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1、情态动词用法小结（复习）,一、各个情态动词用法归纳,can和 could,1 . 表示“能力” I can swim , but my sister cant.,2表示“许可”、“请求” Can I go with you ? (请求) Father said I could go to cinema. (表示过去的许可) You cannot smoke in the room. (cannot 表示“禁止”) Could I use your phone?Yes, of course you can. 肯定回答，不能用could ，一般是Yes, please. Thanks.,3表示“理
2、论上或逻辑上的可能” Anybody can make mistakes. (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),4“猜测”（主要用于否定句和疑问句）： He cant be at home. (否定句) Can the news be true ? (疑问句),与be able to 的区别： can 只有现在和过去时态，强调能力； be able to有各种时态，表示一时的能力，强调结果。 Mary can play the piano .She has been able to play it si
3、nce she was 5. Yesterday I was able to get home before the heavy rain.,1表示“许可” You may take a walk. Students may not make noise in the library. (may not 表示不许可或禁止) May I come in? 否定回答No, you mustnt. /cannot. 也可以 may not 肯定回答sure, certainly, of course Might I trouble you for a light? You may indeed.,2
4、.表示事实上的可能性 It may rain tomorrow.(表示可能会发生) Electric irons could be dangerous,they might give you a severe shock.,may 和might,3.“预测” Sam might have taken the money, but it seems unlikely.,must,1.表示“必须”、“务必”： We must obey orders. Must I pay now ? 肯定回答 Yes, you must 否定回答 No, you neednt 或 No, you dont hav
5、e to,2.表示“预测” (必定，必会) 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 Our boy must do the opposite to what we ordered. Just when I was busy , she must come and chat,shall,1.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
6、命令、允诺、警告、决心等 Each member shall wear a name card. No one shall stop me. You shall have the book when I finish reading it.（允诺） He shall get his allowance.,Should,1.表示“必须”： I should answer his letter as soon as possible. You shouldnt judge a man always by the clothes. (shouldnt劝告),2.猜测，“估计 应该” That sho
7、uld be Janet coming upstairs now.,Will和 Would,1.表示“意愿” I will call you as soon as possible. He would not let me try .,3.表示“预测”或“习惯性”： That would be his mother.(would be 表示肯定是) He will sit there hour after hour looking at the river. He would come to see me when he was in London,2.表示“请求” Will you kind
8、ly tell me the way to the post office ? Would you give me your address ? (用 would 比 will 表示更客气),used to 与would的区别 used to表示过去情况与现在不同; would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,1.表示“应该” You ought to go to see t
9、he doctor. (ought to 语气比must 弱) You oughtnt (ought not) to smoke so much. Ought you to smoke so much?,2.表示“预测”，婉转,比must语气弱 They ought to be there by now.,should 和ought to的区别,含义大致相同， ought to 强调在客观上（法律，章程和道义），比should 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。,ought to,You ought to go and see Mary tomorrow.
10、You shouldnt judge a man always by the clothes.,need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, 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 to give our own opinion. We need to tell them the news.,注意：dare用作实义动词时，其否定句中的t
11、o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 modal verb+ have done: 对过去发生的事情进行评价、猜测，表示“应当已经、想必已经、本来可以做但未做” I should 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 m
12、ore careful. You ought to have come,but why didnt you?,should / ought to have done 本该干什么（却没干）,could have done 本可以干什么（却没有）,must have done 一定已经,cannt have done 一定已经没有,may / might have done 可能已经,need have done 本来需要,modal verb+be doing: 对正在发生的事情进行评价、猜测，表示“想必正在、可能正在、应当正在” Its 12 oclock .They must be havi
13、ng lunch. They may be discussing the problem. He cant be telling the truth. She shouldnt be working like that.She is still so weak.,She must have been to Beijing, _? She must have been to Beijing last year, _?,hasnt she,didnt she,情态动词专项练习 I hear youve got a set of Australian coins. I have a look? Ye
14、s, certainly. A. Do B. May C.Shall D. Should 2. He seldom listens to others. He answer for what he has done. A. shall B. will C. can D. would 3. May I leave the office before 5 oclock in the afternoon? No, Im afraid you . A. neednt B. shouldnt C. mustnt D. wont 4. Shall I tell John about it? No, you
15、 . I dont know his telephone number. A. neednt B. wouldnt C. mustnt D. shouldnt 5. Mr Bush is on time for everything. How it be that he was late for the opening ceremony? A. can B. should C. may D. must,A,C,B,A,A,6. The traffic light is red, so I stop my car. A. must B. have to C. can D. mustnt 7. W
16、hat 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 grown 8. I was really anxious about you. You home without a word. A. mustnt leave B. shouldnt have left C. couldnt have left D. neednt leave 9. Tom show his exam results to his parents. A. dare not B. dared C. dare t
