高中情态动词表示推测
第一篇：高中情态动词表示推测
高中情态动词练习题
一 基础题
“ Must we do it now?” “ No, you ______.”
A. won’tB. needn’tC. can’tD. don’t
2. You _____ to the meeting this afternoon if you have something important to do.
A. needn’t to comeB. don’t need comeC. don’t need comingD. needn’t come
3. “ May I pick a flower in the garden?” “ _________.”
A. No, you needn’tB. Not, pleaseC. No, you mustn’tD. No, you won’t
4. You’d better ______ late next time.
A. don’tB. not beC. not beingD. won’t be
5. “ Can I leave this door open at night?”“ You _____ .”
A. should better not B.would better not C.had better not D.had not better
6. Put on more clothes. You _____ be feeling cold with only a shirt on.
A. canB. couldC. wouldD. must
7. You _________ return the book now. You can keep it till next week if you like.
A. can’tB. mustn’tC. needn’tD. may not
8. A computer ______ think for itself; it must be told what to do.
A. can’tB. couldn’tC. may notD. might not
9.----Could I borrow your dictionary?---- Yes, of course you _______.
A. mightB. willC. canD. should
10. ----_______ we go skating or stay at home?---- Which would you rather do yourself?
A. ShallB. MustC. WillD. Should
11. Peter _______ come with us tonight, but he isn’t very sure yet.
A. mustB. mayC. canD. will
12. ----Shall I tell John about it?---- No, you _______. I’ve told him already.
A. needn’tB. wouldn’tC. mustn’tD. shouldn’t
13. ----- Don’t forget to come to my birthday party tomorrow.----- ___________.
A. I don’tB. I won’tC. I can’tD. I haven’t
14. It’s nearly seven o’clock. Jack _____ be here at any moment.
A. mustB. needC. shouldD.can
15.My brother called to say he was all right, but _______ say where he was.
A.mustn’tB.shouldn’tC.wouldn’tD.mightn’t
二 巩固题
1.Your pen is here. That ______ be yours.
A. may notB. can’tC. must notD. can
2.--- You _____ wear a dress(礼服) tonight. You can’t go to the concert in those dirty jeans. ---- Yea, mother, I _____.
A. will; willB. may; canC. must ; willD. have to ; may
3. --- Bonny hasn’t come back yet.
--- Well, where_____ she have gone on such a night?
A. shouldB. mayC. mustD. could
4. I wish to use your bike, ______?
A. don’t IB. may IC. doID. shouldn’t I
5. See who’s there! ______ I t be Mary?
A. MayB. MustC. CanD. Will
6. ---- ______ the film be on now?
---- It ______be, but I’m not too sure.
A. Can, can’tB. May, mustn’tC. Must, needn’tD. Can, may
7. John _____ be a basketball player. He’s much too short.
A. mayB. mustn’tC. can’tD. should
8. You _____ call him, for(因为) he’ll surely come here soon.
A. needn’tB. mustn’tC. may notD. can’t
9. I talked for a long time, and in the end I _____ make him believe me.
A. was able toB. couldC. mayD. might
10. Please open the window, ______? (88，上海)
A. can’t youB. aren’t youC. do youD. will you
11. ---- Write to me when you get home.(01, 春招)
---- ____________.
A. I mustB. I shouldC. I willD. I can
12. --- I hear you’ve got a set of valuable Australian coins. _____ I have a look?( 02,上海春招)---- Yes, certainly.
A. DoB. MayC. Shalld. Should
13. My English –Chinese dictionary has disappeared . Who _______ have taken it? (03,上海春招)
A. shouldB. mustC. couldD. would
14.--- I hear they went skiing in the mountains last winter.(02, 北京)
--- It __________ true because there was little snow there.
A. may not beB. won’t beC. couldn’t beD. mustn’t be
15. A left- luggage office is a place where bags ______ be left for a short time, especially at a railway station.(03)
A. shouldB. canC. mustD.will
16. ---- Isn’t that Ann’s husband over there?
----- No, it ____ be him. I am sure he doesn’t wear glasses. (04 , 1)
A. can’tB. mustn’tC. won’tD. may not
17. You ___________ be tired ----- you’ve only been working for an hour.(04,2)
A. must notB. won’tC. can’tD. may not
18. I often see lights in that empty house. Do you think I ______ report it the police?(04,3)
A. shouldB. mayC. willD. can
19. Tom, you_____ leave all your clothes on the floor like this!(05,1,2)
A. wouldn’tB. mustn’tC. needn’tD. may not
20. The World Wide Web is sometimes jokingly called the world wide wait because it ______ be very slow.
A. shouldB. mustC.willD. can
第二篇：情态动词只有情态意义
情态动词只有情态意义，即它所表示的是说话人对动作的观点，如需要、可能、意愿或怀疑等。
情态动词的特征：
1.在形式上，情态动词没有实义动词的各种变化。
2.在意义上，大多数情态动词有多个意义。
3.在用法上，情态动词与助动词一样，须后接动词原形。
情态动词各自的基本意义及用法
一、can 与could用法对比表
对比点 can could
1、表“能力” Can you lift this heavy box? I couldn’t understand what he said at all.
2、表“许可” You can use a different material instead. He said I could borrow his bike.
3、“怀疑” No, no, it can’t be true.
What on earth can this mean? We thought the story could not be true. How could you be so careless?
4、can与be able to 区别 1. could代替 can，表示语气更为婉转。
Eg. Could I use your bike? Yes, you can.
2. can (能够)=be able to(仅表能力时)，但be able to 表示一番努力后，才能做得到，且有更多的时态。
He was a good swimmer, so he __________ swim to the river bank when the boat sank.
A. could B. might C. shall D. was able to
二、may与 might用法对比表
对比点 may Might
1.表“询问” May I „?(=Can I „?) Might I „?(=Could I„?)(但比用may 更客气) 1
2.表“允许” You may take the boy there. He told me he might come .(might 与told相呼应)
3.表“可能”“或许” She may nor like this place. I’m afraid he might not like this play.
注： 1. May I„?的答语。
2.may可表示期望或祝愿
May you succeed !
3.may (might)用于目的状语从句中 肯定：Yes, you may.
否定：No, you mustn’t 不行(语气强硬)
No, you may not 或No, you’d better not.
The emperor gave them some gold in order that they might begin their work at once.
三、must与have to的用法对比表
对比点 must have to
1.表“必须” (主观看法)必须;没有过去式，可用于间接引语中。He told me I must do according to what he said. (客观需要)不得不，有多种时态。It’s raining heavily, we can’t go now.
2.疑问句 Must I „?
Yes, you must.(一定)
No, you needn’t./ you don’t have to.(不必) Do you have to go today?
Yes, we do.
否定句：You don’t have to worry about that.
四、need与dare的用法对比表
对比点 need dare
1.情态动词+动词原形
1)否定式
2)疑问式 He need not (needn’t)go.
----Need we do it again?
---No, you needn’t do it again. He dare not say so. 2
Dare she go out alone at night?
How dare you say I’m unfair?
If he dare do that, he’ll be punished.(条件句)
I dare say.(固定用法)
2.行为动词+带to不定式
1)肯定式
2)否定式
3)疑问式 He needs to go.
He doesn’t (does not)need to go.
Does he need to do it again?
No, he doesn’t need ot do it again. He dares to say.
He does not(doesn’t)dare to say.
If you dare to jump into the water from here, so dare I .
3. did not need to do
表示过去没有必要做 She didn’t need to attend the meeting yesterday, and she stayed with her children.(她没有参加)
五、should与ought to用法对比表
对比点 should ought to
1、表“应该” 表劝告、建议
You should listen to the doctor’s advice.
We should learn from Zhang Hua 表示“有责任有必要”做某事
You ought to finish your work before you go home.
We ought to help each other.
2、表“估计”
They should get home by now. 表示“非常可能”的事，可译为“总应该”
If we start to work right now, we ought to finish it before lunch.(午饭前应当能干完)
注： 1)、should还可在虚拟语气中的使用
2). 注意：ought to的疑问式及否定式
----Ought he to go? ----Yes, I think he ought to.
No, he oughtn’t to.
否定式：ought not to a或oughtn’t to do(不说ought to not do)
反疑问句：oughtn’t ______?
六、shall与will的用法对比表
shall Will
1. 征询对方意见或请求指示，用于第
一、三人称：
Shall I (we)„?
Shall he (she)„? Where shall I (we)wait for you? 1. 询问对方的意思或向对方提出要求：
Will you(please)„? Won’t you„?
Would you like to„?(用would替代will更客气)
----Won’t you go and see the film?你不去看电影吗?---Yes, I think I will. 不， 我想去。
2. 表示说话人的“意愿”有“命令”“警告”“强制”“允诺”“决心”等，用于第
二、三人称，要重读。
You shall do what I tell you ( to do).
我叫你干什么你就干什么。
Everything shall be done to save the ship.
一定要竭尽全力来拯救这艘船。 表示“意志”“意愿”，用于各种人称：
I won’t do anything you don’t like.
我不会做任何你不喜欢的事。
Would表示过去时间的“意志”“意愿”
Shylock would not take the money earlier.
夏洛克先前是不肯要钱的。
七：used to与would用法对比表
used to would
1.表示过去的动作、状态，重在与现在情况的对比，不一定要有时间状语。
I used to play cards a lot, but now I seldom play. 4
My hometown is not what it used to be. 1.只表示过去动作的重复，有明确的时间状语
I would go to see my grandfather on Sunday when he was in the middle school.
2.would 后只接表动作的动词，不接表认识或状态动词
He used to be nervous in the exam.
2.表示过去的习惯有时可互换：
When we were very young, we used to / would go skating every winter.
2. 表示过去的次数时，不能使用：
( √)We went to the Great Wall five times when we were young.
( X ) We used to go / would go to the Great Wall five times when we were young.
注：used to do的否定式：usedn’t to do 或didn’t use to do (usedn’t也可写作usen’t)
疑问式： Did you use to do ? Didn’t you use to do?
Used you to do? Usedn’t you to do?
情态动词表推测
情态动词表推测的意义：
1、大多数情态动词(除表‘能力、许可、意志’外)，都可以表示推测，其程度有差异。按其可能性程度的高低排列为： Must ﹥will ﹥would ﹥ought to ﹥ should ﹥ can ﹥ could﹥ may ﹥ might
肯定 完全可能 很可能 可能 有可能
2.注意区分情态动词的否定的含义：
may not或许不、可能不 might not可能不 can’t 不可能
mustn’t不许、禁止 shouldn’t不应该 needn’t 不必
3.情态动词表推测具体运用：情态动词可以对现在、进行、过去推测
S主+情态动词+be+adj 对“性质”“特征”的推测
S主+情态动词+be+n 对“职业”“事物”的推测
S主+情态动词+V原 对经常性行为的推测
S主+情态动词+be+V-ing 对进行着的行为的推测
S主+情态动词+have+PP 对过去的行为的推测
特别提醒：情态动词表推测时
1、 can只能用于否定句和疑问句
2、 must只能用于肯定句(它的否定句和疑问句其实就用can来代替了)
3、 如句中有情态动词 + 完成时，定是对过去的推测 。
4、 句中如有表示不肯定的话语，如：I am not sure; I don’t know 之类，常选may /might的各种形式
4. 记住下面几组表示反劝的特殊的表推测的形式
1). could + have + PP表示本来能做到，但事实上没有做到。 He could have finished the task on time, but the heavy snow came.
2). couldn’t +have + PP表示本来不能做到，但已经做到了。 She could not have covered the whole distance, but in fact she arrived ahead of time.
3) needn’t + have + pp表示本不必做的，但已经做到了。 She needn’t have attended the meeting yesterday, but she did.
4.) should/ought to +have + PP表示 该做而没有做 The plant is dead. I should/ought to have given ot more water.
5) shouldn’t/ oughtn’t to +have + PP表示 不该做而做了。 You oughtn’t to / shouldn’t have taken her bike without permission.
5. 记住下面对比：
must只能用于肯定句(它的否定句和疑问句其实就用can来代替了)
1.must + have + PP 表示对过去肯定的推测，译为“一定是，准是” The road is wet. It must have rained yesterday.
2.can + have + PP 表示对过去的推测(限于问句中) Can she have said so? 他可能这样说吗?
3.can’t + have + PP 表示对过去的否定推测 He cannot have said such a foolish thing.
情态动词表推测的反意疑问句
情态动词表推测的反意疑问句，简单来说，就是以情态动词后的时态为淮，如句子里有明确的时间状语，则以其为准。以 must 为例：
eg. 1. You must be hungry now, aren’t you?
2. He must be watching TV , isn’t he ?
3 Tom must have lived her for a long time, hasn’t he ?
4. She must have arrived yesterday, didn’t she?
注：如选择题中(以She must have arrived yesterday, didn’t she?为例)既有didn’t she又有hasn’t she则以didn’t she?为最佳答案
第三篇：情态动词专项
1.can
①(表能力)能…，会…
She can drive, but she can’t ride a bike.
A computer can’t think for itself.(不会思考)
②(可能，许可)能够…，可以…
The noise outside has stopped , now I can get down to my study.
--Can I use your telephone? --Yes, of course, you can.
You can go out to play when you do away with your homework.
③有时会…，偶尔…，
The climate of East China can be pretty cold in winter.
Jogging can be harmful for the health.
Even experienced teachers can make mistakes.
London could be rather cold in summer while I stayed there.
④(表温和的命令)请做…，得…
I’ll do the cooking, and you can do the washing.(请你去洗衣服)
You can go now.
⑤(表示猜测)可能…
Can he be working till so late?
Who can it be at this time of day?
Can it be Tom? No, it can’t be Tom.
He is busy these days, so he can’t come today.
can 与be able to 的区别：
The fire spread through the hotel very quickly, but everyone was able to get out.(强调设法干成某事)
2.shall
⑪用于一三人称的问句中，表示征求对方的意见
Shall I shut the window? Yes, please.
Shall she go to the concert with us this evening?
Shall they come in?
Shall we go out for a walk?
⑫用于二三人称 ，表示命令，允诺，警告，威胁，强制
①You shall go to the front at once.(命令)
②Don’t worry .You shall get the answer this afternoon.(允诺)
③I promise she shall get a nice present on her birthday. (允诺)
④He shall be punished. 威胁
⑤You shall listen to me. (命令)
⑥The interest(利益利润)shall be divided into five parts, according to the agreement made by both sides. (命令法规)
⑦It has been announced that candidates(候选人) shall remain in their seats until all the papers have been collected.(表按规定)
3.must
⑪必须
I must keep my word.
You must get up much earlier.
⑫不必needn’t/don’t have to
--Must I wash the dishes at once?
-- No, you needn’t./don’t have to.
⑬mustn’t 禁止，不许
You mustn’t play with the knife.
Cars mustn’t be parked here.
--May I use your pen?
--No, you mustn’t
⑭(表必然性)必定
Everyone must die.
⑮(表固执，不满等)偏要硬要
Our there-year-old boy must do the opposite to what we ordered.
Just when I was busy, the neighbor must come and chat.
Why must you be so stubborn(倔强的)?
If you must know, I’m going to help him look for an apartment.
4. should
⑪ 应该
You should apologize to him.
We should attend the meeting.
⑫ (表预期)按理会…， 想必会…，一定会…
The concert should be great fun.
The photos should be ready by 12:00.
The old man is always hunting the lions, so terrible things should happen to him. ⑬ (表惊讶，遗憾)竟然居然
I’m glad that your story should speak in such a way.
I wonder that a person like him should make such a mistake.
It’s a pity that he should resign.
⑭ (用于条件状语从句中)一旦，万一
If she should know the truth, she would be depressed.
If you should change your mind, let us know.
Ask him to call me up if you should see him.
⑮ (用于lest, for fear that, in case引导的句子)以免，唯恐
She gave me a list just in case I should forget what to buy.
He ran away lest he should be caught.
He gets up early for fear that he should miss it.
5. would
①(表过去的习惯行为)常常经常
When I was a child, I would often go skiing.
We would stay up all night talking about our future.
Every morninghe would go for a walk.
When he was here, he would go to that coffee shop at the corner after work everyday. 区别used to do sth过去常常
I use to be a waiter, but now a taxi driver.
There used to be a cinema here before the war.
Our country isn’t what it used to be.
②(表示说话者的厌烦焦躁)老是偏要
That’s exactly like Susie. She would come to me just when I was busy.
(老是在我忙碌时来找我)
I told him not to go, but he would not listen.(可他偏不听)
③ (用于if 从句)愿意乐意
If you would go there instead of me, I should be very glad.
如果你愿意代替我去那儿，我会很高兴的。
You could win if you would try要是你愿意尝试， 你会赢的
④ (用于否定句中，主语一般是事物，表某事物暂时的特性)就是不能 That window wouldn’t open.
That morning my car wouldn’t start.
When I called on him this morning, his dog wouldn’t let me in.
The door won’t open.
The car won’t start.
The doctor knows I won’t be operated on.
⑤ (表示推测)大概，大约
That would be his father .那大概设他父亲。
You would be about 10 years old then.你那时大概10岁。
It would be about ten when they left.
I thought she would have told you about it.
6.需特别注意：
①may well do sth =be very likely to do sth(很可能，完全能)
may as well do sth = had better do sth
② would like to have done
= would love to have done
= was/were to have done(本来想做…，本来打算做…)
③ had better have done sth(当时已做了…就好了)
④ must have done sth(肯定干过某事)
⑤ can have done sth可能已干过…
can’t have done sth不可能干过…，肯定没干过…
⑥could have done sth本来能够干 …，可能已干过…
⑦ may /might have done sth也许已经干过…，
⑧should have done sth
=ought to have done sth本来应该干…
⑨needn’t have done sth本不必做…
⑩would rather have done sth宁愿干过…
would rather not have done sth宁愿没干过…
好成绩是练出来的：
1.A left –luggage office is a place where bags ____ be left for a short time , especially at a railway station.
A shouldB canC must D will
2.How ___ you say that you really understand the whole story if you have covered only part of the article?
A canB mustC needD may
3.--There’s no light on.
--they ___ be at home.
A can’tB mustn’tC needn’tD shouldn’t
4.Some aspects of a pilots job ___ be boring ,and pilots often ___ work at in convenient hours.
A can, have toB may, canC have to, mayD ought to, must
5.He didn’t agree with me at first, but I ____ persuade him to sign the agreement later.
A couldB mightC ought to Dwas able to
6.If I ____ plan to do anything I wanted to, I’d like to go to Tibet and…
A wouldB couldC had toD ought to
7.The World Web is sometimes jokingly called the World Walt because it ___ be very slow.
A shouldB mustC will D can.
8.—Is Jack on duty today?
--It ___ be him. It’s his turn tomorrow.
A can’tB mustn’tC needn’tD won’t
9.I____ have been more than six years old when the accident happened.
A couldn’tB mustn’tC needn’tD shouldn’t
10.—I have taken someone else’s green sweater by mistake.
--It ___ Harry’s. He always wears green.
A has toB will beC must beD could be
11.You ____ be tired , you have only been working for an hour.
A can’tB mustn’tC may notD won’t
12.—Do you know where David is ?I couldn’t find him anywhere.
-- Well, he ___ have gone far. His coat is still here.
A can’tB mustn’tC may notD won’t
13.—Can I pay the bill by check?
-- Sorry, sir. But it is the payment shall be made in cash.
A shallB mustC will D can.
14.—Could I have a word with you, mum?
-- Oh, dear, if you ____.
A shouldB mustC may D can.
15.Naturally, after I told her what to do, my daughter ___ go and do the opposite.
A shouldB mustC may D can.
16.—Who is the girl standing over there?
--Well, if you ___ know, her name is Mabel.
A shallB mustC may D can.
17.John, look at the time.___ you play the piano at such a late hour?
A NeedB MustC May D Can.
18._____ you need any help, you can phone me at the office.
A WouldB ShouldC CouldD Had
19.—I’m afraid I will be too busy to go with you.
--Well, I’ll keep a seat for you in case you ___ change your mind.
A shouldB mayC will D can.
20.If anything __ happen to me, please give this letter to my head teacher.
A couldB mustC wouldD should
21.There is a real possibility that these animals could be frightened, ____ a sudden loud noise.
A being thereB should there beC there wasD there having been
22.—When can I come for the photos? I need them tomorrow afternoon.
-- They ___ be ready by 12:00.
A shouldB mightC need D can.
23.It’s nearly seven o’clock. Jack ___ be here at any moment.
A shouldB mustC need D can.
班级________姓名_____________
1-5 ___________________2-10___________________11-15_________________
16-20__________________21-23_______
第四篇：高三情态动词专项
1.Some people who don’t like to talk much are not necessarily shy;they___ just be quiet people.
A.must B.may C.should D.would
2.—Why____you be talking so loudly while others are studying?
–--I am terribly sorry.A.shall B.must C.will D.may
3.—Where will you start your work after graduation?
—Um,it’s not been decided yet.I_____continue my study for a higher degree.
A.must B.need C.would D.might
4.--___it be Tom that stole the manager’s mobile phone?
---No,as far as I know,Tom is very honest.A.May B.Can C.Must D.Should
5.Traffic safety is so important that everyone___take safety measures too seriously.
A.shouldn’t B.mustn’t C.cannot D.won’t
6.Peter____be really difficult at times even though he’s a nice person in general.
A.shall B.should C.can D.must
7.You can’t imagine that a well-behaved gentleman_____be so rude to a lady.
A.might B.need C.should D.would
8.---The work will take me another week.I’m really tired.
—I think you___ as well go to ask an experienced worker for some advice. A.may B.can C.need D.must
9.—That must be a mistake.
—No,it_____a mistake.A.must not beB.needn’t be C.cannot be D.would not be
10.He was a good runner so he__ escape from the police. A.might B.succeeded to C.would D.was able to
11.A dog ran in front of my mother’s car and she___ stop very quickly.
A.ought to B.had better C.must D.had to
12.I didn’t hear the phone.I____asleep.A.must be B.should be C.must have been D.should have been
13.---I saw Mr Sun at Tongyu Station this morning.
—You____.He’s still on holiday in Hawaii.
A.couldn’t have B.mustn’t have C.shouldn’t D.needn’t
14.--What has happened to George?
—I don’t know.He____lost.
A.can have got B.may have got C.might get D.could get
15.Many people___to his home as he keeps a big dog.
A.not dare go B.dare not go C.not dare to go D.dare not to go
16.I don’t think he could have done so much homework last night,____?
A.do I B.could he C.has he D.did he
17.You ___late for yesterday’s class meeting,as it was so important.
A.couldn’t be B.shouldn’ t beC.mustn’t have been D.oughtn’t to have been
18.—The Chinese athletes did extremely well in the Olympics.
—Yes,they____well,or they____ such great achievement.
A.must have been trained;couldn’t have gotB.must have trained;could have got
C.must have been trained;mustn’t have gotD.should have trained;couldn’t have got
19.As you know,although there are no classes on weekends now,no students___go out of the schoolwithout the headteacher’s permission.A.will B.must C.may D.shall
20.Many women___ a good salary,but they chose to stay at home for the family.
A.must make B.must have made C.should make D.could have made
21.—Why hasn’t Mr.Green showed up at the meeting yet?
—I’m not sure,but he___ in a traffic jam driving here.
A.could be caughtB.might be caughtC.might have been caught D.must have caught
第五篇：情态动词need用法小结
一、NEED与句子类型
(本条可参照ANY的用法。) NEED可用于：
1.否定句/含有否定意义的句子 1)否定句
含not/hardly/never/nobody等词语。 I needn’t say anything. He need hardly advise me. You never need tell me this or that. Nobody need help me. I don’t think he need come.(否定转移)
注：NEEDN’T的意思其实有三种，即不必要/不一定/不应该，视具体语境而定。 2)含有否定意义的句子
含only/but/all/before/than等词语。 He need only wait here. You need but consider the matter to understand its importance. That’s all that need be said.
Do not stay longer than you need. There was another hour before I need go out into the cold. 2.疑问句/表示疑问的从句 1)疑问句(包括否定疑问句) Need he say it again? 2)表示疑问的从句
I wonder whether/if I need see her. 3.条件句
含if/unless等词。
If he need come, he will. 本条要点简单概括起来就是，NEED不能用于肯定句。以下的各种用法也遵循这条规则。
二、NEED与时态 1.现在时
NEED常用于现在时。 You needn’t stay. 2.将来时
You needn’t have your blood pressure taken tomorrow. 3.过去时
NEED的过去式仍然是NEED。 1)过去时间由一过去时间状语表示 He need not come yesterday. 2)过去时间由另一过去时动词表示。 All he need do was to inquire. It was clear that he need never trouble to get up at seven again. I told him he needn’t be in a terrible fix. 注：表示过去的NEED常用于间接引语中。 (本条可参照must的用法)
三、NEED与虚拟语气 1)NEED用于虚拟条件句
(本条可参照虚拟条件句的构成及用法。) If money were useless, we need not struggle for it. If you had been careful enough, you need not have suffered. 注：本条用法较为少见。
2)NEED单独使用：NEEDN’T HAVE DONE (本条可参照SHOULDN’T HAVE DONE的用法。) You need not have worried. 注：NEED HAVE DONE的形式较为少见
Need you have scolded him so severely for his bad work? He had done his best.(否定意味)
He need have gone and sent that letter in person.(实际上没有做)
四、NEED与推测
NEEDN’T表示“不一定”。 (本条可参照must/can的用法。) 1) NEEDN’T+BE
It needn’t be hot in Florida now. 对比：
It can’t be hot in Florida now.(一定不) It must be hot in Florida now.(一定) 2) NEEDN’T+HAVE DONE
He need not have seen much of the world, though he is an old man. 对比：
He can’t have seen much of the world, for he is just a little boy. He must have seen much of the world, for he has been traveling so widely.
五、NEED与问句 1)反意疑问句的构成 You needn’t go, need you? 2)答句的构成 --- Need he go? --- Yes, he must/has to/needs to. --- No, he needn’t.
(本条可参照must的用法)
六、情态动词NEED与实义动词NEED 1)使用范围
作为实义动词的NEED有人称、数和时态的变化，使用范围更为广泛，不受句子类型和时态的限制。在肯定句、过去时和将来时的句子中，一般使用作为实义动词的NEED。
He needs to see a doctor straightaway.(此处needs to不能换做need，因为本句是肯定句)
Will he need to start earlier? 注：
NEED TO BE DONE与NEED DOING可以互换，后者更为常用(这里的NEED均为实义动词)。 2)含义差别
NEEDN’T HAVE DONE与DIDN’T NEED TO DO表示“不必要”的时候，在意义上有所差别，前者表示“本不必做„„”，实际上已经做了(NEED为情态动词);后者单纯地表示“不必做„„”(NEED为实义动词)。