语法知识—情态动词的经典测试题含答案
高考情态动词单选20题答案解析版
高考情态动词单选20题答案解析版1. She ______ know the answer. She always gets good grades in English.A.mustB.canC.mayD.could答案：A。
选项A“must”表示肯定的推测，意为“一定”，根据后句她英语总是得高分，可以推断她一定知道答案。
选项B“can”表示能力，“能、会”；选项C“may”表示可能性较小的推测，“可能”；选项D“could”表示过去的能力或委婉的请求等。
2. You ______ finish your homework before you watch TV.A.mustB.canC.mayD.could答案：A。
“must”在这里表示“必须”，在看电视之前必须完成作业。
选项B“can”表示能力或允许；选项C“may”表示可能或允许；选项D“could”表示过去的能力或委婉的请求等。
3. He ______ be at home. I just saw him go out.A.mustn'tB.can'tC.may notD.couldn't答案：B。
“can't”表示否定的推测，“不可能”，因为刚刚看到他出去了，所以他不可能在家。
选项A“mustn't”表示禁止；选项C“may not”表示可能性较小的否定推测；选项D“couldn't”表示过去的否定推测，语气比“can't”弱。
4. —______ I use your pen?—Sure. Here you are.A.MustB.CanC.MayD.Could答案：B。
这里表示请求，“我能使用你的钢笔吗？”“can”可以用于请求允许。
选项A“must”表示必须；选项C“may”也可以用于请求允许，但语气比“can”弱；选项D“could”用于委婉的请求。
5. She ______ have forgotten to bring her book. She is always very careful.A.mustn'tB.can'tC.may notD.couldn't答案：B。
高中英语情态动词形式单选题60题(含答案)
高中英语情态动词形式单选题60题(含答案)1.She ____ be very tired after such a long journey.A.mustB.canC.couldD.might答案：A。
“must”在这里表示肯定的推测，“她在这么长的旅途之后一定很累”。
“can”表示能力、可能性，在此处不太符合语境；“could”表示过去的能力、可能性或委婉语气，也不太符合；“might”表示可能性较小的推测。
2.He ____ speak French fluently when he was young.A.mustB.canC.couldD.should答案：C。
“could”表示过去的能力，“他年轻时能流利地说法语”。
“must”表示肯定的推测，不符合；“can”表示现在的能力；“should”表示应该。
3.You ____ finish your homework before you watch TV.A.mustB.canC.could答案：A。
“must”表示必须，“你必须在看电视之前完成作业”。
“can”表示能力、可能性；“could”表示过去的能力、可能性或委婉语气；“may”表示可能。
4.____ I borrow your pen?A.MustB.CanC.CouldD.Will答案：B。
“Can I...?”表示请求，“我能借你的笔吗？”“Must”表示必须，语气太强；“Could”用于更委婉的请求，但不如“Can”常用；“Will”表示将来。
5.She ____ have forgotten her keys. She's always so careful.A.can'tB.mustn'tC.shouldn'tD.needn't答案：A。
“can't”表示否定的推测，“她不可能忘了钥匙，她总是很细心”。
“mustn't”表示禁止；“shouldn't”表示不应该；“needn't”表示不必。
情态动词练习题带答案
情态动词练习题带答案情态动词练习题带答案一、单项选择情态动词1．I still find it hard to imagine that such a clever child __________ make such a foolish mistake. A．shall B．must C．can D．should【答案】D【解析】【详解】考查情态动词。
句意：我仍然难以想象这样聪明的孩子竟然犯这样愚蠢的错误。
should 作为情态动词，可以用来表示意外、惊喜或者在说话人看来是不可思议的，常常译为"竟会"、"居然"，这么聪明的孩子竟然犯这样愚蠢的错误。
表示意外，shall表示允诺，命令等，must 表示必须，can表示能力及可能性。
所以答案选D。
2．Keep up your spirits even if you _____ fail hundreds of times.A．must B．needC．may D．should【答案】C【解析】【详解】考查情态动词。
A. must必须；B. need需要；C. may可能，或许；D. should应该。
句意：即使失败了几百次，也要振作起来。
此处表示一种不确定的推测，故选C。
3．Most of the top leaders expressed a common desire at the UN conference, ______ that different cultures ______ coexist with tolerance.A．the one ; must B．the one ; should C．one ; must D．one ; should【答案】D【解析】【详解】考查替代和情态动词。
句意：大多数高层领导人在联合国大会上表达了一个共同的愿望，即不同的文化应该与宽容共存。
大多数高层领导人在联合国大会上表达了一个共同的愿望，即不同的文化应该与宽容共存。
情态动词测试题及答案
情态动词测试题及答案一、选择题1. You _______ be careful when you cross the street.A. canB. mustC. shouldD. may答案：B2. She _______ be at home now because she called me a moment ago.A. canB. mustC. mightD. could答案：B3. I _______ finish my homework before I go out to play.A. canB. mustC. wouldD. should答案：B4. You _______ wait for me at the bus stop; I'll be there infive minutes.A. needB. mustC. canD. may答案：C5. They _______ have finished their work by now.A. canB. mustC. shouldD. might答案：C二、填空题6. It’s cold outside. You _______ wear a coat.答案：should7. The doorbell rang, _______ it be the postman?答案：could8. _______ you tell me the way to the library?答案：Could9. I _______ go to the party, but I have to finish my report first.A. canB. mustC. wouldD. should答案：C10. _______ I borrow your pen for a moment?答案：May三、改错题11. He can go to the concert, but he must to stay at home.错误：to stay正确：must stay12. She might have finished her work, but I think she should be working now.错误：might have finished正确：may have finished13. You should to call your parents before you leave.错误：to call正确：should call14. I would like to go to the beach, but I can’t afford it.错误：would like正确：could15. They must have been at the meeting, but they were actually at the cinema.错误：must have been正确：could have been四、翻译题16. 他可能已经完成了他的作业。
（完整版）情态动词专项练习（含答案）
（完整版）情态动词专项练习（含答案）1. I promised to get there before 5 o’clock, but now the rain is pouring down. They ______ for me impatiently.A. may waitB. ought to waitC. could waitD. must be waiting2. He was very brave. Even though she’d hurt her leg, she ________ go back alone.A. couldB. mightC. have toD. was able to3. You ________ pay too much attention to your reading skill, as it is so important.A. cannotB. shouldC. mustD. needn’t4. I’ve tried several times, but the car just _______.A. doesn’t startB. wouldn’t startC. won’t startD. didn’t start5. Always the old lady ______ sit for hours doing nothing at all.A. was used toB. wouldC. used toD. should6. There used to be a small school,___________?A. was thereB. wasn’t itC. usedn’t thereD. usedn’t it7. Our house is on the top of the hill, so in summer the wind _____ be pretty cold.A. mustB. canC. ought toD. need8. Haven’t I told you that you __________ have the ans wer tomorrow morning?A. willB. shallC. shouldD. would9. I’m surprised that he _______ in the match.A. should failB. should have failedC. would have failedD. may have failed10. Better go to see my sick colleague right now, ________I?A. hadn’tB. didn’tC. don’tD. won’t11. Sir, you ______ be hunting deer here, for they are preserved by the government.A. oughtn’t toB. can’tC. won’tD. needn’t12. Sorry I’m late. I ______ have turned off the alarm clock and gone back to sleep again.A. mightB. shouldC. canD. will13. —There were already five people in the car, but they managed to take me as well.— It __________ a comfortable journey.A. can’tB. shouldn’t beC. must have beenD. couldn’t have been14. To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.A. canB. wouldC. mightD. should15. ____ three people who travel together, there _____ be at least one who ____ be my teacher.A. Between; can; willB. In; should; couldC. Among; will; mayD. Of; must; can16. —Could you lend me that book you ______ me aboutwhen I telephoned you?—No, I am sorry, I can’t. I gave it to a friend.A. were tellingB. would tellC. had toldD. had been telling17. —We need a person badly to think up such an idea.—_______ the new comer have a try?A. ShallB. MayC. ShouldD. Need18. We ________ so tired. We’ve only been to a party.A. mustn’t have feltB. wouldn’t have feltC. shouldn’t have feltD. couldn’t have felt19. Professor Smith, many students want to see you. __________ they wait here or outside?A. DoB. ShallC. WillD. Would20. —How about paying a visit to Mr. Richardson, our former history teacher?—Good idea. I will e-mail him today so he _____know _________ to expect us.A. shall; whyB. may; whenC. would; whyD. will; how21. —I went to work on foot yesterday, though it _________ cats and dogs.—You __________ by bus. It was likely to get a cold.A. is raining; must have goneB. rained; would goC. was mining; should have goneD. have rained; could have gone22. You ______ pay too much attention to your reading skill, as it is so important.A. cannotB. shouldC. mustD. needn’t23. I told Sally to fix him up with this job, but perhaps I _________ it out for her.A. had to writeB. must have writtenC. should have writtenD. ought to write24. My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture.A. couldn’t have attendedB. needn’t have attendedC. mustn’t have attendedD. shouldn’t have attended25. Research findings show we spend about two hours dreaming every night, no matter what we ________ during the day.A. should have doneB. would have doneC. may have doneD. must have done26. —Is there any flight to Tokyo today?— I think there _____, for the weather is too bad.A. mustn’t beB. mightn’t beC. needn’t beD. can’t be27. —I’m told that John had another car accident this morning.— I believe not. He _____ so careless.A. shouldn’t have beenB. wouldn’t have beenC. couldn’t have beenD. mustn’t have be en28. It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.A. might have spentB. ought to have spentC. must have spentD. could have spent29. —I didn’t know you were good friends.—You _______. I have known her since she moved here. You were studying abroad then.A. may haveB. needn’t haveC. couldn’t haveD. must have30. They must have finished the work by the end of last month, __________?A. mustn’t theyB. haven’t theyC. hadn’t theyD. didn’t they31. —I didn’t see her yesterday.— Of course, you _____, because he had gone for a trip.A. can’tB. may not haveC. can’t haveD. mustn’t have32. You ________ phone him if you want to, but you _________. He is sure to phone you.A. may; mustn’tB. have t o; needn’tC. can; doesn’t needD. can; needn’t33. — She must have gone back to the valley.— ______, she _____ have. The entrance to it was nowhere to be found.A. No; mustn’tB. Yes; mightC. Yes; couldD. No; couldn’t34. He _____ full marks, but he was so careless as to make a spelling mistake.A. must have gainedB. can have gainedC. could have gainedD. must gain35. From what you said, she _____ you about it.A. mustn’t have toldB. can’t have toldC. mustn’t tellD. can’t tell36. — You ought to have made an apology to Tom yesterday evening.— Yes, I know I _________.A. ought toB. have toC. should haveD. must have37. —Is there a fog in the evening?—There _______ be. I’ll make a phone call to find it out.A. mustB. wouldC. willD. might38. — _______ he help you with the problem?—Well, though it is very hard, __________ I’ll do what I can to work it out.A. Shall; butB. Can; andC. Must; howeverD. Will; still39. —How is that, Joan?—Yeah, it’s from the boss. She _________ first, whether she likes it.A. shall goB. ought to have goneC. should goD. must have gone40. —Would you like to watch the video, in which you can see foreigners making jiaoji during the Spring Festival?—Sure, it ______ be very interesting.A. shouldB. mayC. canD. will41. —The door was open.—It _________ open. I had locked it myself and the key was in my pocket.A. can not beB. must not beC. can not have beenD. must not have been42. —Where ________ Margaret have put the empty bottles?—She ________ them away. They must be somewhere.A. can; can’t have thrownB. must; needn’tC. must; must have thrownD. cant; must throw43. —Mum, I climbed to get the Teddy Bear from the top of the shelf.—My goodness! You _______ yourself. You ______ do that next time.A. mu st have hurt; mustn’tB. should have hurt; can’tC. may have hurt; mustn’tD. might have hurt; won’t be able to44. —Shall I go and buy more food and drinks for the party?—No, we have prepared a fridge of those. That _______ be quite enough.A. canB. mayC. mightD. ought to45. —Hurry up, Michael! It’s ten to three.—Goodness me! The class_______. I’ll be late again.A. must beginB. may beginC. should have begunD. must have begun46. When he was there, he ____ go to that coffee shop at the street comer after work every day.A. wouldB. shouldC. had betterD. might47. —I hear you have written a novel.—Yes, the book ________ be out in a month or so.A. canB. dareC. shouldD. need48. —How could I thank you enough?—Don’t mention it. Any other man _________ that.A. must doB. could doC. would have doneD. should have done49. —Why aren’t they here yet?—They ________ the bus.A. can have missedB. must be late forC. may have missedD. might be late for50. Mike _______ come to see me I don’t want to go out in case he comes.A. canB. mustC. mayD. will51. The thief ________ in from the kitchen window as the door was closed.A. may climbB. must have climbedC. could have climbedD. should have climbed52. —You didn’t invite Bill?— __________ him too?A. Must I inviteB. Must I have invitedC. Should I inviteD. Should I have invited53. —Why didn’t you attend the lecture yesterday?—I didn’t think that we _______ on Sundays.A. shouldB. ought to haveC. shouldn’t haveD. will have to54. It’s said that there are plenty of hotels in that town. There ______ be any difficulty for you to find somewhere to stay.A. wouldn’tB. mustn’tC. shouldn’tD. needn’t55. —Would you be here to attend the English party this evening?—Yes, we _________.A. shallB. wouldC. willD. must56. On Sundays when I was a child, Father and I _______ get up early and go fishing.A. couldB. wouldC. mightD. should57. —You’d better keep quiet in class.—Sometimes I ________ Yesterday, I was very quiet during my English class.A. wouldB. doC. didD. have58. I lived with my sister this summer and didn’t have to pay rent. So I ______ save most of my salary.A. couldB. wouldC. was able toD. should59. —Look, John’s fallen asleep.— Oh, he _______ too late last night.A. might sit upB. should have sat upC. could sit upD. must have sat up60. —I posted the letter a week ago.—Then they __________ the letter by now. It usually takes four days.A. can have receivedB. must receiveC. should receiveD. ought to have received61. He used to teach in that university and I _________ ride past it on my way to work.A. wouldB. couldC. shouldD. might62. —So you have to leave now.—Yes, I __________.—How nice it would be if you could stay a bit longer!A. have toB. ought toC. doD. have63. He _______ Shanghai, for I saw him talking with the headmaster a moment ago.A. must have gone toB. can’t have gone toC. mustn’t have been toD. can’t have been to64. From what I learn about their hotel, the service and the weather, they _____ their holiday very much.A. wouldn’t have enjoyedB. shouldn’t have enjoyedC. needn’t have enjoyedD. can’t have enjoyed65. It is not like Jack to be unfriendly, so he _________ you when you called.A. can’t have seenB. should not have seenC. must not have seenD. need not have seen66. —Many people in England love to give advice on weather reporting.—Yes, but I think the weather office’s computers _________ be more accurate.A. canB. mustC. ought toD. might67. —The farmers lived near the high way.—________ very noisy.A. It must have beenB. They must beC. That might beD. There must be68. She is too slow. She ________ pass the test, but she __________ too little.A. would; knewB. will; knowsC. would; knowsD. will; knew69. —Mary didn’t turn up last time, did she?—No. She_________. We had changed our plan.A. shouldn’t have comeB. needn’t have to comeC. didn’t need to comeD. needn’t have come70. —They haven’t finished the work up to now.—Well, they________.A. shouldB. should haveC. wouldD. must have71. —Shall I go and buy more fruit for the party?—No, I have already bought 3 baskets. That _________ be enough.A. canB. ought toC. mayD. might72. —Why hasn’t the speaker turned up?—He _________ the flight. I’ll find it out at once.A. must have missedB. might have missedC. would have missedD. could have missed73. I _______ pay Tom a visit, but I am not sure whether I will have time this Sunday.A. shouldB. mightC. wouldD. could74. —Who is the girl standing over there?— Well, if you _____ know, her name is Mabel.A. mayB. canC. mustD. shall75. It has been announced that candidates (考生)________ remain in their seats until all the papers have been collected.A. canB. willC. mayD. shall【答案解析】1．D。
情态动词练习题带答案
情态动词练习题带答案一、单项选择情态动词1．—CanIpaythebillbycheck—Sorry，ir．Butitithemanagementruleofourhotelthatpayment_____bemadeincah．A．hallB．needC．willD．can【答案】A【解析】【详解】考察情态动词用法。
句意：——我能用支票付账吗——对不起,先生。
但这是我们酒店的管理规定,支付要用现金。
hall可以表示命令，警告，强制，或者指规则和法律要求做的事情。
本题正是考察了hall表示按照规则和法律要求做的事情。
故A正确。
2．Mr.Baker,ometudentwanttoeeyou.______theywaithereoroutideA．MayB．ShouldC．ShallD．Will【答案】C【解析】【详解】考查Shall的用法。
句意：贝克先生，有些学生想见你。
他们是在这里等还是在外面等Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。
故选C。
【点睛】Shall的用法Shall作为助动词，一般用于第一人称Ⅰ和We，表示一个将来的动作，构成将来时态。
Shall后面接动词原形。
例如：（1）IhallthinkitoverandLetyouknowmyidea.我将考虑一下此事，然后告诉你我的想法。
1.Shall用于第一人称，表示征求对方的意愿。
如：Whathallwedothievening2.Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。
如：ShallwebeginourleonWhenhallhebeabletoleavethehopital3.Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。
如：Youhallfailifyoudon'tworkharder.（警告）HehallhavethebookwhenIfinihreading.（允诺）Hehallbepunihed.（威胁）3．---Hi,Johnon,anyideawhereSuaniA．canbeB．muthavebeenC．mighthavebeenD．houldbe【答案】D【解析】考查情态动词的用法。
(必考题)中考英语常用语法知识——情态动词经典题(答案解析)
一、选择题1．—Don't forget to come to my birthday party tomorrow.— _________.A．I don't B．I won't C．I will D．I'd like to B解析：B【解析】【详解】句意：——明天别忘了来参加我的生日聚会。
——我不会忘的。
考查否定祈使句的答语。
I don't我不会的，一般回答现在时；I won't我不会的，回答将来时；I will我会的，回答将来时；I'd like to我想要。
分析句子可知，此处表示“我不会”的含义，且用来回答明天的事情，故选B。
2．—When and where shall we meet tomorrow?—Let’s _______ it 3:00 p. m. at my home.A．do B．make C．meet D．plan B解析：B【解析】试题分析：句意：--我们明天什么时候在哪见面。
--让我们下午三点在家见面。
A做 B制作C见面 D计划；make it 制定时间。
故选B.考点：考查动词的用法。
3．______ talk in the library.A．Don’t B．Not C．Not to A解析：A【解析】【详解】句意：在图书馆不要说话。
此处是祈使句的否定形式，因此在动词原形前加don’t，故为Don’t+动词原形。
故选A。
4．Peter, here, or I’ll ask you to get out of the library.A．not shout B．don’t shout C．not to shout D．no shout B解析：B【解析】【详解】句意：Peter，不要在这里大喊，否则我会让你从图书馆出去。
not shout不喊；don’t shout 不要大喊；not to shout动词不定式的否定形式；no shout形式错误。
英语英语情态动词测试卷(有答案)含答案解析推荐精选
英语英语情态动词测试卷(有答案)含答案解析推荐精选一、初中英语情态动词1．—We've got everything ready for the picnic.—Do you mean I __________ bring anything with me?A. can'tB. mustn'tC. couldn'tD. needn't【答案】 D【解析】【分析】句意：—我们已经为野餐准备好了一切。
—你的意思是我不必带任何东西吗？A. can't 不能；B. mustn't 表示禁止，一定不要；C. couldn't不能，表示过去时态；D. needn't不必。
结合句意，故选D。
【点评】本题考查情态动词的用法。
2．—How amazing this robot is!—Wow, it has video cameras in its eyes, so it “see” and inter act with people.A. mayB. canC. mustD. should【答案】 B【解析】【分析】句意：—这个机器人多么惊人啊！—哇，在它的眼睛里有摄像机，因此它能看见和人打交道。
A. may 可以，可能；表示许可，B. can 能；表示能力，C. must 必须；D. should应该；根据it has video cameras in its eyes,可知是有能力看见，故选B。
【点评】考查情态动词辨析。
熟记情态动词的含义和用法。
3．— __________I wear a tie to Janet's birthday party?— No,you needn't. But do remember to bring her a present.A. MustB. ShouldC. NeedD. Can【答案】 A【解析】【分析】句意：——我必须戴领带去参加Jane的生日聚会吗？——不，你不必，但是记住给她带个礼物。
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一、选择题1．—The book report is very important. You ________ write it carefully.—But I ________ hand it in now.A．must; must B．have to; mustC．must; have to D．have to; have to2．—Must I finish the work today, Mum?—No, you ________.You can finish it tomorrow.A．mustn't B．can't C．shouldn't D．needn't3．-Listen! A wolf is crying!-It _______ be a wolf, because a wolf never comes out at this time.A．mustn’t B．needn’t C．can’t D．don’t4．I’ve bought a nice necklace for Jo’s birthday. She _____like it, but I’m not s ure.A．can B．may be C．might D．must5．—Is Wendy in the classroom now?—I’m not sure. She ________ be there. I saw her in the library ten minutes ago.A．may not B．must not C．shall not D．would not6．All passengers_____ go through safety check before they take a plane.A．may B．can C．must D．need7．—I can't stop smoking, doctor.—For your health, I'm afraid you ________.A．must B．can C．may D．need8．（江苏省无锡市锡北片2017届九年级下学期期中考试）—Where are you going for your summer holiday?—We go to Yun Nan, but we ha ven’t decided yet.A．should B．will C．may D．must 9．—Susan, someone is waiting for you on the phone. It_______ be your sister, but I’m not sure.—Oh, please tell her to call me_______ because I’m busy now.A．might; later B．must; later C．might; late D．must; late 10．You run with the train when it is coming. It’s dangerous.A．may not B．mustn’t C．needn’t11．—Can you come to my party on Saturday afternoon?—Sorry, I can’t. I ________ meet my friends.A．can’t B．might have to C．needn’t12．—Must we finish the work right now?—No, you ________. You can do it tomorrow.A．needn’t B．shouldn’t C．mustn’t D．can’t 13．—Jack must be in his office, I think.—No, he be in the office. He flew to Canada this morning.A．needn't B．shouldn't C．can't D．mustn't 14．—Must I go out to have dinner with you, Mum?—No, you , my dear. You’re free to make your own decision.A．shouldn’t B．mustn’t C．needn’t D．can’t15．This book _____ Lucy’s. Look! Her name is on the book cover.A．must be B．may be C．can’t be D．mustn’t be 16．— Must I go home? — No, you ________.A．can’t B．mustn’t C．don’t D．needn’t 17．—The food ________be delicious . You ate it up .—You bet . My mum cooked it for me .A．must B．may C．can D．need18．一Hurry up, Mark! Let's cross the road as quickly as possible.一No，you . Don't you see the light is still red?A．couldn't B．wouldn't C．mustn't D．needn't 19．—We've prepared all kinds of foods for the picnic.—Do you mean I___ bring anything?A．can't B．needn't C．mustn't D．won't 20．—Could I call you by the first name?—Yes, you .A．will B．could C．may D．might21．— Could you play the piano when you were 8 years old?— ________.A．Yes, I could B．No, I can’t C．Yes, I can D．No, I won’t22．I see the blackboard. I need to have my glasses.A．can B．can’t C．must D．mustn’t【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【分析】【详解】句意：——这个读书报告很重要。
你必须仔细地写。
——但我现在必须交上它。
考查情态动词。
must必须，表示说话人主观上的看法；have to不得不，必须，强调客观需要。
第一句表示说话人认为对方必须认真写，是主观看法，第二句表示客观需要不得不现在上交，故选C。
2．D解析：D【解析】【详解】句意：-我必须今天做完这个工作吗，妈妈？-不，你不必。
你可以明天完成。
mu stn’t禁止，不要；can’t不能，不会；shouldn’t不应该；needn’t不必，没有必要。
Must 的一般疑问句，肯定回答用must，否定回答应用needn’t。
故选D。
3．C解析：C【解析】【详解】句意：--听! 狼在叫! --它不可能是狼，因为狼从来不会在这个时候出来。
A. mustn’t禁止；B. needn’t没有必要；C. can’t不可能；D. don’t构成一般现在时的否定句。
根据“because a wolf never comes out at this time因为狼从来不会在这个时候出来”，可推断它不可能是狼，故选C。
【点睛】情态动词表推测的用法：can表示“可能”；can’t表示“不可能”；may表示“可能”，must表示“一定”，注意mustn’t表示“禁止”不表示推测，表示否定推测要用can’t.4．C解析：C【解析】【详解】句意：乔的生日我给她买了一条漂亮的项链。
她可能会喜欢，但是我不确定。
考查情态动词表示推测。
can表示能、可以；may表示可能，might是其过去式；must表示一定、必须。
根据题干中but I'm not sure．可知可能性较小的推测，则可用may或者might，B项中may后有系动词be，原句中有动词like，则只能用might。
故选C。
5．A解析：A【解析】【详解】句意：—温迪现在在教室吗？—我不确定。
她可能不在那里，十分钟前我在图书馆见过她。
考查情态动词表推测。
may not可能不；must not一定不要；shall not将不会；would not 将要、会、就会，表示虚拟、假设、条件等。
根据回答句“I’m not sure”，可推测后句应该是说：她可能不在那里。
是对现在情况的推测，may not“可能不”。
故选A。
6．C解析：C【详解】句意：所有乘客在乘坐飞机前必须经过安全检查。
考查情态动词辨析。
may可以，表许可或请求；can能，表能力或许可；must必须，指一定；need需要，指有必要。
根据句意语境可知，安检强调“必须，一定”，故选C。
7．A解析：A【解析】【详解】句意：——我戒不掉烟，医生。
——为了你的健康，恐怕你必须戒掉。
must必须；can 能，会；may可以；need 需要。
根据For your health，可知戒烟有利于健康，是必须的做的事，must表示必须的意思。
故选A。
8．C解析：C【解析】句意：——你暑假打算去哪儿？——我可能去云南，但是我还没有决定。
A. should应该；B. will打算，将；C. may可能；D. must必须。
这里是表示推测。
根据下文“但是我还没有决定”可知上文是“我可能去云南”，结合选项可知选C。
9．A解析：A【解析】【详解】句意：——苏珊，有人在电话里等你。
可能是你妹妹，但我不确定。
——哦，我现在很忙，请告诉她晚点给我打电话。
考查情态动词辨析及副词。
might可能；must一定；later以后；late晚的，根据第一个空后面的but I’m not sure可知，应该是可能，排除B和D，由第二个空前面的call me可知，应该用later，later则可以作为late的比较级形式，做时间副词表示“随后，稍后”，排除C，故选A。
10．B解析：B【解析】【详解】句意：火车来的时候你不能跟它一起跑，这很危险。