情态动词的用法
情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。?情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语。21世纪教育网版权所有
一、 can, could
1) 表示能力(体力、知识、技能)。
Can you lift this heavy box?(体力)
Mary can speak three languages.(知识)
Can you skate?(技能)
此时可用be able to代替。Can只有一般现在时和一般过去式;而be able to则有更多的时态。21教育网
I'll not be able to come this afternoon.
当表示“经过努力才得以做成功某事”时应用be able to,不能用Can。如:
He was able to go to the party yesterday evening in spite of the heavy rain.
2) 表示请求和允许。
-----Can I go now?
----- Yes, you can. / No, you can't.
此时可与may互换。在疑问句中还可用could, might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。21cnjy.com
---- Could I come to see you tomorrow?
---- Yes, you can. ( No , I'm afraid not. )
3) 表示客观可能性(客观原因形成的能力)。
They've changed the timetable, so we can go by bus instead.www.21-cn-jy.com
This hall can hold 500 people at least.
4) 表示推测(惊讶、怀疑、不相信的态度),用于疑问句、否定句和感叹句中。
Can this be true?
This can't be done by him.
How can this be true?
二、 may, might
1) 表示请求和允许。might比 may语气更委婉,而不是过去式。否定回答时可用can't或mustn't,表示“不可以,禁止”。2·1·c·n·j·y
----Might/ May I smoke in this room?
---- No, you mustn't.
---- May/Might I take this book out of the room?
---- Yes, you can. (No, you can't / mustn't. )
用May I...?征徇对方许可时比较正式和客气,而用Can I...?在口语中更常见。
2)用于祈使句,表示祝愿。
May you succeed!
3) 表示推测、可能性(不用于疑问句)。
might不是过去式,它所表示的可能性比may小。
1.He may /might be very busy now.
2.Your mother may /might not know the truth.
三、 must, have to
1) 表示必须、必要。
You must come in time.
在回答引出的问句时,如果是否定的,不能用mustn't(禁止,不准),而用needn't, don't have to(不必).【来源:21·世纪·教育·网】
---- Must we hand in our exercise books today?
---- Yes, you must.
---- No, you don't have to / you needn't.
2) must是说话人的主观看法, 而have to则强调客观需要。Must只有一般现在时, have to 有更多的时态形式。2-1-c-n-j-y
1. he play isn't interesting, I really must go now.21*cnjy*com
2. I had to work when I was your age.
3) 表示推测、可能性(只用于肯定的陈述句)
1. You're Tom's good friend, so you must know what he likes best.
2. Your mother must be waiting for you now.
四、 dare, need
1) dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。
1. How dare you say I'm unfair?
2. He daren't speak English before such a crowd, dare he?【来源:21cnj*y.co*m】
3. If we dared not go there that day, we couldn't get the beautiful flowers.
2) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。【出处:21教育名师】
1.You needn't come so early.
2. ---- Need I finish the work today?
---- Yes, you must. / No, you needn't.
3) dare和 need作实义动词用时, 有人称、时态和数的变化。在肯定句中,dare后面常接带to的不定式。在疑问句和否定句中,dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。21·cn·jy·com
1. I dare to swim across this river.
2. He doesn't dare (to) answer.
3. He needs to finish his homework today.
五、 shall, should
1) shall 用于第一人称,征求对方的意见。
What shall we do this evening?
2) shall 用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁。
1. You shall fail if you don't work hard.(警告)
2. He shall have the book when I finish it.(允诺)
3. He shall be punished.(威胁)
六、 will, would
1) 表示请求、建议等,would更委婉。
Will / Would you pass me the ball, please?
2) 表示意志、愿望和决心。
1. I will never do that again.
2. They asked him if he would go abroad.
3) would表示过去反复发生的动作或某种倾向。would表示过去习惯时比used to正式,且没有“现已无此习惯”的含义。21·世纪*教育网
1. During the vacation, he would visit me every other day.www-2-1-cnjy-com
2. The wound would not heal.
4) 表示估计和猜想。
It would be about ten o'clock when she left home.
七、 should, ought to
1) should, ought to表示“应该”,ought to表示义务或责任,比should语气重。
1. I should help her because she is in trouble.
2. You ought to take care of the baby.
2) 表示劝告、建议和命令。should, ought to可通用,但在疑问句中常用should。
1. You should / ought to go to class right away.
2. Should I open the window?
3) 表示推测
should , ought to (客观推测), must(主观推测)。
1.He must be home by now. (断定他已到家)
2.He ought to/should be home by now.(不太肯定)
3. This is where the oil must be.(直爽)
4. This is where the oil ought to/should be.(含蓄)
八、 情态动词+不定式完成式(have done)
1) can / could + have done在肯定句中表示“本来可以做而实际上能做某事”,是虚拟语气;在疑问句或否定句中表示对过去行为的怀疑或不肯定, 表示推测。
1. You could have done better, but you didn't try your best. (虚拟语气)
2. He can't have been to that town.(推测)
3. Can he have got the book?(推测)
2) may / might +不定式完成式(have done)
表示对过去行为的推测。不能用于疑问句中,没有虚拟语气的用法。Might所表示的可能性比may小。
1. He may not have finished the work .
2. If we had taken the other road, we might have arrived earlier.
3)must +不定式完成式(have done)
用于肯定句中,表示对过去行为的推测。意为“一定、想必”。其疑问、否定形式用can,can't代替。参看1) can / could + have done表示推测。
1. You must have seen the film Titanic.
2. He must have been to Shanghai.
4)should +不定式完成式(have done)
用于肯定句中,表示对过去行为的推测。
He should have finished the work by now。
表示“本应该做而实际上没有做某事”,其否定式表示某种行为本不该发生却发生了。可以与ought to +不定式完成式(have done)互换。
1. You ought to / should have helped him. (but you didn't.)
2. She shouldn't have taken away my measuring tape, for I wanted to use it.
5) needn't +不定式完成式(have done)
表示“本来不必做而实际上做了某事”。
You needn't have watered the flowers, for it is going to rain.
6) will +不定式完成式(have done)
主要用于第二、三人称,表示对已完成的动作或事态的推测。
He will have arrived by now.
情态动词专项练习
( ) 1. Henry _______ be at home because he phoned me from the farm just now.
A. mustn’t B. isn’t able to C. may not D. can’t
( ) 2. Peter could hardly see the words on the blackboard, _______?
A. did he B. couldn’t he C. didn’t he D. could he
( ) 3. We’ll go for a picnic if it _______ this Friday.
A. won’t rain B. isn’t raining C. doesn’t rain D. don’t
( ) 4. There will be a volleyball match in our school, _______?
A. be there B. is there C. will there D. won’t there
( ) 5. Buses and cars _______ stop when the traffic lights are red.
A. can B. must C. may D. need
( ) 6. ---- How do you like Hangzhou, Miss Read? ---- Sorry, I _______ there.
A. have gone B. have been C. haven’t gone D. haven’t been
( ) 7. ---- Listen! Somebody is singing in the next room. Who _______ it he? Is it Wei Fang? ---- No. It _______ be her. She is at school now.
A. will, may not B. must, mustn’t C. may, can’t D. may, won’t
( ) 8. ---- Excuse me. Will you please tell me the way to the railway station?
---- Oh, sorry, but I don’t know. You _______ go and ask that policeman.
A. may B. must C. would D. should ( ) 9. ---- What’s wrong with my bike? ---- It’s broken, but it _______ in an hour.
A. can be mended B. must mend C. can mend D. must be mended
( ) 10. ----- Children all bike this book. ---- I think it _______ very interesting.
A. need be B. must be C. may be D. can be
( ) 11. ---- May I go to the cinema, dad?
---- No, you ___. You must finish your homework first.
A. mustn’t B. won’t C. must D. may
( ) 12. To make our hometown more beautiful, you _______ throw rubbish into the river. A. needn’t B. mustn’t C. must D. may
( ) 13. She _______ know the answer, but I’m not sure.
A. maybe B. may be C. may D. must
( ) 14. The city cleaners ___ repeat their work many times a day during the dust – storm season.
A. may B. can C. might D. have to
( ) 15. ---- Must I go with them tomorrow? ---- No, you _______.
A. mustn’t B. shouldn’t C. needn’t D. can’t
( ) 16. _______ I have your name, please? ----- Yes, Michael. M-I-C-H-A-E-L.
A. Must B. Will C. May D. Would
( ) 17. _______ you pass me a pen? I’d like to write down the telephone number.
A. Need B. Could C. Must D. Should
( ) 18. _______ you be happy!
A. May B. Can C. Must D. Would
( ) 19. Since the road is wet this morning, _______ last night.
A. it must rain B. is must have rained C. it must be rained D. it must have been rained ( ) 20. I _______ such a mistake again.
A. shall never make B. can never do C. will never make D. need never do
( ) 21. I _______ it again.
A. would like you to read B. would like that you read
C. would like you reading D. would like you read
( ) 22. You had better _______ late next time.
A. not be B. not to be C. being not D. to be not
( ) 23. _______ open the door for you?
A. Would you like that I B. Do you want me C. Will I D. Shall I
( ) 24. As the English is difficult enough, I _______ study it.
A. cannot B. am not able to C. can’t D. am not able
( ) 25. He _______ to meet us at the station, but didn’t see us.
A. did go B. did went C. goes D. had
( ) 26. I’ve lost my watch. _______ you seen it anywhere?
A. Have B. had C. has D. having
( ) 27. _______ you read today’s newspaper? Not yet.
A. Did B. Have C. Are D. Has
( ) 28. What _______ it mean?
A. does B. is C. has D. was
( ) 29. Work _______ come first.
A. can B. may C. should D. must
( ) 30. The animals in cages _______ be happy.
A. aren’t B. can’t C. don’t D. doesn’t
( ) 31. He _______ come here tomorrow.
A. don’t need B. doesn’t need to C. needn’t to D. needs not ( ) 32. What time _______ the Reads usually have supper?
A. are B. does C. have D. do
( ) 33. _______ you in Grade One last year? Yes, I _______.
A. Are, am B. Were, was C. Are, was D. Was, was ( ) 34. Li Ping _______ ill in bed, so he _______ go to school today.
A. was, wasn’t B. was, don’t C. did, didn’t D. was, didn’t
( ) 35. Where _______ the twins last night?
A. were B. was C. are D. did ( )
36. _______ you enjoy living on the farm?
A. Do B. Are C. Can D. Have
( ) 37. He _______ come here tomorrow.
A. needn’t B. needn’t to C. doesn’t need D. needs not
( ) 38. The temperature _______ below zero after twelve at night.
A. will be B. won’t C. is going to D. does
( ) 39. I think it _______ fine tomorrow.
A. is B. was C. will be D. be
( ) 40. I’d _______ to dance with my classmates on Sunday afternoon.
A. loves B. want C. hope D. like
( ) 41. _______ you have breakfast yesterday morning?
A. Do B. Did C. Are D. Were
( ) 42. Li Lei and Wu Dong _______ on the maths problem when I left.
A. are working B. work C. was working D. were working ( ) 43. In our school, classrooms _______ cleaned every Saturday.
A. will do B. shall do C. must be D. can be
( ) 44. Many trees _______ every year.
A. was planted B. must planted C. must be planted D. must be plant ( ) 45. Can the museum _______ next year?
A. built B. be built C.. build D. will be built
( ) 46. The teachers _______.
A. must be listened to carefully B. must listen to carefully C. must strict with their students D. should listen to by the students
( ) 47. I don’t know when she ___ to Beijing. When she __ there, her daughter will go with her.
A. will go, will go B. will go, goes C. goes, will go D. goes, goes
( ) 48. The twins _______ a little Chinese from then on.
A. were speaking B. was able to speak C. could speak D. have been able to speak ( ) 49. ---- Please don’t use my computer. ---- Sorry! I _______ do it again.
A. can’t B. must not C. won’t D. should
( ) 50. How often _______ you _______ to the park when you were in Beijing?
A. do, go B. did, go C. will, go D. have, go
( ) 51. ---- _______ I hand in the work now? ---- No, you needn’t.
A. Must B. May C. Shall D. Need
( ) 52. ---- Can I go to see a film tonight, Dad? --- _______.
A. Yes, you must B. Yes, you need C. No, you can’t D. No, you won’t
( ) 53. He _______ be in his office, fo I saw him in the street just now.
A. can’t B. shouldn’t C. mustn’t D. needn’t
( ) 54. ---- Must we clean the classroom right now?
---- No, you __. You __ clean it after lunch.
A. needn’t, must B. mustn’t, can C. needn’t, may D. mustn’t, must ( ) 55. ---- May I take these magazines out of the reading room? ---- No, you _______. A. won’t B. don’t C. needn’t D. mustn’t
( ) 56. Mary can hardly believe her eyes, _______?
A. can’t she B. can she C. doesn’t she D. does she
( ) 57. Excuse me, _______ you show me the way to the station?
A. must B. shall C. may D. could
( ) 58. You _______ return the book now; you can keep it till next week.
A. can’t B. mustn’t C. don’t D. needn’t
( ) 59. I can’t do it, so I _______ your help.
A. need B. will need C. needn’t D. don’t need
( ) 60. ---- _____ you lend me you pen? ---- Sorry, I’m using it. You _______ borrow Mary’s. A. May, must B. Can, may C. Can, need D. Would, will
( ) 61. Sir, you _______ sit here, it’s for women or children only.
A. don’t B. can’t C. won’t D. needn’t
( ) 62. ---- Can you write a letter in English? ---- No, I _______.
A. can’t B. may not C. shouldn’t D. mustn’t
( ) 63. My boy, you _______ talk to your father like that.
A. won’t B. may not C. shouldn’t D. has to
( ) 64. ---- Hello, may I speak to Mr. Smith, please? ---- _______.
A. can B. must C. can D. should
( ) 65. She said that he _______ smoke there.
A. Yes, you may B. Sorry, you can’t C. Yes, I am D. Hold on, please ( ) 66. Don’t play with the knife. You _______ hurt yourself.
A. might B. mustn’t C. would D. should
( ) 67. Don’t play with the knife. You _______ hurt yourself.
A. may B. should C. have to D. need
( ) 68. He said that he_______ speak a little English.
A. might B. could C. would D. should
( ) 69. You _______ be late next time.
A. mustn’t B. can C. needn’t D. need
( ) 70. When the traffic lights are red, you _______ go.
A. can’t B. needn’t C. may not D. mustn’t (? ?)?69.?You?_______?be?late?next?time.?
A.?mustn’t???????????B.?can????????????C.?needn’t????????????D.?need?
( ??)?70.?When?the?traffic?lights?are?red,?you?_______?go.?
A.?can’t?????????????B.?needn’t?????????C.?may?not????????????D.?mustn’t?
( )?71.?----?You?must?be?here?at?half?past?five?tomorrow?morning.??
----?Sorry?I?____?be?here?so?early.?
A.?needn’t???????????B.?mustn’t??????????C.?can’t??????????????D.?may?not?
(? ?)?72.?----?May?I?smoke?here??----?No,?you?_______.?
A.?mustn’t???????????B.?don’t????????????C.?won’t?????????????D.?need?
( )?73.?----?_______?I?take?the?book?out??----?Yes,?but?you?_____?return?it?before?next?Thursday.?
A.?Can,?may?????????B.?May,?must????????C.?May,?need?????????D.?Need,?must?
( ??)?74.?_______?you?lend?me?your?dictionary??
A.?Could????????????B.?Need????????????C.?Should????????????D.?Must?
( ??)?75.?You______?go?to?see?a?doctor?at?once?if?you?have?hurt?yourself?badly.?
A.?can??????????????B.?need?????????????C.?must?????????????D.?may?
( ??)?76.?The?traffic?_______?stop?when?the?lights?are?red.?
A.?must?????????????B.?need?????????????C.?may?????????????D.?can?
(? ?)?77.?----?Is?the?boy?by?the?window?your?brother??----?It?_______?him.?
A.?need?to???????????B.?would?be??????????C.?maybe???????????D.?may?be?
(?? )?78.?----?Can?your?brother?swim??----?_______.?
A.?Yes,?he?is??????????B.?No,?he?isn’t????????C.?Yes,?he?can??????D.?No,?he?can?
(? ?)?79.?This?is?a?good?film.?You?_______?it.?
A.?can’t?see???????????B.?don’t?have?to?see????C.?can’t?miss??????D.?must?watch?
(? ?)?80.?-----?Must?I?stay?in?till?this?evening??----?No,?you?_______.?
A.?can’t??????????????B.?mustn’t????????????C.?needn’t????????D.?won’t?
(? ?)?81.?----?Do?you?have?to?write?to?your?pen-friend??----?Sorry,?but?I?really?_______.?
A.?can’t??????????????B.?must??????????????C.?have???????????D.?should?
( ??)?82.?----?Could?I?borrow?your?pen??----?Yes,?you?_______.?
A.?could??????????????B.?can???????????????C.?were?able???????D.?may?
(? ?)?83.?----?_______?I?watch?TV?now,?Mum??----?No,?you?_______?finish?your?homework?first.?
A.?must,?needn’t????????B.?Can,?may??????????C.?May,?must??????D.?May,?mustn’t?
(? ?)?84. I’m sorry. I ___ go now. My father told me on the phone that my mother was ill. A. can B. may C. have to D. think(? ?)?85.“Where’s my umbrella?” “It’s fine today. You ___ take an umbrella with you.” A. can’t B. needn’t C. mustn’t D. shouldn’t(? ?)?86.---I don’t mind telling you what I know.
---You __. I’m not asking you for it.
A. needn’t B . mustn’t C. may not D .can’t(? ?)?87.We hope that as many people as possible ___ join us for the charity show tomorrow.
A. need B. can C. must D. should(? ?)?88.---___ your friend play the guitar?---Yes, he can, but he can’t play it well.
A. Must B. Can C. Should D. Need(? ?)?89.---Is Mr. Brown driving here?---I’m not sure. He ____ come by train.
A. may B. shall C. need D. must(? ?)?90.---May I put my bike here?---No, you ___.You should put it over there.
A. couldn’t B. needn’t C. mustn’t D. won’t(? ?)?91.The baby is too young. You ___ give her big pieces of food.
A. may B. must C. may not D. must not(? ?)?92.Tony ___ go to the opera on Saturday because he’s going to have a meeting. A. can’t B. might C. mustn’t D. should(? ?)?93.---Tom, don’t drive too fast, you ___ hit the others’ cars.---Ok,I won’t,Mum. A. must B. need C. may D. have to(? ?)?94.---Must I do the work now?---No,you ____.You may do it later. A. can’t B . mustn’t C. needn’t D. shouldn’t?(? ?)?95.I’m sure this book ___ Li Lei’s, because there is his name on it. A. can’t be B. may be C. might be D. must be(? ?)?96.---Listen! Is Professor Bloom giving a speech in class?---No, it ___ be him. He has gone to France. A. may not B. mustn’t C. needn’t D. can’t(? ?)?97.---Who’s that boy reading in the garden ? Is that David?---It ___ be David. I saw him in the classroom just now.
A. must B. can’t C. may D. shouldn’t(? ?)?98.---Will you answer the telephone?It ___ be your mother.---Sorry.I ____.I’m busy. A. can; mustn’t B. may; won’t C .may; can’t D. need; will(? ?)?99.Four hundred dollars for a pair of shoes, you ___ be joking!
A. may B. can C. need D. must(? ?)?100. The weather turned out to be fine yesterday. I _____ the trouble to carry my umbrella with me.
A. should have taken B. could have taken C. needn't have taken D. mustn't have taken(? ?)?101 .I didn't hear the phone. I ________ asleep.A. must be B .must have been C. should be D. should have been didn't(? ?)?102.---I stayed at a hotel while in New York.
---Oh, did you? You ________ with Barbara.
A .could have stayed B. could stay C. would stay D. must have stayed(? ?)?103.My sister met him at the Grant Theatre yesterday afternoon, so he ________ your lecture.
couldn't have attended B. needn't have attended
C. mustn't have attended D. shouldn't have attended
(? ?)?104.---I wonder why they are late.---They ________ the train.A. could miss B. might miss C. must have missed D. can't have missed(? ?)?105.He ________ the examination _________ he wasn't careful enough.A. would pass; because B. could have passed; ifC. should have passed; but D. had passed; so(? ?)?106.Without his help, we ________ such rapid progress.A. didn't make B. don't make C. would not make D. would not have made(? ?)?107.There was a lot of fun at yesterday's party. You ______ come, but why didn't you?A. must have B. ought to have C. should D. need have(? ?)?108.We ________ the manager, but no one ________ his telephone number.A. could have called; knew B. could call; had knownC. could have called; had known D. could call; knew
参考答案:?
1.?D?2.?D?3.?C?4.?D?5.?B?6.?D?7.?C?8.?A?9.?A?10.?B?11.?A?12.?B?13.?C?14.?D?15.?C?16.?C?17.?B?18.?A?19.?B?20.?A?21.?A?22.?A?23.?D?24.?B?25.?A?26.?A?27.?B?28.?A?29.?D?30.?B?31.?B?32.?D?33.?B?34.?D?35.?A?36.?A?37.?A?38.?A?39.?C?40.?D?41.?B?42.?D?43.?C?44.?C?45.?B?46.?A?47.?B?48.?D?49.?C?50.?B?51.?A?52.?C?53.?A?54.?C?55.?D?56.?B?57.?D?58.?D?59.?A?60.?B?61.?B?62.?A?63.?C?64.?B?65.?D?66.?B?67.?A?68.?B?69.?A?70.?D?71.?C?72.?A?73.?B?74.?A?75.?C?76.?A?77.?D?78.?C?79.?C?80.?C?81.?B?82.?B?83.?C 84.C 85.B 86.A 87.B 88.B 89.A 90.C 91.D 92.A 93.C 94.C 95.A 96.D 97.B 98.B 99.D 100. C 101.B 102.A 103.A 104.C 105.C 106.D 107.B 108.A