语法专题八、情态动词（常考）
情态动词表示讲话人的态度、请求、许可、愿望、可能等。本身具有一定的意义，但不能独立作谓语，没有人称和数的变化，且后面必须跟动词原形。常考的情态动词有：can/could（能够，可以），may/might（可能，可以）， must（必须，一定）， should（应该）， need（必要）， have to（不得不） 等。Need用作情态动词时常用于否定句和疑问句，need还可作实意动词，常用结构need to do sth.
考点1.情态动词+动原
He can play the violin. 他会拉小提琴。
It might snow tomorrow. 明天可能下雪。
We should respect everyone. 我们应该尊重每一个人。
考点2.常考的一般疑问句的回答
—Can you swim
—Yes, I can. /
No, I can’t.
—May I smoke here？
—Yes, you may/can. /Sure. / Certainly. / Of course. /
No, you mustn't / can’t.
—Must we finish the work at once？
—Yes， you must. /
No， you needn't. / No， you don't have to.
（must引导的一般疑问句的否定回答是常考点）
考点3.must必须（强调主观看法）mustn’t表示禁止，不允许
You must study harder this term. 你们这学期必须更加努力学习。（说话者的个人看法）
You mustn’t swim in the river. 你们千万不能去河里游泳。（这条河禁止游泳）
考点4.情态动词表推测
表推测：由强到弱
肯定：must 准是，一定 can 可能 could（可能） may (或许) might（大概）
否定：can’t 不可能 may/ might not 或许不能
can 和 could 表示推测，can 表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比 could 表示的“可能性”要大；用于否定句时，cannot（can't）表示“不可能”。could 则可用于肯定句、否定句和疑问句。
情态动词表推测常考的三点：
十分肯定的推测，肯定句，用must.（一定是）
This book must be Tom’s. There’s his name.
这本书一定是汤姆的，有他名字。
断然否定的推测，否定句，用can’t（一定不是）
—Listen, there is somebody knocking on the door Is it Ms Gao
听，有人敲门？是高老师吗？
—No, it can’t be Ms Gao. I just saw her running on the playground.
不，不可能是高老师。我刚才看见她在操场是跑步呢。
3.不太确定，没把握，肯定句，用may/might（可能）
— Listen, who is knocking on the door 听，谁在敲门？
It might be Ms Zhao. I’m not sure.可能是赵老师。我不确定。
1. (2014·江苏省扬州市·历年真题)-Excuse me，may I keep the book a little longer？
-Sorry．You ________ return it today．
A. must B. mustn't C. can D. can't
2. (2014·天津市·历年真题)Look at the "No parking" sign. You ______ park your car here.
A. should B. must C. needn't D. mustn't
3. (2022·天津市·历年真题)—____ I finish the writing now？
—No，you______.You can give it to me next Monday.
A. Must；mustn't B. Must；needn't C. May；shouldn't D. Need；can't
4. (2022·全国·历年真题)—Is that man Mr. Green
—It ______ be him. He has gone to Paris on business.
A. can B. must C. can't D. mustn't
5. (2022·全国·历年真题)—Whose textbook is it Is it Jenny's
—No, it ______ be Jenny's. Look, Helen's name is on the cover. I think it ______ be Helen's.
A. can't; must B. mustn't; must C. can't; may D. mustn't; may
中考语法—情态动词专项练习
（共计50小题，每小题2分，总分100分。）
—I think we need to sit down and have a talk.
—I ________ agree more. Let's take the bench over there.
A. could B. couldn't C. should D. shouldn't
2. — May I take this magazine out of the reading room
— No, you _________. You read it in here.
A. mightn't B. won't C. needn't D. mustn't
3. —Excuse me, is this the way to No.1 Middle School
—Sorry, I'm not sure. But it ______ be.
A. must B. Can C. need D. may
4. — Mum, ________ I visit the Movie Museum tomorrow
— I'm afraid you can't. It is closed on Monday.
A. must B. may C. should D. need
5. —Must I return the book tomorrow morning
—No, you ____ You can keep it longer.
A. mustn't B. can't C. needn't D. couldn't
6. —Who's singing in the garden？
—It ________ be Tom．He always practices singing at this time．
A. can't B. need C. must D. mustn't
7. —I saw Mr. Lin his office just now.
—No, it ______ be him. He has ______ Guangzhou and will be back in two days.
A. mustn't; gone to B. mustn't; been to
C. can't; been to D. can't; gone to
8. David, ________ you please sweep the floor and take out (倒掉) the rubbish
A. could B. may C. might D. must
9. -Lingling，can I use your e-dictionary？
-Sure．But you _____ return it after class．
A. must B. can C. may D. would
10. -Is Mr Brown driving here？
-I'm not sure．He ______ come by train．
A. may B. shall C. need D. must
11. —Is that man Mr．Smith？
—It ______ be him．He has gone to New York on business．
A. may not B. needn't C. can't D. mustn't
12. You take me to the station. My brother's taking me.
A. can't B. mustn't C. shouldn't D. don't have to
13. —You park here! Look at the sign. It says “No parking".
—Sorry, I didn't notice that sign just now.
A. won't B. needn't C. mustn't D. couldn't
14. —Must we finish the work today？
—________. We have something else to do tomorrow．
A. Yes, we can B. No, we can't C. Yes, we must D. No, we needn't
15. —Whose is the pencil box
—It ________ be Tom’s. Look at his name on the cover!
A. can B. may C. must D. need
16. -Must I finish the work tonight？-No，you ________．You can do it tomorrow．
A. can't B. mustn't C. needn't D. couldn't
17. After a long walk, the old man__________be tired now.
A. can B. has to C. must D. need
18. If you wish，you come in and have a cup of coffee．
A. may B. must C. would D. should
19. The girl in the classroom ______ be Sarah. She has gone to the library.
A. may B. must C. can't D. needn't
20. He______ speak English very well although he has studied it for only one year．
A. mustn’t B. can’t C. must D. can
21. Please don't make so much noise. I ________ hear the speaker very well.
A. needn't B. mustn't C. can't D. shouldn't
22. We_____ use mobile phones when the plane takes off.
A. may not B. shouldn't C. needn't D. mustn't
23. — I use your dictionary
—Sure, here you are.
A. Must B. May C. Need D. Should
24. ﹣Can I swim in the lake，Mum？It’s so hot.
﹣No，you_____.The sign says "No swimming".
A. mustn’t B. needn’t C. wouldn’t D. shouldn’t
25. —_____you tell us a story in English？
—I think I can do it. Let me try.
A. Need B. Can C. Should D. Must
26. We ______ have a graduation ceremony next week, but I’m not sure.
A. can B. might C. must D. will
27. Children under 12 years old_____ride sharing bikes. It's too dangerous.
A. shouldn’t allow to B. shouldn’t allow
C. shouldn’t be allowed to D. shouldn’t be allowed
28. That man over there_____be Mr. Yang because he went to Shanghai yesterday.
A. must B. mustn't C. need D. can't
29. —I wonder if this glass is Tom’s.
—It ______ be his. His was broken just now.
A. mustn’t B. may not C. can’t D. shouldn’t
30. —______ I invite my friends to the party on Saturday
—Of course you can.
A. Have to B. Must C. Can D. Can't
31. —Must I hand in my science report now
—No, you ______. You can ______ it to me tomorrow.
A. haven’t to; give B. don't have to; give
C. haven’t to; will give D. don't have to; will give
32. —Mum, could I volunteer at a pet hospital
—Yes, you ______. It is very meaningful to help animals in your free time.
A. can B. must C. need D. could
33. I'll ______ walk to school if I miss the school bus.
A. can B. have to C. must D. could
34. There ______ something wrong with my computer. It can’t work these days.
A. can’t be B. must be C. may be D. might be
35. People ______ talk on a mobile phone while they are driving.
A. shouldn't B. needn't C. must D. can
36. — Only ten tickets What do you mean There _____ be twelve.
— Sorry, Linda. Jacky and Tim took two tickets away.
A. should B. will C. can D. may
37. -Look at the boy playing basketball on the ground．Is it George？
-It ________ be him．He told me he would play basketball after class，but he's not sure．
A. mustn't B. must C. can't D. may
38. —You ______ take photos here! Look at the sign. It says "No photos".
— Sorry, I won't.
A. must B. need C. mustn't D. needn't
39. —Must I finish the job this Friday
—No, you ______. You can finish it next Monday.
A. can't B. need C. needn't D. mustn't
40. What an amazing robot! It ______ cook more than 5,000 dishes.
A. shall B. need C. must D. can
41. —Hi, Ann. Do you know where your English teacher Mr. Liu is
—He ______ be in the classroom. It's the English class now.
A. can B. must C. may D. need
42. — Hi, Carl! I'm leaving for Chengdu this weekend.
— Cool! But I ______ get away until the end of July.
A. shouldn't B. can't C. needn't D. mustn't
43. —Sandy, is Mr Li in the teachers' office now？
—I am not sure. He ______ be there.
A. must B. can't C. mustn't D. may
44. The man in my room ______ be my brother. He is still in France.
A. couldn't B. mustn't C. needn't D. can't
45. Bill is running so fast! I ______ believe my eyes.
A. needn't B. shouldn't C. mustn't D. can't
46. — Must we clean the classroom now
—______. You can clean it after school.
A. Yes, you must B. Yes, you can C. No, you needn't D. No, you mustn't
47. —What will the weather be like tomorrow
—It ______ be rainy, cloudy or sunny. I am not sure.
A. must B. may C. can't D. should
48. —May I fish here
—Sorry, you ______. Look at the sign "No fishing"!
A. may B. mustn't C. can D. needn't
49. —Must I wash my clothes at once, mom？
—No, you____ .You _______ wash them before 5：00 p.m.
A. needn't；may B. mustn't；may C. needn't；need D. mustn't；must
50. —Must I do my homework now, Mum
—_______. You can do it tomorrow.
A. No, you needn't B. No, you mustn't C. Yes, you need D. Yes, you must语法专题八、情态动词（常考）
情态动词表示讲话人的态度、请求、许可、愿望、可能等。本身具有一定的意义，但不能独立作谓语，没有人称和数的变化，且后面必须跟动词原形。常考的情态动词有：can/could（能够，可以），may/might（可能，可以）， must（必须，一定）， should（应该）， need（必要）， have to（不得不） 等。Need用作情态动词时常用于否定句和疑问句，need还可作实意动词，常用结构need to do sth.
考点1.情态动词+动原
He can play the violin. 他会拉小提琴。
It might snow tomorrow. 明天可能下雪。
We should respect everyone. 我们应该尊重每一个人。
考点2.常考的一般疑问句的回答
—Can you swim
—Yes, I can. /
No, I can’t.
—May I smoke here？
—Yes, you may/can. /Sure. / Certainly. / Of course. /
No, you mustn't / can’t.
—Must we finish the work at once？
—Yes， you must. /
No， you needn't. / No， you don't have to.
（must引导的一般疑问句的否定回答是常考点）
考点3.must必须（强调主观看法）mustn’t表示禁止，不允许
You must study harder this term. 你们这学期必须更加努力学习。（说话者的个人看法）
You mustn’t swim in the river. 你们千万不能去河里游泳。（这条河禁止游泳）
考点4.情态动词表推测
表推测：由强到弱
肯定：must 准是，一定 can 可能 could（可能） may (或许) might（大概）
否定：can’t 不可能 may/ might not 或许不能
can 和 could 表示推测，can 表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比 could 表示的“可能性”要大；用于否定句时，cannot（can't）表示“不可能”。could 则可用于肯定句、否定句和疑问句。
情态动词表推测常考的三点：
十分肯定的推测，肯定句，用must.（一定是）
This book must be Tom’s. There’s his name.
这本书一定是汤姆的，有他名字。
断然否定的推测，否定句，用can’t（一定不是）
—Listen, there is somebody knocking on the door Is it Ms Gao
听，有人敲门？是高老师吗？
—No, it can’t be Ms Gao. I just saw her running on the playground.
不，不可能是高老师。我刚才看见她在操场是跑步呢。
3.不太确定，没把握，肯定句，用may/might（可能）
— Listen, who is knocking on the door 听，谁在敲门？
It might be Ms Zhao. I’m not sure.可能是赵老师。我不确定。
1. (2014·江苏省扬州市·历年真题)-Excuse me，may I keep the book a little longer？
-Sorry．You ________ return it today．
A. must B. mustn't C. can D. can't
【答案】A
【解析】must表示必须；mustn't表示不准；can表示会；can't表示不会．根据语境sorry和句意你今天必须归还它．故选：A。
2. (2014·天津市·历年真题)Look at the "No parking" sign. You ______ park your car here.
A. should B. must C. needn't D. mustn't
【答案】D
【解析】句意：看看“禁止停车”的牌子。你不可以把车停在这儿。A.should应该；B.must必须；C.needn't 不必；D.mustn't禁止。根据“No parking”可知这里禁止停车，故用情态动词mustn't，故选 D。
3. (2022·天津市·历年真题)—____ I finish the writing now？
—No，you______.You can give it to me next Monday.
A. Must；mustn't B. Must；needn't C. May；shouldn't D. Need；can't
【答案】B
【解析】Must"必须"；mustn't"禁止"；needn't"不需要"；May"可能"；shouldn't"不应该"；Need"需要"；can't"不能"。根据You can give it to me next Monday（你可以下周一给我）可知，你不需要现在写完，回答needn't"不需要"，要用must提问。故选：B。
4. (2022·全国·历年真题)—Is that man Mr. Green
—It ______ be him. He has gone to Paris on business.
A. can B. must C. can't D. mustn't
【答案】C
【解析】句意：——那个人是格林先生吗？——不可能是他。他到巴黎出差去了。can可能（表推测时通常只用于否定句和疑问句，一般不用于肯定句）；must一定（表示肯定的推测）；can't不可能（表示否定的推测）；mustn't禁止（不用来表推测）。根据He has gone to Paris on business.可知，那个人不可能是格林先生，此处表示否定的推测，用can't。故选C。
5. (2022·全国·历年真题)—Whose textbook is it Is it Jenny's
—No, it ______ be Jenny's. Look, Helen's name is on the cover. I think it ______ be Helen's.
A. can't; must B. mustn't; must C. can't; may D. mustn't; may
【答案】A
【解析】句意：——它是谁的教科书？是珍妮的么？——不是，它不可能是珍妮的，看，封面上是海伦的名字，我认为它一定是海伦的。can't不可能，不能；must必须，一定；may可能，也许；mustn't 不可以，禁止；第一个空，根据Helen's name is on the cover"封面上是海伦的名字"可知，"不可能"是珍妮的教科书。表示否定推测用can't；第二个空，根据Helen's name is on the cover"封面上是海伦的名字"可知，"一定"是海伦的。用must。故选A。
中考语法—情态动词专项练习
（共计50小题，每小题2分，总分100分。）
(2015·江苏省无锡市·历年真题)—I think we need to sit down and have a talk.
—I ________ agree more. Let's take the bench over there.
A. could B. couldn't C. should D. shouldn't
【答案】B
【解析】句意：——我认为我们需要坐下来谈一谈。——我完全同意。我们到那边凳子上坐。I couldn't agree more.我完全同意。后句“Let's take the bench over there.”（我们在那边的凳子上坐吧）可以推测出，我同意。故选B。
(2014·江苏省苏州市·历年真题)— May I take this magazine out of the reading room
— No, you _________. You read it in here.
A. mightn't B. won't C. needn't D. mustn't
【答案】D
【解析】句意：——我可以把这份杂志带出阅览室吗？——不，你不能。你可以在这里看。mightn't可能不；won't将不；needn't不必；mustn't不能，不准。根据No和You read it in here.可知，你不能把这份杂志带出阅览室。故选D。
(2015·江苏省宿迁市·历年真题)—Excuse me, is this the way to No.1 Middle School
—Sorry, I'm not sure. But it ______ be.
A. must B. Can C. need D. may
【答案】D
【解析】句意：——打扰一下，这是去第一中学的路吗？——抱歉，我不确定，但是它可能是吧。A.must一定，必须，具有很大的可能性；B.can可能，一般表示能力，肯定式不表示推测；C.need需要；D.may可能，表示推测时，可能性不大。根据I'm not sure，可知这里表示不确定，可能性有，但不是很大，结合四个选项及句意，故选D。
(2015·上海市·历年真题)— Mum, ________ I visit the Movie Museum tomorrow
— I'm afraid you can't. It is closed on Monday.
A. must B. may C. should D. need
【答案】B
【解析】句意：——妈妈，明天我可以去参观电影博物馆吗？——恐怕不能。周一关闭。must必须；may可以；should应该；need需要。根据答语可知，这是请求许可，故选B。
(2015·新疆维吾尔自治区克拉玛依市·历年真题)—Must I return the book tomorrow morning
—No, you ____. You can keep it longer.
A. mustn't B. can't C. needn't D. couldn't
【答案】C
【解析】考查情态动词。句意：——明天上午我必须还书吗？——不，不必。你可以借的时间更长一点。A.mustn't禁止，不允许；B.can't不能；C.needn't不必；D.couldn't不可能。回答以must引导的一般疑问句，肯定回答用Yes, sb must.；否定回答用No, sb needn't.故选C。
(2015·辽宁省丹东市·历年真题)—Who's singing in the garden？
—It ________ be Tom．He always practices singing at this time．
A. can't B. need C. must D. mustn't
【答案】C
【解析】句意：——谁正在花园里面唱歌？——一定是汤姆。他总是在这个时间练习唱歌。can't不能；need需要；must必须，一定；mustn't不一定，不可以。根据He always practices singing at this time.可知他总是在这个时间练习唱歌。是一种肯定的推测，而且可能性很大，所以在这里用must。故选C。
(2021·全国·单元测试)—I saw Mr. Lin his office just now.
—No, it ______ be him. He has ______ Guangzhou and will be back in two days.
A. mustn't; gone to B. mustn't; been to
C. can't; been to D. can't; gone to
【答案】D
【解析】句意：——我刚才看见林先生在他的办公室。——不，不可能是他。他去了广州两天后回来。mustn't表示禁止，can't表示不可能，表示否定的推测，have/has gone to表示去了某地，还没回来，have/has been to表示去过某地，已经回来了，根据句意“他去了广州，两天后回来。”可知，不可能是他，此处是否定的推测，用can't，他还没回来，用has gone to，故选D。
8. (2020·甘肃省·单元测试)David, ________ you please sweep the floor and take out (倒掉) the rubbish
A. could B. may C. might D. must
【答案】A
【解析】句意：大卫，请你扫地并把垃圾倒掉好吗？A.could能，可以，是can的婉转形式；B.may可能，可以，常用于委婉的请求；C.might可能，语气委婉；D.must一定，必须。Will/Would/Can/Could you please... 意为“请你做某事，好吗？”，其中would与could均表示委婉的语气。故选A。
9. (2014·山东省德州市·历年真题)-Lingling，can I use your e-dictionary？
-Sure．But you _____ return it after class．
A. must B. can C. may D. would
【答案】A
【解析】答案：A can能够，表示能力；must表示必须；may表示可能；would表示愿意，将要；根据But，可知上下文是转折关系，而must可表示"一定，必须"的意思．故选A．--玲玲，我能用一下你的电子词典吗？--当然．但是你必须课下归还．
主要考查情态动词，一定要注意情态动词的含义和用法，然后根据句意，来推测所需的情态动词.
10. (2016·四川省绵阳市·历年真题)-Is Mr Brown driving here？
-I'm not sure．He ______ come by train．
A. may B. shall C. need D. must
【答案】A
【解析】答案：A．may可能；shall将要；need需要；must一定，必须．根据I'm not sure，可知这里的意思是我不确定，可能会坐火车来．may可能．故选A．
11. (2023·新疆维吾尔自治区巴音郭楞蒙古自治州·期末考试)—Is that man Mr．Smith？
—It ______ be him．He has gone to New York on business．
A. may not B. needn't C. can't D. mustn't
【答案】C
【解析】may not可能不；needn't不必；can't不可能；mustn't不可以。根据He has gone to NewYork on business，可知Smith去纽约了，所以那个人不可能是他。故选C。
——那个人是Smith先生吗？
——不可能是他。他去纽约出差了。
本题主要考查情态动词的用法。合理理解句意以及各项的意思是解答本题的关键所在。
12. (2016·江西省·历年真题)You take me to the station. My brother's taking me.
A. can't B. mustn't C. shouldn't D. don't have to
【答案】D
【解析】句意：你没必要带我去车站。我哥哥会来接我。A.can't不能；B.mustn't禁止；C.shouldn't不应该；D.don't have to没必要。根据语境，故选D。
13. (2015·江苏省苏州市·历年真题)—You park here! Look at the sign. It says “No parking".
—Sorry, I didn't notice that sign just now.
A. won't B. needn't C. mustn't D. couldn't
【答案】C
【解析】句意: ——你不可以在这里停车！看这个标牌，上面写着“禁止停车”。——对不起，我刚才没看见这个标牌。本题考查情态动词。won't不会; needn’t不必；mustn't不许，禁止；couldn't不能。根据题干中的Look at the sign. It says “No parking”可知，此处禁止停车。故选C。
14. (2016·重庆市·历年真题)—Must we finish the work today？
—________. We have something else to do tomorrow．
A. Yes, we can B. No, we can't C. Yes, we must D. No, we needn't
【答案】C
【解析】句意：——我们必须今天完成工作吗？——是的，必须。明天我们还有其他的事情要做。在回答must开头的一般疑问句时，肯定回答用must，否定回答用needn't或don't have to。上文是情态动词must的一般疑问句，结合下文是说明天要做其他的事情，故也就是今天必须完成，故用肯定回答Yes，we must。故选C。
15. (2012·河北省·历年真题)—Whose is the pencil box
—It ________ be Tom’s. Look at his name on the cover!
A. can B. may C. must D. need
【答案】C
【解析】本题考查情态动词的用法。根据后面半句“Look at his name on the cover!”可知，盖子上有他的名字。因此，这个铅笔盒一定是Tom的。must表示必须，一定。句意为：这是谁的铅笔盒 一定是Tom的，看铅笔盒上有他的名字。故选C。
16. (2015·贵州省黔西南布依族苗族自治州·历年真题)-Must I finish the work tonight？-No，you ________．You can do it tomorrow．
A. can't B. mustn't C. needn't D. couldn't
【答案】C
【解析】根据No，you ，You can do it tomorrow，可知今天晚上不必完成这项工作，在这里是作出否定回答．由must引导的一般疑问句表示否定回答时需要用needn't或don't have to来回答．故选C．
17. (2014·全国·历年真题)After a long walk, the old man__________be tired now.
A. can B. has to C. must D. need
【答案】C
【解析】can表示会；has to表示不得不；must表示一定；need表示需要．根据语境和句意老人一定累了．故选：C．
翻译：经过了一段长时间的散步，老人现在一定很累了
本题考查情态动词．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．have to表示客观上不得不；must表示主观上必须．
18. (2015·湖北省武汉市·历年真题)If you wish，you come in and have a cup of coffee．
A. may B. must C. would D. should
【答案】A
【解析】may表示可以，可能，但可能性较弱；must则意为"肯定，必然"可能性较大，而且语气坚定，有"一定，必须"的强制性；would 将要，会：表示将来的计划；should 应该：表示责任。根据句意，你可以进来喝一杯咖啡，表示推测，所以用may，故选A。
19. (2016·山东省青岛市·历年真题)The girl in the classroom ______ be Sarah. She has gone to the library.
A. may B. must C. can't D. needn't
【答案】C
【解析】句意：在教室里的女孩不可能是Sarah。她去图书馆了。A.may可能；B.must一定，必须；C.can't不可能；D.needn't不必。根据语境，故选C。
20. (2016·重庆市·历年真题)He______ speak English very well although he has studied it for only one year．
A. mustn’t B. can’t C. must D. can
【答案】D
【解析】答案：D 考查情态动词，mustn't表示禁止不许可，can't不能，不可能；must必须，一定，can表示能力，许可，句子中“although…”引导让步状语从句，表示转折关系，意思为“虽然他只学英语一年，但是他英语能说得很好。”表示能够做某事，用情态动词can，故选：C。
21. (2021·河北省石家庄市·期末考试)Please don't make so much noise. I ________ hear the speaker very well.
A. needn't B. mustn't C. can't D. shouldn't
【答案】C
【解析】句意：请别这么吵，我听不清演讲者的话了。A. needn't 不必；B. mustn't 不可以；C. can't 不能；D. shouldn't 不应该。根据 I ______ hear the speaker very well. 可知这里的意思是不能很好的听清演讲者的话了。can't 不能。故选C。
22. (2014·云南省·历年真题)We_____ use mobile phones when the plane takes off.
A. may not B. shouldn't C. needn't D. mustn't
【答案】D
【解析】本题考查的是情态动词的用法，may not的意思是不可以，语气较委婉，shouldn't是不应该的意思，表示建议，needn't是不必的意思，mustn't是一定不的意思，表示禁止，我们知道，在飞机上是绝对不能使用手机的，故选D。
23. (2020·辽宁省阜新市·历年真题)— I use your dictionary
—Sure, here you are.
A. Must B. May C. Need D. Should
【答案】B
【解析】句意：——我可以用一下你的字典吗？——当然，给你。Must必须；May可以；Need需要；Should应该。根据Sure, here you are“当然，给你”可知，表示委婉的请求，用May可以，故选B。
24. (2022·广西壮族自治区·历年真题)﹣Can I swim in the lake，Mum？It’s so hot.
﹣No，you_____. The sign says "No swimming".
A. mustn’t B. needn’t C. wouldn’t D. shouldn’t
【答案】A
【解析】句意：——妈妈，我能在湖里游泳吗？天气太热了。——不，你不能。标牌上写着"禁止游泳"。根据The sign says "No swimming".标牌上写着"禁止游泳"。可知，"不允许"去游泳。用mustn t表示禁止；绝对不能。故选A。
25. (2022·广西壮族自治区·历年真题)—_____you tell us a story in English？
—I think I can do it. Let me try.
A. Need B. Can C. Should D. Must
【答案】B
【解析】句意：——你能用英语给我们讲个故事吗？——我想我能做到。让我试试。Need需要；Can能；Should应该；Must必须。根据下文I think I can do it. Let me try.（我想我能做到。让我试试。）可知，应是“你能用英语给我们讲个故事吗？”。故选A。
26. (2022·全国·历年真题)We ______ have a graduation ceremony next week, but I’m not sure.
A. can B. might C. must D. will
【答案】B
【解析】句意：下周我们可能会举行毕业典礼，但我不确定。A. can能；B. might可能；C. must必须；D. will将，将要。由后面句子“but I’m not sure.”可知，此处表示下周我们可能会举行毕业典礼，表可能性不大的推测，用might。故选B。
27. (2022·广西壮族自治区·历年真题)Children under 12 years old_____ride sharing bikes. It's too dangerous.
A. shouldn’t allow to B. shouldn’t allow
C. shouldn’t be allowed to D. shouldn’t be allowed
【答案】C
【解析】被动语态的用法。句意：12岁以下的孩子们不应该被允许骑共享单车。太危险了。根据语境可知应用allow的被动语态形式be allowed to do sth.被允许做某事。故选C。
28. (2022·云南省·历年真题)That man over there_____be Mr. Yang because he went to Shanghai yesterday.
A. must B. mustn't C. need D. can't
【答案】D
【解析】句意：那边的那个人不可能是杨先生，因为他昨天去了上海。must必须；mustn't禁止；need需要；can't不可能。根据because he went to Shanghai yesterday"因为他昨天去了上海。"可知，那边那个人"不可能"是杨先生。表示否定推测用can't。故选：D。
29. (2022·全国·历年真题)—I wonder if this glass is Tom’s.
—It ______ be his. His was broken just now.
A. mustn’t B. may not C. can’t D. shouldn’t
【答案】C
【解析】句意：——我想知道这个玻璃杯是不是汤姆的。——不可能是他的。他的刚才打碎了。mustn't禁止；may not也许不；can't不可能；shouldn't不应该。结合His was broken just now.可知，此处表示否定推测，用can't。
30. (2022·全国·历年真题)—______ I invite my friends to the party on Saturday
—Of course you can.
A. Have to B. Must C. Can D. Can't
【答案】C
【解析】句意：——星期六我可以邀请我的朋友来参加派对吗？——你当然可以。have to不得不；must必须；can可以；can't不可以。can询问“是否可以”，用来提问许可或请求做某事。所以答案为C选项。
31. (2022·全国·历年真题)—Must I hand in my science report now
—No, you ______. You can ______ it to me tomorrow.
A. haven’t to; give B. don't have to; give
C. haven’t to; will give D. don't have to; will give
【答案】B
【解析】句意：——我现在必须上交我的科学报告吗？——不，你不必。你可以明天给我。must引导的问句的否定回答用needn't或don't have to。根据第二空前的情态动词can可知，第二空用行为动词原形，由此可知，B项符合句意。
32. (2022·全国·历年真题)—Mum, could I volunteer at a pet hospital
—Yes, you ______. It is very meaningful to help animals in your free time.
A. can B. must C. need D. could
【答案】A
【解析】句意：——妈妈，我能去宠物医院做志愿者吗 ——是的，你可以。在你的空闲时间帮助动物是很有意义的。can能，可以；must必须；need需要；could可以。could引导的一般疑问句，表示委婉请求，答语中用can/can't。此处作肯定回答，用can。
33. (2022·全国·历年真题)I'll ______ walk to school if I miss the school bus.
A. can B. have to C. must D. could
【答案】B
【解析】句意：如果我错过了校车，我就得走路上学了。can可能（表推测时通常只用于否定句和疑问句，一般不用于肯定句）；have to不得不（表示一种客观的需要）；must必须（表示一种主观的义务和必要）；could可能（can的过去式）。根据if I miss the school bus可知，如果我错过了校车，我就得走路上学了，此处表示一种客观的需要，用have to符合语境。故选B。
34. (2022·全国·历年真题)There ______ something wrong with my computer. It can’t work these days.
A. can’t be B. must be C. may be D. might be
【答案】B
【解析】句意：我的电脑一定是出问题了。这些天它无法运行了。can't不可能（表示否定的推测）；must一定（表示肯定的推测）；may可能（表示把握不大的推测）；might可能（may的过去式）。根据It can't work these days.可知，我的电脑一定是出问题了，此处用must表示肯定的推测。故选B。
35. (2022·天津市市辖区·期中考试)People ______ talk on a mobile phone while they are driving.
A. shouldn't B. needn't C. must D. can
【答案】A
【解析】句意：人们开车时不应该打电话。A.shouldn't不应该；B.needn't不需要；C.must必须；D.can能,，能狗。根据常识可知，开车打电话是不应该的。故选A。
36. (2021·全国·单元测试)— Only ten tickets What do you mean There be twelve.
— Sorry, Linda. Jacky and Tim took two tickets away.
A. should B. will C. can D. may
【答案】A
【解析】句意：——只有十张票？什么意思？应该有十二张。——对不起，琳达。杰基和蒂姆拿走了两张票。should应该；will将会；can能；may可以。根据Only ten tickets？"只有十张票？"及Jacky and Tim took two tickets away"杰基和蒂姆拿走了两张票"可知，"应该"有十二张票。故选：A。
37. (2013·甘肃省兰州市·历年真题)-Look at the boy playing basketball on the ground．Is it George？
-It ________ be him．He told me he would play basketball after class，but he's not sure．
A. mustn't B. must C. can't D. may
【答案】D
【解析】答案：D．mustn't 禁止，一定不；must必须，一定； can't不能，可能不；may可能．根据He told me he would play basketball after class，but he's not sure，可知他告诉我他会在课后打篮球，但是他不确定，在这里表示的可能性不是很大，一般用may表示．may可能．故选：D．
38. (2021·云南省·历年真题)—You ______ take photos here! Look at the sign. It says "No photos".
— Sorry, I won't.
A. must B. need C. mustn't D. needn't
【答案】C
【解析】句意：——禁止在这里拍照！看那个牌子，上面写着"禁止拍照"。——对不起，我不会了。must必须；need需要；mustn't禁止、绝对不能；needn't不必。根据No photos"禁止拍照"，故选C.
39. (2022·四川省遂宁市·模拟题)—Must I finish the job this Friday
—No, you ______. You can finish it next Monday.
A. can't B. need C. needn't D. mustn't
【答案】C
【解析】句意：——这个星期五我必须完成这项工作吗？——不，你不必。你可以下周一完成。can't不能；need需要；needn't不必；mustn't禁止。Must开头的一般疑问句，否定回答用No, 主语+needn't "不，某人不必”。故选：C。
40. (2021·江苏省连云港市·历年真题)What an amazing robot! It ______ cook more than 5,000 dishes.
A. shall B. need C. must D. can
【答案】D
【解析】句意：多么神奇的机器人！它可以烹饪5000多道菜。shall应该；need需要；must必须；can可以，能够。根据句意，故选D。
41. (2021·贵州省黔东南苗族侗族自治州·历年真题)—Hi, Ann. Do you know where your English teacher Mr. Liu is
—He ______ be in the classroom. It's the English class now.
A. can B. must C. may D. need
【答案】B
【解析】句意：——嗨，安。你知道你的英语老师刘先生在哪里吗？——他肯定在教室里。现在是英语课。A. 可能，B. 一定，肯定，C. 可能，D. 需要，根据It's the English class now.可知，英语老师肯定在教室里，must表示肯定推测，故选B。
42. (2021·全国·单元测试)一Hi, Carl! I'm leaving for Chengdu this weekend.
一Cool! But I ______ get away until the end of July.
A. shouldn't B. can't C. needn't D. mustn't
【答案】B
【解析】句意：——嗨，卡尔！这个周末我要去成都了。——真酷！但我直到7月底才能离开。shouldn't 不应该，can't不能，needn't不需要，mustn't 不必，根据句意我直到7月底才能离开。不能离开直到7月底，选项B正确。故选B。
43. (2021·全国·单元测试)—Sandy, is Mr Li in the teachers' office now？
—I am not sure. He ______ be there.
A. must B. can't C. mustn't D. may
【答案】D
【解析】句意：——桑迪，李先生现在在教师办公室吗？——我不确定。他可能在那里。A.肯定，B.不可能，C.禁止，D.可能，根据汉语意思：我不确定。说明后面是一种可能性，may可能，故选D。
44. (2021·辽宁省阜新市·历年真题)The man in my room ______ be my brother. He is still in France.
A. couldn't B. mustn't C. needn't D. can't
【答案】D
【解析】句意：我房间里的那个人不可能是我哥哥，他还在法国。根据后半句汉语意思：他还在法国。说明不可能是我哥哥，can't不可能，表示否定的推测。故选D。
45. (2021·吉林省长春市·历年真题)Bill is running so fast! I ______ believe my eyes.
A. needn't B. shouldn't C. mustn't D. can't
【答案】D
【解析】句意：比尔跑得太快了！我不能相信我的眼睛。A. 不必，不需要；B. 不应该；C. 禁止，不准；D. 不能。根据：I _________believe my eyes可知：我不能相信我的眼睛，用can't不能，故选D。
46. (2021·辽宁省锦州市·历年真题)— Must we clean the classroom now
—______. You can clean it after school.
A. Yes, you must B. Yes, you can C. No, you needn't D. No, you mustn't
【答案】C
【解析】句意：——我们现在必须打扫教室吗？——不，不必。你可以放学后打扫。根据以must开头的一般疑问句，肯定回答是：Yes, 主语+must. 否定回答是：No, 主语+needn't或者No, 主语+don't/doesn't have to。故选C。
47. (2021·辽宁省朝阳市·历年真题)—What will the weather be like tomorrow
—It ______ be rainy, cloudy or sunny. I am not sure.
A. must B. may C. can't D. should
【答案】B
【解析】句意：——明天天气怎么样？——可能下雨，多云或晴天。我不确定。must必须；may可能；can't不能；should应该。根据I am not sure"我不确定"可知，表示肯定推测用may。故选：B。
48. (2021·辽宁省营口市·历年真题)—May I fish here
—Sorry, you ______. Look at the sign "No fishing"!
A. may B. mustn't C. can D. needn't
【答案】B
【解析】句意：——我可以在这里钓鱼吗？——对不起，你不可以。看“禁止钓鱼”的牌子！A可以，B不可以，禁止，C能，D不必，根据后面的汉语意思说明是禁止钓鱼的，mustn't表示不可以，禁止。故选B。
49. (2021·全国·单元测试)—Must I wash my clothes at once, mom？
—No, you____. You _______ wash them before 5：00 p.m.
A. needn't；may B. mustn't；may C. needn't；need D. mustn't；must
【答案】A
【解析】考查情态动词。 must必须，mustn't表禁止，need需要，may可以，can't不可能，can能够，may not可能不，should应该。情态动词must表示必要性或重要，意思是"一定、必须"，通常用于肯定句及疑问句。must的否定式must not/mustn't,意思是"不应该、禁止"，语气较强烈。由must引出的一般疑问句，肯定回答用must,否定回答用needn't, don't need to或don't have to均可，但不用mustn't,因为mustn't表示"不许、禁止"的意思，与问句的原意不符。情态动词may表示允许；但是还可以表示给予允许（即自己允许别人做某事）。根据问句—Must I wash my clothes at once, mom？-妈妈，我必须马上洗衣服吗？答语应为—No, you needn't. You may wash them before 5：00 p.m.-不必了。你可以在下午5点前洗。 故选：A。
50. (2012·江苏省宿迁市·历年真题)—Must I do my homework now, Mum
—_______. You can do it tomorrow.
A. No, you needn't B. No, you mustn't C. Yes, you need D. Yes, you must
【答案】A
【解析】句意：——妈妈，我现在必须做我的作业吗？——不，你不需要。你可以明天做。考查情态动词的用法。根据答语“可以在明天做”，可知现在没必要做；用must提问的否定回答，用needn't。故选A。
