情态动词canmaymustneed及练习

1、考点二：情态动词can的用法.表示某人能做某事。肯定句：主语+can+动词原形+其他I can play the piano 否泄句：主语+can +not （can* t）+动词原形+其他I can not （can* t） play the piano 一般疑问句：Can +主语+动词原形+其他？Can you play the piano?特殊疑问句：特殊疑问词+ can +主语+动词原形+其他？What can you play ?can play the piano情态动词 must, can, could, may, might表推测的用法：情态动词中的must, can, cou

2、ld, may, might都表推测。其中must的可能性最大，can / could次之，may / might最小。具体用法如下：1. must的用法（1）表示推测“可能性”时，意思是“一泄、准是”，语气较肯立，较有把握。He must be American 二 It is certain that he is American他乳丰是个美国人。（2）must表推测只能用于肯窪句。如果要表示“一圧不.肯泄不”的意思时，应用can't,如询问某种可能时，应用He must know my address 他肯左知道我的地址。（一左）He can t know my address

3、他肯立不知逍我的地址。（一泄不）Can he know my address? 他知道我的地址吗？（询问可能性）（3）must表示推测时，可以推测现在/正在发生的动作/过去发生的动作。He must have a car now.（现在）他一泄有辆小汽车。He must be doing his exercises 室里做练习。He must have finished the work 注： must表示推测时很少用于将来的情况。 It s certain / I'm sure that hein the classroom.（正在进彳亍）他一泄在教（过去发生）他一立已完成了工作。一

4、般不用 He must come tomorrow.可用will come tomorrow（4）在反意疑问句中，当附属部分含有表示推测意义的must时，疑问部分的助动词应与 must 后面的动词在非推测情况下的用法保持一致匚He must be a worker, isn't he?（现在）他准时个工人，是吗？It must have rained last night, didn't it?（过去）昨晚一楚下雨了，是 不是？You must have learned English for many years, haven't you? （完成 H 寸） 你一定学

5、了好多年英语，是吗？2. can / could的用法（1） can表示推测''可能性”时，往往用于否泄句或疑问句。 Can't “一泄不”，语气很肯泄。can在疑问句中意思是“会、可能”。He can t be at home 二 It is impossible that he is at home 他一 定不在家。（2）can /can't后可接进行时/完成时，表示对现在发生的动作或过去发生的动作进行推 测。They can't be reading in the library. 他们一左不在图书馆读书He can t have gone to

6、Shanghai for I saw him a minute ago.他不可能去了，我刚才还看见他。It's so late. Where can she have gone? 天晚了，她可能去哪儿了呢？（3）在反意疑问句中，当述部分含有表示推测意义的can't时，疑问部分的助动词应与can't 后而的动词在非推测情况下的用法保持一致.He can't be a teacher, is he? 他不是教师，是吗？She can t have finished her homework, has she? 她一左没有完成家庭作 业，是不是？（4）could可用于

7、表示某事有可能发生或可能是事实。Don't eat it. It could be poisonous 不要吃它，可能有毒。The plane could be delayed by fog. 飞机可能会因为雾晚点。（5> could还可以用于表示客气、委婉、礼貌的请求语气。Excuse me, could you tell me the way to the bus station? Could y ou help me?（6） couldn't表示否泄推测，表示某事不可能真实，或由于特立事实或环境某事肯定不会 发生。It couldn't possibly b

8、e poison.这不可能是毒药。注：有时与形容词的比较级连用强调某人或某物不可能再更多地具有某种属性。You couldn't be more wrong. 你真是大错特错。I couldn't be happier 我简直是幸福极了。3. may和might的用法（1）may, might表示推测“可能性”时，意思是“可能”、“也许”，语气没有must 冃疋QHe may / might be American 二 It is possible that he is America n.他可能是个美国人。注：might不表示过去时态，只是语气上比may更委婉，表示的可能性更

9、小。（2）may, might表推测时，可以用于否泄句，意思是"可能不、也许不”，但不用于疑问 句。He may / might not be at home 他也许不在家。（3）may, might可以推测现在正在发生的动作或过去发生的动作。He may / might be sleeping now. 现在）他可能正在睡觉。The boy may / might not be watching TV at home.（现在）这个男孩可能没在家看电视These students may / might have seen the film before（过去）这些学 生以前可能看过

10、这部电影。（4）may, might还可以推测将来的情况。I think we should take raincoat with us, it may rain 我想我们应 该带上雨衣，可能要下雨了。She might not come this afternoon 她今天下午可能不来了。Exercises： Complete the sentences using "must” or ucan tM 1. I have tried tocall him at theoffice,butthere isno repl yHe be at home2. They have bough

11、ta new car Theyhave alotof money 3.Sheiscarrying aJapanesenewspaper She beChinese4.Hegoesabroad alot, Hehave an importantjob.5.Sheisa professorat theuniversity She bevery clever6.Sheisacting ina Shakespeare play tomorrowShe be an actress.【随堂练习】一.选择填空1 I thought youlike something to read.SoI have bro

12、ught you some book.A. oughtB mightC couldD must2.-That man must beSarah s husband.No, he.be herhusband She isstill single.A.can tB.mustn tC.may notD.ought toA.4.3. Petercome with ustonight,buthe isn tverysure.must-WhatItB mayC canit be?be a mailbox,D.itwillis moving Ita car.A. can; can t; mustB can;

13、 can; must5.-Look,someoneis coming GuessJackHe'<5 alwayson timeA.whocanit beB whohe mayC.whohecan beD whoit can be6.-IsawMary inthe libraryyesterdayYouher Sheis still abroadA.mustn'tseeB can'thave seenC can; mustn t; mustC.mustn't have seenD couldn t seeD must; mustn't; can7 D

14、avid, youplay withthe valuablebottle,youbreak it.A won t; can t B mustn't; mayC shouldn t; must D can't; shouldn't8. Susan refuses to marry Jack now. She her mind.A. must change B should have changedC must have changed D would have changed9. Suecome together with us tonight, but sheisn t

15、 very sureyet.A. must B may C need D will10. Aunt Margaret.the rain, otherwise she wouldhave arrived herA.C.1.A.2.A.3.bynow.must have missed B.had missed D mightshouldmissWho is the man over there? Is it It him, but I am notmay beB maybeC isSome people:mustB shouldMust I go to medical school son You

16、' B mustn* tNo, youA. can* thave to 考点：考査情态动词辨析。4.A.5.A.have missedMr. Wu?quite sureD must befeel sick when they read a book inC mayD needand be doctor like you. Dad? re free to make your own decisionC shouldn* tD don' ta car or on a boatYoushould B must C need to D ought toCould you please

17、the piano so loudly? Your brother is having a rest now.not to playB not playC don' t playD.not playThat pink T-shirt with Ping An* s picture on itbe hungry after thelong walk Help yourself to some cakes.to6.admires him a lotNo, it _A. must, canbelong to Miss Ha. She7Must I answerNo, you A. shoul

18、dn* t8. weOh, no. It'be hersB may,it inShe hates pink colourC can, mustn" t D.can tEnglish?must, mustnYou can use Chinese.B can' tgo swimming in coldA. W订 1; veryB. Will; too9. People who drink wine A dor/ t allow B isn' t allowedC mustn' tXishuanghu Lake today? to swim on such

19、days IShall; veryD needn' tC.to driveC mustn?will catch a cold.D Shall; too10. I was asked to attend the meeting before一Oh, youA must11 You haveA. mustmustn' t12 Can Iafter May Day.t allow D mustn? t be allowed eight. Im sorry for not telling you thatB can'tC mayDworked for a long time Y

20、ou _B. canwe have changed the plan. needn? tbe very tiredC couldD.ask you a question?No, you You to ask me questions during examsA. can* t, mustn* tB can" t, aren* t supposedC can, aren* t supposedD can, don* t have13 What you do if you in Grade 7 now?A. could, are B would, are C could, was D w

21、ould, were【答案】D14 This CD belong to Bil 1 It has his name on it.A mustn' tB mightC can' tD must【答案】D15 You drive your car so fast It' s dangerousA. wouldn* tB shouldn， tC couldn? tD mightn， t【答案】B16.Shall we meet at the station at 8 a.m?In fact we The train until 10a mA. mustn' t ;do

22、esn' t leave Bmustn' t ;leavesCneedn* t :won* t leave Dneedn* t;will leave【答案】c17 Mum, I watch TV?No. Unless your homework A. could; finishesB can; will finishC may; is finishedD can; will be finished【答案】c18-Look! A man is cutting a tree on the moon一一It be true The teacher said there is no a

23、ir on the moonA. can' tB may notC shouldn， tD mustn' t【答案】A19. you please play tennis with me? Sorry, I A. Could; can* tB Could; couldn* t C Can; don' t DCan;couldn， t【答案】A20 I broke the windowYouplay football near the windowA. shouldB shouldn*tC had better【答案】B21一you swim?Yes, but I'

24、; m not a goodswimmerA. CanB. HayC. NeedD Must【答案】A22. Is the woman over there Miss White?It be her She* s gone to Hangzhou.A mustB can' tC needn' tD may【答案】B23 一Can your friend sing?一一A. Yes, I can B Yes, he can C No, she can D No, I can" t【答案】B24Where is Kate ?she is cleaning the clas

25、sroomA. MayB May beC.MaybeD Can【答案】c【解析】25 Shecome to the party, but Iam not quite sureA. wouldB shouldC mightD must【答案】C26Are you coming to Davys party, Kate ?I' m not sure, I go to the movies insteadA wouldB shouldC mightD must【答案】c27. It's the library! So you make any noise hereA. mustn，t

26、 B won' tC needD may【答案】A【解析】28 Look at the sign! It says "No Smoking! ° Yousmoke here It' s dangerous.A mustn" tB ought not to C needn" tD don' t have to【答案】A29 -May I watch TV now, Mum?-No, you You do your homework firstA. don* t; mustB don't; can t C： can't

27、, mustD can't; can【答案】c30There * s somebody at the door Who it be? Is it the postman ?No, it be him It' s just seven o* clock It' s too earlyA. may, can' tB wi 11, won* tC.may, mustn' tD must, may not【答案】A31 -you sing an English song?- Yes, I can.A. CanB. MayC. MustD. Need【答案】A32. Is John coming by