句   谓语根据邻近从句的谓语而定
定语从句,宾语从句主从复合句   根据主句的谓语而定
think,believe,expect,suppose,imagine等引导   与宾语从句相对应的从句
everybody,anyone,somebody,nobody,no one   复数they, 单数he
情态动词dare或need   need/needn't (dare/daren't ) +主语
dare, need 为实义动词   do/don't +主语
省去主语的祈使句   will/won't you?
Let's 开头的祈使句   Shall we?
Let us 开头的祈使句   Will you?
there be   相应的谓语动词+there(省略主语代词)
否定前缀不能视为否定词   仍用否定形式.
反意疑问句19条:
1) 陈述部分的主语是I,疑问部分要用 aren't I.
I'm as tall as your sister,aren't I?
2) 陈述部分的谓语是wish,疑问部分要用may +主语。
I wish to have a word with you, may I?
3) 陈述部分用 no, nothing, nobody, never, few, seldom, hardly, rarely, little等否定含义的词时,疑问部分用肯定含义。
The Swede made no answer, did he / she?
Some plants never blown (开花), do they ?
4) 含有ought to 的反意疑问句,陈述部分是肯定的,疑问部分用shouldn't / oughtn't +主语。
He ought to know what to do, oughtn't he? / shouldn't he?
5) 陈述部分有have to +v. (had to + v.),疑问部分常用don't +主语(didn't +主语)。
We have to get there at eight tomorrow, don't we?
6) 陈述部分的谓语是used to 时,疑问部分用didn't +主语或 usedn't +主语。
He used to take pictures there, didn't he? / usedn't he?
7) 陈述部分有had better + v. 疑问句部分用hadn't you?
You'd better read it by yourself, hadn't you?
8) 陈述部分有would rather +v.,疑问部分多用 wouldn't +主语。
He would rather read it ten times than recite it, wouldn't he?
9) 陈述部分有You'd like to +v. 疑问部分用wouldn't +主语。
You'd like to go with me, wouldn't you?
10) 陈述部分有must 的疑问句,疑问部分根据实际情况而定。
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?
11) 感叹句中,疑问部分用用否定的助动词加sb/sth?如:
1)What a fine day it is today!
What a fine day it is today,isn“t it?
2)How fast he runs!
How fast he runs,doesn”t he?
3)What a long time we have been waiting!
What a long time we have been waiting ,haven“t we?
12) 陈述部分由neither… nor, either… or 连接的并列主语时,疑问部分根据其实际逻辑意义而定。
Neither you nor I am engineer, are we?
13) 陈述部分主语是指示代词或不定代词everything, that, nothing, this, 疑问部分主语用it。
Everything is ready, isn't it?
14)陈述部分为主语从句或并列复合句,疑问部分有三种情况:
a. 并列复合句疑问部分,谓语动词根据邻近从句的谓语而定。
Mr. Smith had been to Beijing for several times, he should have been in China now, shouldn't he?
b. 带有定语从句,宾语从句的主从复合句,疑问部分谓语根据主句的谓语而定:
He is not the man who gave us a talk, is he?
He said he wanted to visit Japan, didn't he?
c. 上述部分主句谓语是think, believe, expect, suppose, imagine等引导的定语从句,疑问部分与宾语从句相对应构成反意疑问句。
I don't think he is bright, is he?
We believe she can do it better, can't she?
15) 陈述部分主语是不定代词everybody, anyone, somebody, nobody, no one等,疑问部分常用复数they,有时也用单数he。
Everyone knows the answer, don't they? (does he?)
Nobody knows about it, do they? (does he?)
16) 带情态动词dare或need的反意疑问句,疑问部分常用 need (dare ) +主语。
We need not do it again, need we ?
He dare not say so, dare you?
当dare, need 为实义动词时,疑问部分用助动词do + 主语。
She doesn't dare to go home alone, does she?
17) 省去主语的祈使句的反意疑问句,疑问部分用will you。
Don't do that again, will you?
Go with me, will you / won't you ?
注意: Let's 开头的祈使句,后用shall we?
Let us 开头的祈使句,后用will you?
Let's go and listen to the music, shall we?
Let us wait for you in the reading-room, will you ?
18) 陈述部分是"there be"结构的,疑问部分用there省略主语代词。
There is something wrong with your watch, isn't there?
There will not be any trouble, will there?
19) 否定前缀不能视为否定词,其反意疑问句仍用否定形式。
It is impossible, isn't it?
He is not unkind to his classmates, is he?
有些动词如:cost hurt hit put 等,它们的过去时与原型相同,在肯定句中一定要先弄清楚它们是什么时态.
英语18种特殊的反意疑问句:
1.祈使句。祈使句后一般加上will you或won't you构成反意疑问句,用will you 多表
示“请求”,用won't you 多表示提醒对方注意。例如:    
Look at the blackboard, will you/ won't you?看黑板,好吗?   
Let 引导的祈使句有两种情况:   
1) Let's...后的反意疑问句用shall we或shan't we。例如:   
Let's go home, shall we/ shan't we? 回家吧,好吗?    
还可以用may I来表示征求对方的同意或许可。   
2) Let us/me...后的反意疑问句用will you或won't you。例如:    
Let me have a try, will you/won't you? 让我试一试,行吗?   
2. 感叹句。感叹句后加反意疑问句时,其反意疑问句需用be的一般现在时态的否定形式。 例如:   
What fine weather, isn't it? 多好的天气啊,是吧?    
3. 当陈述部分谓语动词是need, dare, used to,且这些词被用作实义动词时,其反意疑问 句需用do的适当形式。例如:   
He needs help, doesn't he? 他需要帮助,是吗?    
4. 陈述部分主、谓语是I am...时,反意疑问句用aren't I 或am't I ,而不是am not I (可 用a m I not)。例如:   
I'm working now, am't I? 我在工作,是吗?   
5. 陈述部分的主语是everything, nothing, anything或something 时,反意疑问句的主语应用代词it。例如:    
Something is wrong with my radio, isn't it? 我的收音机出毛病了,是吧?   
6. 陈述部分的主语是 everybody, everyone, anybody, anyone, somebody, someone, nobody, no one, none, neither 时, 其反意疑问句的主语需用复数代词they。 例如:   
Everyone is here, aren't they? 大家都到了,是吗?   
No one knows about it, do they? 没有人知道这件事,对吗?   
7. 陈述部分的主语是指示代词this或that时,反意疑问句的主语用it,当陈述部分的主语是指示代词these或those时,其反意疑问句的主语用they。 例如:   
This is a plane, isn't it? 这是一架飞机,是吗?   
These are grapes,aren't they? 这些是葡萄,是吗?   
8. 陈述部分的主语是不定代词one时,反意疑问句的主语可以用one,也可用you(美式英语用he)。例如:   
One should be ready to help others, shouldn't one? 每个人都应该乐于助人,是吧?   
9. 当陈述部分含有以下这些含有否定意义的词时:few, little, seldom,hardly, never, not,  no, no one, nobody, nothing, none, neither等,其反意疑问句需用肯定结构。 例如:    
He is never late for school, is he? 他上学从不迟到,是吗?   
10. 当陈述部分所含的否定词是通过加前缀或后缀构成的,其后的反意疑问句依然用否定结构。例如:   
   It is unfair, isn't it? 这不公平,是吧?   
11.含有否定含义的词在陈述部分作动词的宾语时,其反意疑问句用肯定结构,也可以用否定结构。例如:   
You got nothing from him, did you? 你从他那儿什么也没得到,是吗?   
12. 当陈述部分主语是从句、不定式(短语)、动词-ing形式时,反意疑问句的主语应该用it。  例如:   
What you need is more important, isn't it?你需要的东西更重要,是吧?   
13. 当陈述部分含I think (believe, suppose...)that... 结构时,其反意疑问句须与从句的主、谓语保持一致,注意主句的主语必须是第一人称。例如:   
I don't think he will come, will he? 我认为他不会来,对吗?   
14.have(has)不是表示“有”的意思,并在句中做谓语时,其反意疑问句的助动词要用do, does, did。例如:   
They had a meeting just now,didn't they? 他们刚才开了个会,是吗?   
15. 陈述部分有have to 时,其反意疑问句要用助动词的否定形式。例如:   
You have to water the vegetables every day, don't you?你每天都要浇菜,对吧?   
16. 陈述部分是there be句型时,其反意疑问句中要用there。例如:   
There was a hospital here, wasn't there? 过去这儿有家医院,是吗?   
17. 陈述部分有had better时,反意疑问句中要用hadn't。 例如:   
We had better go to school at once, hadn't we? 我们现在最好马上去上学,好吗?
18. 当陈述部分含有情态动词must时,我们便要分析一下must的含义。如果must 作“一定;要;必须”讲,反意疑问句须用mustn't或needn't;
而当must作推测意义“一定 是;必定”讲时,反意疑问句则需根据must后的动词原形选用相应的形式。例如:    
He must work hard at physics, mustn't he? 他必须努力学物理,是吧?   
Tom must be at home,isn't he? 汤姆一定在家,是吧?