高二英语高二英语情态动词.ppt

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1、情态动词用法小结（复习）情态动词用法小结（复习）一、各个情态动词用法归纳一、各个情态动词用法归纳 can和和 could 1.表示表示“能力能力”I can swim,but my sister cant.2表示表示“许可许可”、“请求请求”Can I go with you?(请求请求)Father said I could go to cinema.(表示过去的许可表示过去的许可)You cannot smoke in the meeting room.(cannot 表示表示“禁止禁止”)Could I use your phone?Yes,of course you can.肯定回答，

2、不能用肯定回答，不能用could，一般是，一般是Yes,please.Thanks.3表示表示“理论上或逻辑上的可能理论上或逻辑上的可能”Anybody can make mistakes.(只表示理论上的可能性只表示理论上的可能性)An accident can happen if you do this.(表示事情肯定会发生表示事情肯定会发生)4“猜测猜测”（主要用于否定句和疑问句（主要用于否定句和疑问句）：He cant be at home.(否定句否定句)Can the news be true?(疑问句疑问句)更多资源更多资源 与与be able to 的区别：的区别：can 只有

3、现在和过去时态，强调能力；只有现在和过去时态，强调能力；be able to有各种时态，表示有各种时态，表示一时一时的能力，强调结果。的能力，强调结果。Mary can play the piano.She has been able to play it since she was 5.Yesterday I was able to get home before the heavy rain.may 和和might1表示表示“许可许可”You may take a walk.Students may not make noise in the library.(may not 表示不许可或

4、禁止表示不许可或禁止)May I come in?否定回答否定回答No,you mustnt./cannot.也可以也可以 may not 肯定回答肯定回答sure,certainly,of course Might I trouble you for a light?You may indeed.2.表示表示事实上的可能性事实上的可能性 It may rain tomorrow.(表示可能会发生表示可能会发生)Electric irons could be dangerous,they might give you a severe shock.3.“预测预测”Sam might have

5、taken the money,but it seems unlikely.must1.表示表示“必须必须”、“务必务必”：We must obey orders.Must I pay now?肯定回答肯定回答 Yes,you must 否定回答否定回答 No,you neednt 或或 No,you dont have to2.表示表示预测预测(必定，必会必定，必会)一般用于肯定句。可用于否定一般疑问句。一般用于肯定句。可用于否定一般疑问句。There must be a mistake.Mustnt there be another reason for his behavior?3.偏偏

6、偏偏 Our boy must do the opposite to what we ordered.Just when I was busy,she must come and chatshall1.用于第一、三人称，表示征求对方的意见用于第一、三人称，表示征求对方的意见 Shall we talk?Shall he come to see you?2.用于第二、三人称，表示用于第二、三人称，表示命令、允诺、警告、决心命令、允诺、警告、决心等等 Each member shall wear a name card.No one shall stop me.You shall have the

7、 book when I finish reading it.He shall get his allowance.Should1.表示表示“必须必须”：I should answer his letter as soon as possible.You shouldnt judge a man always by the clothes.(shouldnt劝告劝告)2.猜测，猜测，“估计估计 应该应该”That should be Janet coming upstairs now.正在上楼的该是珍妮正在上楼的该是珍妮特。特。Will和和 Would1.表示表示“意愿意愿”I will ca

8、ll you as soon as possible.Who will do the job?He would not let me try.2.表示表示“请求请求”Will you kindly tell me the way to the post office?Would you give me your address?(用用 would 比比 will 表示更客气表示更客气)3.表示表示“预测预测”或或“习惯性习惯性”：That would be his mother.(would be 表示肯定是表示肯定是)He will sit there hour after hour loo

9、king at the river.He would come to see me when he was in London.used to 与与would的区别的区别used to表示过去情况与现在不同表示过去情况与现在不同;would只单纯表示过去的情况只单纯表示过去的情况People used to think that the earth was flat.She would go out for a walk in the morning when she was in the country.ought to1.表示表示“应该应该”You ought to go to see t

10、he doctor.(ought to 的语气比的语气比must 弱弱)You oughtnt(ought not)to smoke so much.Ought you to smoke so much?2.表示表示“预测预测”，婉转，婉转,比比must语气弱语气弱 They ought to be there by now.should 和和ought to的区别的区别含义大致相同，含义大致相同，ought to 强调在客观上（法律，章程和道义），比强调在客观上（法律，章程和道义），比should语气强。语气强。should强调主观上，表示主语的职责和义务或说话人的劝告强调主观上，表示主语的

11、职责和义务或说话人的劝告。You ought to go and see Mary tomorrow.You shouldnt judge a man always by the clothes.need和和dare用作情态动词时，主要用在否定句、疑问句中，用作实义动词时用作情态动词时，主要用在否定句、疑问句中，用作实义动词时,可用于各种句式可用于各种句式。Need I come?Yes,you must./No,you neednt.You neednt telephone him now.She dare not go out alone at night.We should dare t

12、o give our own opinion.We need to tell them the news.注意：注意：dare用作实义动词时，其否定句中的用作实义动词时，其否定句中的to可保留也可省略。可保留也可省略。She doesnt dare to climb the tree.She doesnt dare climb the tree.二、情态动词的完成式和进行式二、情态动词的完成式和进行式modal verb+have done:对过去发生的事情进行评价、猜测，表示对过去发生的事情进行评价、猜测，表示“应当已经、想必已经、应当已经、想必已经、本本来可以做但未做来可以做但未做”I s

13、hould have finished the work earlier.He isnt here.He must have missed the train.Where can(could)he have gone?You could(might)have been more careful.You ought to have come,but why didnt you?modal verb+be doing:对正在发生的事情进行评价、猜测，表示对正在发生的事情进行评价、猜测，表示“想必正在、可能正在、想必正在、可能正在、应应当正在当正在”Its 12 oclock.They must b

14、e having lunch.They may be discussing the problem.He cant be telling the truth.She shouldnt be working like that.She is still so weak.情态动词专项练习情态动词专项练习1.I hear youve got a set of Australian coins.2.I have a look?3.Yes,certainly.A.Do B.May C.Shall D.Should2.He seldom listens to others.He answer for wh

15、at he has done.A.shall B.will C.can D.would3.May I leave the office before 5 oclock in the afternoon?No,Im afraid you .A.neednt B.shouldnt C.mustnt D.wont4.Shall I tell John about it?No,you .I dont know his telephone number.A.neednt B.wouldnt C.mustnt D.shouldnt5.Mr Bush is on time for everything.Ho

16、w it be that he was late for the opening ceremony?A.can B.should C.may D.mustACBAA6.The traffic light is red,so I stop my car.A.must B.have to C.can D.mustnt 7.What happened to the young trees we planted?The trees well,but I didnt water them.A.might grow B.neednt have grown C.would grow D.would have

17、 grown8.I was really anxious about you.You home without a word.A.mustnt leave B.shouldnt have left C.couldnt have left D.neednt leave9.Tom show his exam results to his parents.A.dare not B.dared C.dare to D.dares not to 10.She the film.She knows nothing about it.A.cant see B.cant have seen C.must se

18、e D.mustnt have seenBDBAB11.They must have been here the day before yesterday,?A.mustnt they B.didnt they C.mustnt have they D.had they12.I didnt see her yesterday.Oh,but you .A.must have B.ought to C.should have D.cannot have13.Must I take a bus?No,you .You can walk from here.A.must not B.dont C.do

19、nt have to D.had better not to14.Will you stay for lunch?Sorry,.My brother is coming to see me.A.I mustnt B.I cant C.I neednt D.I wont15.I often go fishing when I lived in the countryside.A.should B.would C.could D.might16.Could I use your telephone?Yes,of course you .A.could B.will C.can D.mightBCC

20、BBC17.I cant get through to the general managers office anyhow.The line is busy.Someone the telephone.A.must use B.uses C.must have been using D.must be using 18.Do you think he will do me a favor?As far as I know,he is the last one to help others.He_be prepared to give you a hand,though.A.might B.m

21、ust C.can D.should19.Even though Id hurt my leg,I swim back to the river bank.A.could B.might C.had to D.was able to20.You go to the party if you dont finish your homework first.A.wont B.dont C.oughtnt D.shant21.It is rather cold here.Shall we light a fire?No,we because things are easy to catch fire.A.wont B.cant C.mustnt D.neednt 22.Very loud noise make people ill or drive them mad.A.should B.can C.need D.mustBCDDAD更多资源更多资源