初中英语知识点:相互代词

逍遥右脑  2015-12-02 10:00

相互代词:
就是表示相互关系的代词。它与它所指代的名词或代词是一种互指关系,因此它们是复数或者二者以上。
英语中的相互代词只有两个,即each other和one another。
在正式文体中多用each other指两者,用one another指两者以上。
我们应当把它们当作复合代词看待,即使在分开使用时,它们也是相互关联的。
在句中,相互代词可用作宾语、定语等。例如:
Don't talk to each other (one another).
We must help one another.

相互代词的用法:
相互代词只有each other和one another两个词组。他们表示句中动词所叙述的动作或感觉在涉及的各个对象之间是相互存在的,例如:
It is easy to see that the people of different cultures have always copied each other.
显而易见,不同文化的人总是相互借鉴的。

相互代词的句法功能:
a. 作动词宾语;
We often help each other in our lessons.
我们经常在功课上互相帮助。
They see one another every day.
他们每天见面

b. 可作介词宾语;
Does bark, cocks crow, frogs croak to each other.
狗吠、鸡鸣、蛙儿对唱。
说明:传统语法认为,相互关系存在于两个人或物之间用each other,存在于两个以上人和物之间用one another。
现代英语中,两组词交替使用的实例也很多,例如:
He put all the books beside each other.
他把所有书并列摆放起来。
He put all the books beside one another.
他把所有书并列摆放起来。
Usually these small groups were independent of each other.
这些小团体通常是相互独立的。

c.作定语时须用所有格
The students borrowed each other's notes.
学生们互借笔记。

相互代词each other和one another的区别:
1. 一般认为 each other 指两者,other another指三者或三者以上。但在实际运用中,这两个短语常可互换:
We respect each other [one another]. 我们互相尊重 (对方)。
The sea and the sky seemto melt into one another [each other]. 大海和蓝天似乎融为一体。
2. 两者均有所有格:They know each other’s [one another’s] weak points. 他们都彼此了解对方的缺点。
3. each other 可折开用 (each…the other),而 one another则不能:
We helped each other. =We each helped the other. 我们互相帮助。
4. 汉语的“互相”是副词,但是英语中的 each other 和 oneanother均为代词,因此在及物动词之后可直接用作宾语 (如help eachother);
而在不及物动词之后,则要借助介词 (如talk to each other, learn from one another 等)。
5.这两个短语均不能用作主语:
正:We each know what the other thinks.
误:We know what each other [one another] thinks.
正因为不能用作主语,所以用它们作宾语的句子不能改为被动语态。




相关初中英语知识点:情态动词

情态动词:
是一种本身有一定的词义,表示说话人的情绪、态度或与语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。
无人称和数的变化,情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加 “not”。
个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气, 时态性不强,可用于过去,现在或将来。情态动词属非及物动词,故没有被动语态。
情态动词有四类:   
①只做情态动词:must, can(could),may(might)……   
②可做情态动词又可做实义动词:need, dare   
③具有情态动词特征:have(had, has) to, used to   
④情态动词表猜测
注:mustn't代表强烈禁止 must表示主观,have to表示客观。
常用的有:can may could must have use .

情态动词特点:
情态动词无人称和数的变化,情态动词后面跟的动词须用原形,否定式构成是在情态动词后面加 "not"。
个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气,时态性不强,可用于过去,现在或将来。情态动词属非及物动词,故没有被动语态。
He could be here soon.他很快就来。
We can't carry the heavy box.我们搬不动那箱子。
I'm sorry I can't help you.对不起,我帮不上你。

基本助动词与情态助动词最主要的区别之一是:
基本助动词本身没有词义,而情态助动词则有自己的词义,能表示说话人对有关动作或状态的看法,或表示主观设想:
What have you been doing since? (构成完成进行体,本身无词义)
I am afraid I must be going. (一定要)
You may have read some account of the matter. (或许已经)

除此之外,情态助动词还有如下词法和句法特征:
1) 除ought和used以外,其他情态动词后面只能接不带to的不定式。如果我们把ought to和used to看做是固定词组的话,那么,所有情态动词无一例外地只能接不带to的不定式:
We used to grow beautiful roses.我们过去常常种这种漂亮的玫瑰花
I asked if he would come and repair my television set.我问他是否来修我的电视机
2) 情态助动词在限定动词词组总是位居第一:
They need not have been punished so severely.
3) 情态助动词用于第三人称单数现在时的时候,没有词形变化,即其词尾无-s形式:
She dare not say what she thinks.
4) 情态动词没有非限定形式,即没有不定式和分词形式,也没有相应的动名词:
Still,she needn't have run away.
5)情态助动词的“时”的形式并不是时间区别的主要标志。在不少场合,情态助动词的现在时和过去时形式都可以表示现在、过去或将来时间:
Would you mind very much if I ask you to do something?
She told him he ought not to have done it.
6) 情态助动词之间是相互排斥的,即在一个限定动词词组中只能出现一个情态助动词,但有时却可以与have和be基本助动词连用:
You should have washed the wound.
Well,you shouldn't be reading a novel.
7)情态动词must一般疑问句否定回答用needn't
Must I read books every day、
No,you needn't



常见情态动词用法:
1.can (could) 表示说话人能,可以,同意,准许,以及客观条件许可,could 为 can 的过去式。
2.Must 必须,应该,一定,准是,表示说话人认为有必要做某事,命令,要求别人做某事以及对事物的推测。
must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。
must + have + 过去分词,表示现在对过去事物的推测。
must 和 have to 的区别:must 表示说话人的主观思想,have to 表示客观需要。
3.need 是一个情态动词,他的用法完全和其他情态动词一样,但 need 还可当作实义动词使用,这时 need 就象其他动词一样,有第三人称,单复数, 后面加带 to 的动词等特性。
needn't + have + 过去分词 表示过去做了没必要做的事情。
4.dare 除用作情态动词外,更多的是当实义动词使用, 用法同实义动词一样,要考虑人称,单复数,时态等。
5.ought 应当,应该。后面跟带有 to 的动词不定式。
ought + to have done 句型。指过去动作,表示一件事情该做而未做。
ought not to have done 句型。表示一件不该做的事情却做了。
6.will (would)决心,愿望。 would 为 will 的过去式,
will, would用于疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。
7.Shall、should 表示命令,警告,允诺,征求,劝告,建议,惊奇。
8.have to,不得不,必须,表示客观条件只能如此,而must 则表示主观思想。



情态动词功能:
助动词主要有两类:基本助动词和情态助动词。
基本助动词有三个:do,have和be;
情态助动词基本的有十四个:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to.had better 上述两类助动词的共同特征是,在协助主动词构成限定动词词组时,具有作用词的功能:
1) 构成否定式:
He didn't go and neither did she.
The meeting might not start until 5 o'clock.
2) 构成疑问式或附加疑问式:
Must you leave right now?
You have been learning French for 5 years, haven't you?
3) 构成修辞倒装:
Nowhere can he obtain any information about his sister.
Hardly had he arrived when she started complaining.
4) 代替限定动词词组:
A: Who can solve this crossword puzzle?
B: Tom can.
A: Shall I write to him?
B: Yes, do.

情态动词表推测的用法小结   
(一)情态动词表推测的三种句式   
1.在肯定句中一般用must (一定),may(可能),might /can, could(也许,或许)。   
(1)He must/may/might know the answer to this question?   
他一定/可能/也许知道这个问题的答案。   
(2)It is cold in the room. They must have turned off the heating.   
屋里很冷,他们肯定把暖气关了。   
2. 否定句中用can’t / couldn’t(不可能), may not/might not (可能不)。   
(1)It can’t/couldn’t be the headmaster. He has gone to America. 这不可能是校长,他去美国了。   
(2)He may not/might not know the scientist. 他也许不认识那位科学家。   
3. 疑问句中用can/could (能……?)。   
(1)Could he have finished the task?他可能把任务完成了吗?   
(2)Can he be at home now? 他现在能在家吗?   
注:以上三种句式中情态动词的语气按程度都是依次递减的。Might, could并非may, can的过去式,而表示语气较为委婉或可能性较小。   

(二)情态动词表推测的三种时态   
1. 对将来情况的推测,用“情态动词 + 动词原形”。   
(1)She must / may / might / could arrive before 5. 5: 00 前她一定/可能/也许到。   
(2)She must/may/might/could walk miles and miles among the hills without meeting anyone.   
她一定/可能/也许会在山里一连走好几英里而遇不到一个人。   
2. 对现在或一般情况的推测,用“情态动词 + be”,“情态动词 +be doing”或 “情态动词 + 动词原形”。   
(1)He must / may / might / could be listening to the radio now. 他一定/可能/也许正在听收音机。   
(2)He can’t ( couldn’t ) / may ( might ) not be at home at this time. 这个时候他不可能/可能不在家。   
(3)Mr. Bush is on time for everything .How can ( could ) he be late for the opening ceremony ?   
布什先生一向准时,这次开幕式他怎么可能迟到呢?   
3.对过去情况的推测,用“情态动词 + have +过去分词”。   
(1)It must / may / might / could have rained last night .The ground is wet. 地湿了,昨晚肯定/可能/也许下雨了。   
(2)The door was locked. He can ( could ) not / may ( might ) not have been at home . 门锁着,他不可能/可能不在家。   
(3)Can / Could he have gotten the book? 难道他找到书了吗?   
注:情态动词 should /ought to表推测时,意为“想必会,理应……”但与“have +过去 分词”连用时,则又可构成虚拟语气意为“本应该做某事却没做”。
例如:   
(4)It’s seven o’clock. Jack should/ought to be here at any moment.   
现在七点钟了,杰克理应随时到达。(推测)   
(5)She should / ought to have attended your birthday party, but she had to look after her mother in hospital. (虚拟)   
她本该出席你的生日晚会的,可是她得在医院照顾她妈妈。   
(6)Tom should not /ought not to have told me your secret, but he meant no harm. (虚拟)   
汤姆本不该告诉我你的秘密,可是他并无恶意。


相关初中英语知识点:不定式

动词不定式:
指由to加上动词原形(而且只能是动词原形)所构成的一种非限定性动词,但在有些情况下to可以省略。
动词不定式在语法功能上可作主语、宾语、宾语补足语、表语、定语和状语。

动词不定式可以作以上各种成分,但它毕竟是动词,所以有动词的属性。
动词不定式及其短语还可以有自己的宾语、状语,虽然动词不定式在语法上没有表面上的直接主语,但它表达的意义是动作,这一动作一定由使动者发出。
这一使动者我们称之为逻辑主语,其形式如下:






















时态主动形式被动形式
一般式(not) to do(not)to be done
完成式(not) to have done(not) to have been done
进行式(not) to be doing
完成进行式(not) to have been doing


不定式的用法:
1、不定式作主语
例如:To remember this is very important.
注意:为了避免头重脚轻,在许多情况下,通常都将作主语的不定式置于句子后部,而在句首主语位置使用形式主语it。
例如:It is very important to remember this.
2、不定式作表语
例如:He seems to be ill.
注意:不定式作表语主要有三种情况,一是用于seem, appear, prove等系动词之后的不 定式(尤其是to be),
二是像My job is to sweep the floor. 这样的主语与表语“等价”的情形,
三是表示想法、约定、义务、命令、可能性、命运等,如:
You are to come when I call.
3、不定式作宾语
例如:I can not afford to buy a car.
注意:
①不定式不仅用作动词的宾语,还可用作个别介词(but, except)的宾语。
例如:I had no choice but to wait.
②当作宾语的不定式后跟有宾语补足语时,通常要用形式宾语it代替不定式,并将真正的宾语不定式置于宾语补足语之后
例如:I find it difficult to learn Japanese well.
4、不定式作宾语补足语
例如:Who taught you to drive?
5、不定式作定语
例如:I have a question to ask you.
注意:有的名词(如way, chance, right等)后用作不定式可换成of doing sth.
如:It is the best way to do (of doing) it.
但是以下名词后接不定式作定语时通常不能换成of doing sth.
attempt courage decision effort fortune failure invitation wish
6、不定式作状语
例如:I went to France to learn French.


相关初中英语知识点:反意疑问句

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?


相关初中英语知识点:疑问词组

疑问词组:
即使由疑问词和一些词一起构成的表示疑问的词组。由how/what与另外一个词组成的词组。
例如:
how many (后接可数名词,多少), how much (后接不可数名词,多少),
how often (表示频率), what if (如果…将会怎么样),
what about (…怎么样), what time (几点)

与how搭配的疑问词组:
How在英语中通常用作副词,是特殊疑问句中本领最大的疑问词。他与其它形容词或副词搭配组成疑问词组
1.How old问年龄、年代。
How old is your friend? 你朋友多大了?
How old is the bridge? 这座桥有多少年代了?
2.How many问可数名词数量。常将可数名词复数紧随其后。如:
How many pictures are there on the wall? 墙上有多少幅画?
How many glasses of milk would you like? 你们想要几杯牛奶?
3.How much询问不可数名词的数量、物品的价格。
How much money is there in the purse? 钱包里有多少钱?
How much are the apples at the moment? 目前苹果什么价钱?
4.How long提问物体的长度、时间的长短。
How long is the Changjia River? 长江有多长?
How long does it take you to do your homework every day?
你每天花多长时间做作业?
5.How soon 对 “in+一段时间 ”提问, 表示“多久之后”。
How soon will you be back? 你多久后回来?
6.How often对表示频率的副词或短语提问。
How often does Mrs. Green go shopping? 格林夫人多久去购一次物?
7.How about用来征求对方意见。
Your father is a worker, how about your mother? 你父亲是工人,你母亲呢?
How about playing games after school this afternoon? 下午放学后做游戏怎么样?
8.How far 问两地间的距离How tall问人(树)的高度;how heavy问重量;how wide问宽;how high可以询问建筑物、山峰高度。
How far is it from the earth to the moon? 从地球到月球有多远?
How tall is Yao Ming? 姚明身高多少?
How heavy is that big box? 那只大箱子有多重?
How wide is the new street? 这条新街有多宽?
How high is the tower in Paris? 巴黎的那座塔有多高?

与what搭配的疑问词组:










































疑问词意思用法例句
what什么用来问是什么,叫什么,做什么等1. What’s your name?
你叫什么名字?
2.What’s your father?
你爸爸是干什么的?
3.what is in your box?
你的盒子里是什么?
what
time
什么时间用来问时间1.What time is it? 几点了?
2.What time is it now?
现在几点了?
what
colour
什么颜色用来问颜色1.waht colour is your bag?
你的书包是什么颜色?
2.what colour is your book?
你的书本是什么颜色?
what
about
怎么样用来征求意见或询问感受等,
大多用于承接上面的同样问题

1.what bout this pair of shoes?这双鞋子怎么样?
2.what about you? 你呢?
3.what about your dad?
你爸爸呢?

what
day
星期几用来问星期几1.what day is it today?
今天星期几?
2. what day was yesterday?
昨天星期几?
what
date
什么日期问具体的日期1.What’s the date today?
今天是几号?
2. what date is tomorrow?
明天是几号?
what...for...为何目的用来问目的,在一定情况下只可以与why互换What did you buy that for?
你为什么要买那个?



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