情态动词表推测用法总结及专项练习

1、学习必备欢迎下载情态动词表估计用法总结及专项练习1. can / could用于表估计的用法(1) 从使用句型上看， can 通常只用于否定句或疑问句，一般不用于确定句，而 could 可用于确定句、否定句和疑问句；两者没有时间上的差别，只是 could 比 can 更委婉，更不确定；如：it can t couldn t be那tr不ue可.能是真的；what can could they be doing.他们会在干什么呢 .we could go there this summer.今年夏天我们可能要去那儿；注：can有时也用于确定句中表示估计，主要用于表示理论上的可能性 即从理论上看是

2、可能的，但实际未必会发生，或表示 “有时 ”之意；如：even experienced teachers can make mistakes.即使是有体会的老师也可能出错；she can be very unpleasant.她有时很令人厌恶；(2) 从时间关系看，对现在或将来情形作估计，后接动词原形； 对正在进行的情形作估计，后接bedoing结构；对过去情形作估计，后接动词完成式；如：he could have gone home.他可能已经回家了；he can t couldn t have understo他od不.可能懂得了；学习必备欢迎下载why does he know this

3、. can could someone have told him about it.他怎么知道 .会是哪个人告知他了吗 .(3) “ coul完d+成式 ”除表示对过去的估计外，仍有以下重要用法： 表示过去没有实现的可能性，常译为“原来可以 ”；如：i could have lent you the money why didn t you ask me.我原来可以借这笔钱给你的；你为什么不向我提出. 用来委婉地批判某人过去应当做某事而没有去做，常译为“原来应当 ”；如：you could have helped him.你原来应当帮忙他的； 表示“差点儿就要 ”；如：i could hav

4、e died laughing.我差点儿笑死了；2. may / might用于表估计的用法表示估计，两者都可用，只是might比 may语气更不确定，表示的可能性更小；(1) 在句型使用方面：两者均可用于确定句和否定句，但用于疑 问句时， may 通常不用于句首，但可用于疑问句的句中（如特别疑问句等），而 might 尽管可以用于疑问句的句首，但不算一般，通常会改用其他句式（如用could 等）；如：he may might know the answer.他可能知道答案；学习必备欢迎下载he may might not believe you.他可能不会信任你；and who may mi

5、ght she be.那么她会是哪一位呢？(2) 从时间关系看，对现在或将来情形作估计，后接动词原形； 对正在进行的情形作估计，后接bedoing结构；对过去情形作估计，后接动词完成式；如：he may might tell his wife.他或许会告知他妻子；he may might be writing a letter.他可能在写信；she may might have read it in the papers.她可能在报上已读到过此事；(3) “ migh完t+ 成式 ”除表示对过去的估计外，仍有以下重要用法： 表示过去某事可能发生而实际上却并没发生；如：it was really

6、 very dangerous. i might have killed myself.那真的是太危急了，我差点没命了；a lot of men died who might have been saved很多人原来可以获救的却死了； 表示委婉的批判或批判；如：youmighthavemadegreaterprogress.你的进步原来可更大一些的；学习必备欢迎下载you might at least have answered my letter.你至少可以回我一封信嘛；3. must表示估计的用法must表示很有把握的估计，其意为“肯定会 ”肯“定会 ”，只用于确定句，一般不用于否定句或疑

7、问句；表示对现在或将来的情形作推测，后接动词原形；表示对过去情形的估计，接动词完成式；如：i must be the happiest woman on earth.我肯定是世界上最幸福的女人了；no, he must be lying.不，他肯定在撒谎he must have mistaken my meaning.他肯定误会了我的意思；4. should have done的用法should have done 只用于谈论过去情形，主要有两个用法：一是用于估计过去已经发生的情形 ，二是用于指本该发生而实际上未发生的情形；如：you should have told me so before

8、.你早就应当告知我；he should have arrived by now.此时他本该到了；lookatthetime.weshouldhavebeenatthetheatreten minutes ago.瞧都什么时候了 .特别钟前我们就该到戏院了；5. need have done的用法学习必备欢迎下载need have done结构主要用于否定句或疑问句，一般不用于确定句；用于否定句时，表示原来不必做某事，但实际上却做了；用于疑 问句时，用于询问某一过去动作的必要性；如：you needn t have hurried. 你当时实在不必那么匆忙；she needn t have co

9、me in personaletter would have beenenough.她本不必亲自来 写封信来就足够了；need you have paid so much.你当时真必要付那么多钱吗.needtheyhavesoldthefarm.他们那时非得把农场卖掉不行吗.历届 nmet中表估计的情态动词的用法情态动词是中学英语学习中的一个重点和难点，也是高考的重点考察内容之一 ；其中表示估计用法的情态动词在近几年的高考中更是屡见不鲜；现结合近几年的高考题目，对表估计的情态动词的用法作一归纳，期望对各位考生会有所帮忙：【考例】 1.naturally,afteri toldher what

10、todo, mydaughter go and do the opposite.a. may b. can c. must d. should2003年一般高等学校春季招生统一招生考试英语试题（安徽卷）【分析】can,may,must都可用来表示 ”估计 ”，但侧重点各有不同：学习必备欢迎下载may 常用来指 ”事实上的可能性 ”，而 can就表示一种 ”理论上的可能性”例如：the railways may be improved.=it is possible that the railways will be improved.=perhaps/maybe/possibly the ra

11、ilways will be improved.铁路可能会得到改进；（意味着已有详细的改进方案或方案；）the railways can be improved.=it is possible for the railways to be improved.铁路可以得到改进；（意思是铁路仍不完善，尚有问题存在；）理论上的可能性 can 比事实上的可能性 may 更弱；在一般的陈述句， can与 sometimes几乎相同，表示一种偶然的可能性；比如：evenexpertdriverscanmakemistakes.甚至是很娴熟的驾驶员也可能会犯错；=even expert drivers so

12、metimes make mistakes.=it is possible for the expert drivers to make mistakes.因此，假如讲的是一种特别情形，不是一般情形，就用may, 试比较：mr reed looks pale.he may be ill.mr reed is in poor health.he can be ill at any time.must指规律必定 ,作“想必”、“准是”、“肯定 ”解，用来表示我们对某事有把握的推论或揣测 ；（考虑到迹象如此 ，再无别的结论 =it seemscertain that）.:学习必备欢迎下载they m

13、ust be very tired now, for they have been working the whole morning.他们现在肯定是特别累了，由于他们整个上午都在工作；析：填c.must ；意思是 ”不出所料，当我告知女儿要做的事时，她准会去做相反的事； ”【考例】 1、mary be in paris.i saw her in town only a few minutes ago.nmet1994a.mustnt b.shouldnt c.cantd.may not2、.-is john coming by train. nmet 2002 tianjing -he sh

14、ould,but he not.he likes driving his car.a must b.can c.need d.may【分析】 may用于否定时， not不是否定 may ，而是否定句中的动词，这一点与 can不同，试比较：hemaynotknowthetruth.他可能不知道事情的真相；（=itis possible that he didn t know the truth）.he cannot know the truth.他不行能知道事情的真相；must表示估计的这种用法通常用在确定句中，在疑问句中常用can 可能 ，在否定句中常用can t不可能，不会是 ，而不用mus

15、tnt；例如：- somebody is knocking at the door. who can it be . it must be wang hong.-no,it canbte wanghong,becauseshe leftforshanghai学习必备欢迎下载this morning.- 有人在敲门；会是谁呢？肯定是王红；- 不，不会是王红，由于她今日早晨就动身去上海了；因而 you must be joking.在意义上相当于you cant be serious.析：1、填 c；意思是 ”玛丽不行能在巴黎；几分钟前我仍观察她在镇上；2、填 d；意思是 ”-约翰会坐火车来吗？

16、-应当会，但他可能不会；他喜爱开车； ”【考例】 1.-iheardtheywentskiinginthemountainslast winter. nmet 2002beijing -it true because there was little snow there.a.may not be b.won't be c.couldn't bed.mustn't be【分析】 could,might表示过去的可能性；i thought it might be true.我本认为那是真的；he could be very unreasonable.他有时可能毫不讲理；析

17、：填 c；它是对去年冬天所发生的事进行评判；【考例】 1.- are you coming to jeffs party. nmet 2000-i m not sure.i go to the concert instead.a. mustb.wouldc.shouldd.might 2.-look.the clouds are gathering.-yes.i'm afraid it be pouring down soon.a,can b,must c,should d,might【分析】 could和 might表示现在的情形时，更带有不愿定性和慎学习必备欢迎下载重味道，构成礼貌

18、或动听说法，包含或许的意思：a:iwonderwheretomis.b:hemay/might/couldbeinthe library.perhaps he is in the library.因 此 在wonder,fear,beafraid等 后 接 的 从 句 中 , 通 常 用may/might/could,表达一种探询的观点：i was afraid you might be out of sorts.我怕你可能心情不爽快；假设性的可能和摸索性的可能，也用could和 might ：ourteammightstillwintherace.可 以 意 译 为 ： itis possi

19、ble,though unlikely,that析： 1、2 均填 d.might【考例】 mr. bush is on time for everything. how itbethathewaslatefortheopeningceremony.a can b shouldcmayd must2001年上海一般高校春季招生考试试卷【分析】表示估计的 may 通常不用于一般疑问句 ，而要用 can代替；can 用于一般疑问句时，仍可表示惊奇或怀疑，意思是”（到底）可能有这样的事吗？ ”，比如：“ there is the doorbell.” who can it be at this ti

20、me of day. 有”人按门铃； ”这个时候到底会是谁呢？”must也有时用于疑问句： musttherebesomegoodreasonfor thedelay.这个问句设想的是一个确定的回答，可以说明为” does there have to be some good reason.”学习必备欢迎下载may可用于特别疑问句或wh- 从句，意思是 ”（到底）是”、”不知是否”：i wonder what it may mean.我不知道这到底是什么意思；how old may his father be.他父亲到底有多大年纪？ （比 how old is his father.委婉的说法

21、；）析：填 1、a.can. （布什先生做什么事都很按时；他怎么可能会在开幕式上迟到呢？）【考例】 1. sorry i'm late. i have turned off the alarmclock and gone back to sleep again. 2000年一般高等学校春季招生考试北京、安徽卷 a. mightb.shouldc.cand. will2. there werealreadyfivepeopleinthecarbutthey managed to take me as well.it a comfortable journey. nmet95a. can&

22、#39;tbeb.shouldn'tbec.mustn'thavebeen d.couldn't have been【分析】 “情态动词 have + -ed分词”结构可以表示对已发生的事情进行估计 ,就表示的可能性程度而言 ，must最大，could其次，may 更次之， might最小；must+ have+-ed 分词:用于确定句 ,表示估计过去某事 “确定,肯定，准是 ”发生了；其否定形式为： cant / couldnt hav-eedv,表学习必备欢迎下载示过去不行能发生某事； maymight + have + -ed 分词: 用于确定句和其他否定句 ,

23、表示对已发生事情的不愿定的估计 , 意为 “可能 , 大致”,其中 might 较 may 语气更弱 , 把握更小；can/could 用于否定或疑问句中 ,表示对过去发生的大事的 “怀疑或不愿定 ”；could 比can 更表示说话人语气的不愿定；例如：i mailed that letter a week ago. he must have received it.我一周前就发出了那封信 ,想必他肯定收到了；i can t find my keys. i may / might have left them at theschool yesterday.jackcan thavearriv

24、edyet,otherwisehewouldhavetelephoned me.（上海 1997 ）it couldn't have been mr. smith. he has gone to china.不太可能是史密斯先生；他已去了中国；另外，留意 may 不行用于疑问句，它的这种功能已为 can 所取代；例如 can they have missed the bus. 的答句是： yes,they may have done. 而不是 yes,they can have done. 这一点要留意；must有时也能用于否定句：hisabsencemustnothavebeen n

25、oticed.此句和 his absence can t have been noticed. 的意思是一样的；很多评论者认为这类句子是不行能成立的，但它们正在为越我 来越多的人所接受和使用，在美国英语中特别如此；对正在发生的事情进行估计，就采纳”情态动词 +be+ 现在分词 ”结构，其中情态动词的区分与上相同；学习必备欢迎下载析：答案 a、d；can通常不用于确定句表推测； ”should+have+ -ed分词 ”表示 ”过去原来应当做”，但实际上没有做，意思是”本该.”，带有批判口气:iwasreallyanxiousaboutyou.you shouldn thaveleftwitho

26、utaword. nmet2001；” will+have+ -ed 分词 ”只是将来完成时的一种形式；【考例】 1.it'snearlyseveno'clock.jack behereatany moment. nmet95a. mustb.needc.shouldd.can【分析】 shouldought to表示很可能、预期的意思，指一种尝试性推论，可认为是must的语气较弱的对应词，意思是”应当会、肯定；吧 ”；试比较：our guests must be home by now. i am certain我们的客人现在肯定到家了 ；（依据他们动身的时间 、路程远近、速

27、度等详细条件，我能确定 /确定他们现在已经到家了；）our guests shouldought to be homeby now. they probably are,but i m not certain我. 们的客人现在该到家了； （含义是我想他们很可能到家了，但我不能确定 ”）与 must 不同仍在于它经常表示将来：-whencanafternoon.icomeforthephotos.ineedthemtomorrow-they bereadyby12:00.nmet1998a.canb.should学习必备欢迎下载c. might d.need表示不太可能可用shouldn tou

28、ghtnt to:thereshouldn toughtntotbeanydifficulties.不该有任何困难；析：填 c；意思是 ”将近七点了；杰克很可能随时会到；”另外，在近几年的 nmet中，对情态动词及其它语法项目的考查均放到肯定的语境中进行 ，要求考生利用所学英语各项基础学问进行初步的语言运用，而不再是单纯的语法学问题和短语题；这类试题往往通过题干 的其他部分或附加句子供应某个信息，然后让考生依据这个信息进行合理推理，产生新的想法和熟识；因此，在做这类题时，除要熟识所 考查的语法规章外，仍要仔细分析句子的结构，留意抓住关键词，分析上下文的规律关系；不能单凭语法规章做题；巩固练习1

29、. michael be apoliceman, for he's much too short.a. need'tb. can'tc. shouldd .may 2.johnny,you play with the knife. you hurt youself.a.won't,can'tb.mustn't,mayc.shouldn't,mustd.cant't,shouldn't 3.peter come with us tonight,but taken he isn't very sure yet.a.ca

30、n b.may c.will d.must4. put on more clothes.you be taken feeling cold with only a shirt on.学习必备欢迎下载a. must b.can c.could d.would5. it's nearly seven o'clock.jack be here at any moment. a.must b.need c.should d.can6.i didn't hear the phone.i asleep.a.must be b.must have been c.should be d

31、.should have been 7.jack yet,otherwise he would have telephoned me.a.mustn'thave arrivedb.shouldn'thave arrivedc.can't have arrived d.need not have arrived8.-there were already five people in the car but they managed to take me as well. -it a comfortable journey.a.can't be b.shouldn&

32、#39;t be c.mustn't have been d.couldn't have been 9.he you more help,even though he was very busy.a.might have given b.might give c.may have given d.may give 10.yesterday jane waooked away from the discussion.otherwise,she something the would regret later.a.had said b.said c.might say d.migh

33、t have said 11.there was plenty of time.she .a.mustn't have hurried b.needn't have hurried c.should have writtenit out d.couldn't have hurried12.tom ought not to me your secret,but be meant no harm.a.have told b.tell c.be telling d.haven't told13.i told sally how to get there ,but pe

34、rhaps i for her.学习必备欢迎下载a.had to wirte it out b.must have written it out c.should have written it out d.ought to write it out14.if you had worked harder,you .a.wouldsucceed b.hadsucceeded c.shouldsucceed d.wouldhave succeeded15.-ifhe ,he thatfood.-luckilyhewsasenttothehospital immediately.a.was warn

35、ed;would not take b.had been warrned;had not taken c.would be warned;had not taken d.would have been warned;had not taken16.-istayed at a hotel whileinnew york.-oh,didyou.youwith barbara.a.could have stayed b.could stay c.would stay d.must have stayed 17.sorry i'm late.i have turned off the alarm and gone back to sleep again.a.might b.should c.can d.will18.-shallitelljohnaboutit.-noy