中考英语语法丨情态动词(附练习题及答案解析)

1、(3)表示可能，可以指过去时间，也可以指现在时间，表示语气缓和中考英语语法I情态动词(附练习题及答案解析)情态动词一、can 和 could1、can的用法(1)表示体力和脑力方面的能力。(2)表示对现在的动作或状态进行主观的猜测，主要用在否定句和疑问句中。(3)表示可能性，理论上的可能性，意为“有时候可能会”，可用于肯定句。(4)表示允许，意思与 may接近。(5)表示说话人的推测、怀疑、惊异、猜测或不肯定等，主要用于否定句、疑问句或感叹句中。(6) can的特殊句型cannot too / enough 表示"无论怎么 也不过分"，"越 越好”。cannot

2、but+ do sth. 表示“不得不，只好”。2、could的用法(1)表示能力，指的是过去时间。(4)委婉客气地提出问题或陈述看法，指的是现在时间。主要用于疑问句，回答时用 can。3、can与could的区别can表推测时只用于否定句和疑问句(could无此限制)。couldn ' t的可能性比can ' t小。4、can 与 be able to 的区别(1)现在时：无区别，但后者不常用。(2)完成时;can没有完成时，此时要用 have (has,had ) been able to 。(3)将来时：can没有将来时，要用 will be able to 。(4)过去

3、时：could表示一般能力，was/were able to表示在具体场合通过努力成功做成某事的能力。二、may 和 might1、may的用法(1)表示询问或说明一件事可不可以做。(2)表示一件事或许会发生或某种情况可能会存在，通常用在肯定句和否定句中。注意：表示可能性时，can' t语气强，表示“不可能"，may not语气弱，表示“可能不”。2、might的用法(1)表示询问或允许，指的是过去时间may(2)表示可能发生的事，可以指过去时间，也可以指现在时间，语气更加不肯定，可能性比小一些。3、may与might 的特殊用法(1) "may+主语+动词原形”表

4、示祝愿。(2) "may/ might well+动词原形”表示(完全)能，很可能。(3) “may/ might as well+ 动词原形”表示最好，满可以，倒不如。(4) may be是"情态动词+系动词be”结构，表示"可能有，可能在"，否定式为may not bemaybe是一个词，为副词，意为“大概，或许，可能”，在句中作状语。三、must 的用法1、表示“必须”，多强调说话人的主观看法。2、must 和 have to 的区别：(1) must表示说话人的义务或说话人主观认为"必须，应当”做某事；have to表示由于某种外界原因

5、而“必须，不得不”做某事。即 must侧重说明主观看法，have to强调客观需要。(2) must只有一种形式，可用于现在、过去或将来时，但 have to有不同的形式，可用于不同的 时态。(3)在否定句中，don ' t need to, don ' t have to, needn ' t 表示没有义务；mustn ' t 表示禁 止。3、must的否定形式must not/mustn ' t意为"不许，禁止”，表示绝对禁止。若表示"没必要， 不必”,应使用 needn ' t 或 don ' t have to

6、。注意：对 must作否定回答时，不用 mustn ' t,用needn ' t或don ' t have to。4、must表示“偏偏”，指令人不快的事情。5、must用来表示推测，意为i "准是，肯定是"，一般用于肯定句，肯定程度比may,might大的多。四、need的用法1、need用作情态动词，后面接动词原形，通常用在否定句和疑问句中。2、回答need时，肯定回答用 must,否定回答用needn ' t或don ' t have to。3、need用作实义动词时，有时态、人称和数的变化，后面加 to do。4、need t

7、o do 和 need doingneed to do 中不定式的逻辑主语就是主句的主语；need doing 是主动形式表示被动含义，即 need前的主语就是need后面的动词所表示的动作的承受者。注意：want和require作"需要”讲时，和 need的用法相同。5、needn ' t have done 与 didn ' t need to doneedn ' t have done 表示过去本不必做但实际上却做了某事didn ' t need to do表示过去不必做而实际上也没做某事五、dare的用法1、dare用作情态动词，后面接动词原形

8、，通常用在否定句和疑问句和条件句中；它没有人称和数的变化，但有过去式(dared )。2、dare用作实义动词时，有时态、人称和数的变化，后面加 to do。注意：(1) I dare say意为"我认为，我相信，很可能”。(2) dare用作实义动词时，表示“敢冒(危险)，不俱”。(3) dare 可用于激将或挑战。例： He dared me to jump down.六、will 和 would1、will的用法(1)可以表示主观意志、意愿，可用于各种人称。(2)可以表示经常性、习惯性、倾向性等，意为“经常，惯于，总是”。(3)表示命令(说话这确信命令一定会得到执行)或允诺。(

9、4) will可用于祈使句的附加疑问句。(5)用于疑问句，表“邀请，请求”，常与第二人称you连用。2、would的用法(1)作为will的过去时态，用于过去时中，表示主观愿望或意志，意为“愿意，执意”。(2)用与第二人称，表示谦恭的请求或征求意见，比will更为客气(3)表示过去的习惯，后接动词原形，意为“总是，总会”(4) would表意愿用于词组中。Would like"喜欢，想要"(=would love )Would rather"宁愿"。七、shall 和 should1、shall的用法(1) shall用于第一、三人称陈述句中，表示说话人

10、征求对方的意见或向对方请示。(2) shall用于第二、第三人称陈述句中，表示说话人给对方的命令、警告、允诺或威胁。(3)用于所有人称，表示规章、法令、预言等，可译为“必须”。2、should 的用法(1)表示义务、责任或劝告、建议、命令等，意为“应该”。(2)表示有一定根据的推测、推论或可能性，意为“可能，该”(肯定的语气没有must表推测时强)。(3)多用于疑问句中，表示惊讶、难以相信或不应该的事。(4) ought to 和 should 的比较A、ought to 也可以表示推论、可能性，和 should用法一样。B、在省略回答中，oughtto 中的to可以省略。C、should和o

11、ught to 表示做正确的事情或理应做的事情be supposed to 意为“被期望，应该”，表示被期望发生或根据安排、要求做某事，或认为做某事是正常的。八、had better意为“最好"，'d better为其缩写形式，其后续跟动词原形。注意：had better 的否定形式为 had better not 。九、used to“过去常常”仅用于过去时态中，通常用于所有人称。1、used to +动词原形，表示过去(有规律的)习惯或过去某一时期的的状况，但现在已不存在。2、其反意疑问句简略回答中，也有两种形式：didn ' t , use (d) n'

12、 t3、used to 和 would 的区别(1) used to可表示过去经常发生的动作或存在的状态，而would仅表示过去习惯性或重复性的动作。(2) used to 强调过去的行为同现在的对比，含有“过去如此，现在已不再这样了”之意。 Would 仅表示过去习惯性动作，没有预先在对比的含义。(3) used to不能跟表确定时间短的时间状语连用。(4) used to 可用于无人称句和存在句，而 would则不可4、used to 与 be used to do 和 be used to doing(1) used to表示“过去常常”隐含现在不这样了，其中 to是不定式符号，后跟动词

13、原形，仅用于 过去时态。(2) be/get/become used to 表示"习惯于"时，意为"变得习惯于"或"开始习惯于”。(3) be used to do 表示"被用来”。十、情态动词后的某些动词形式1、情态动词+have done(1) “ must+have+done ”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯 定句。(2) "can't+have+done ”表示对过去事情的否定推测，译成"不可能做过某事”。(3) "can+have+done ”表示对过去行

14、为的怀疑，用于疑问句，译成"可能做过吗？"(4) “could+have+done ”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有 做。(5) “may+have+done ”表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用 于肯定句中。(6) "might+have+done ”表示对过去事情的推测，might与may意思相同，多用于虚拟语气结构中；还可以表示“本来可能”。(7) "would+have+done ”虚拟语气，表示对过去事情的假设，意思是"本来会做”。“ a shouldn't + hav

15、e+done(8) "should+have+done"意思是"本来应该做某事，而实际没做。，表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。(9) "ought to+have+done "表示过去应该做而实际并没有做，译成"理应做遗憾。与"should+have+done ”用法基本一样。(10) "need+have+done ”表示本来需要做某事而没有做。needn't+have+done”则表示“本来不需要做某事而做了”。2、情态动词+be doing :表示对现在正在做的事情的推测。

16、卜一、含有某些情态动词的反意疑问句1、 must当must表示命令时，反意疑问句用 needn ' t。当must表示推测时，反意疑问句与实际情况保持一致，即与把must删掉后的陈述句的反意疑问句保持一致。2、cant表示没能力做某事时，反意疑问句用 can sb.?t用于表推测时，反意疑问句由实际情况决定，即由去掉can ' t后的真实陈述句决定。十二、情态动词专项练习(附答案)1.Jean() have kept his promise. I wonder why he changed his idea.A. must B. should C. need D. would解

17、析：选B. "should have +过去分词" 表示"过去本来应该（但没能）做某事”；keep one ' s promise 意为 "信守诺言"2. Jane () have come to the party, but she () not find the exact time.A. could; could B. might; couldC. should; could D. should; would解析：选A. " could have+过去分词表示过去本来应该（但没能）做某事”3. So many mista

18、kes in your homework! You() more careful.A. may be B. had to C. would be D. should have been解析：选D. "You should have been more careful ".意为：你本来应该更细心的4. . Her brother () be at home now, because he was seen playing basketball in the stadium just now.A. mustn ' t B. needn ' t C. can &#

19、39; t D. shouldn't解析：选C. can ' t be at home 意为：不可能在家。5. . -I can t understand why our boss is late.-He ( ) the early bus.A. could miss B. may have missedC. can have missed D. might misscan解析：选B. "may have+过去分词”表示对过去动作的判断，意为：可能做了某事。 注意: 表示可能时，只能用于疑问句和反问句。6. She didn't answer the phon

20、e, she asleep.A. may be B. must be C. should have been D. must have been解析：选D.表示：对过去发生的事情的肯定推测。7. The little girl ' s eyes were red. She.A. may cry B. must cry C. must be cried D. must have been crying解析：选D.意为：她刚才肯定一直在哭。对过去某事正发生的推测。8. . He his supper now, for the dining hall is still closed.A. c

21、an ' t be having B. needn ' t be havingC. mustn ' t be having D. shouldn't be having解析：选A.对现在正在发生的事情的否定推测。9 . I parked my bike behind the building, but now it is gone. It.A. may be stolen B. must be stolenC. must have been stolen D. must have stolen解析：选C.对过去发生的事情 的肯定推测的被动式。10. Mr. Bl

22、ack go to work by ferry before the bridge was built?A. Did; used to B. Use; to C. Did; use to D. Does; use to解析：选C. used to do 的疑问式，可以是 Used+主语+to do ?或Did +主语+use to do?11. The hotel is only a stone ' s throw away, you take a bus.A. need not to B. not need to C. don't need D. need not解析：选D.

23、说话人认为不必要乘车，need为情态动词。12. I am busy now,my brother do it for you ?A. Will B. Shall C. Must D. May解析：选B.在疑问句中shall用于第三人称，也表示征求意见。13. -You needn ' t do it right now, need you?-Yes I am afraid I.A. need B. needn ' t C. must D. mustn ' t解析：选C. Yes的意思是：不。意为：恐怕我必须现在就做。14. My English-Chinese dic

24、tionary has disappeared . Who have taken it?A. should B. must C. could D. would解析：选C. could/can have done用于否定推测和疑问推测。15. -The room is so dirty.we clean it?-Of course.A . W川 B. Shall C. Would D. Do解析：选B. shall用在疑问句中，常用于第一，三人称，表示征求意见或请求指示。16. If you have something important to do, you waste any time.A

25、. needn ' t B. mustn ' t C. may not D. won ' t解析：选B.根据句意用mustn ' t17. If you want to borrow a football after school, your student card here.A. has to leave B. must leave C. has to be left D. must be left解析：选C. have to 表示客观需要，must表示主观需要。学生证必须放在此是客观需要。18. “ Did you scold him for his ca

26、relessness? "“Yes, but it ”A. I' d rather not do B. I ' d rather not have doneC. I shouldn ' t do D. I ' d better not do解析：选B. would rather加完成时表示对完成了的或过去了的事情的态度。意为：当时是不情愿做的。19. " Don' t get near to it . It is too dangerous! ”A. Yes, I won ' t B. No, I don ' t C.

27、 No, I can ' t D. No, I won ' t解析：选D. A为错误的表达方式；B和C没有直接回答对方的问候。20. He must be in the classroom,he?A. mustn ' t B. can ' t C. isn ' t D.can解析：选C.对表否定的must进行反意疑问时，要用句子的实义动词21. He be in the garden. He must be in the room.A. can ' t B. mustn ' t C. will not D. may not解析：选A.否定

28、推测用can ' t不用mustn ' t22. “Do you have to leave now? "“I am very sorry, but I really.”A. can ' t B. have C. should D. must解析：选D.回答have to的疑问句用must作肯定回答。23. "Let' s go to the library, shall we? ”"?A. No, I can ' t B. Yes, I willC. Yes , thank you D. No, we ' d be

29、tter not解析：选D. A,B,C都不能回答shall we,此处D的语气比较婉转客气24. Can I take it away?“You better not.”A. should B. could C. would D. had解析：选D. had better 与不带to的不定式构成谓语，可以变成疑问句：Hadn ' t you better-25. You have brought your camera. They all had theirs with them.A. couldn ' t B. needn ' t C. wouldn ' t

30、 D. mustn ' t解析：选B.本来不必要做某事.26. See who is there!it be May?A. May B. Must C. Can D. Will解析：选C.表推测时A, B都用作疑问句。27. John be a basketball player. He is much too short.A. may B. mustn ' t C. can ' t D. should解析：选C.断然的不定推测用can' t28. The Chinese teacher looks so pale. She be ill.A. must B.

31、mustn ' t C. can D. need解析：选A.表示有把握的肯定推测用 must29. Something to save our earth. Do you think so?A. can do B. must do C. has to do D. must be done解析：选D. "something must be done ” 意为：必须采取措施。30. Look at what you have done! You be more careful.A. ought B. can C. would D. should解析：选D. ought后应用to3

32、1. Has Li Lin started? He said he would join in the party.He. He is a man of keeping his word.A. could have left B. must have leftC. can ' t come D. won ' t be coming解析：Bo从He is a man of keeping his word中可以看出，李林肯定已经出发来参加聚会了，这是对已经发生的事情非常肯定的推测，故用 must have done 。注意must表推测时，不能用于否定 句和疑问句中。32. Ma

33、y I park my car here?No, you. No car is allowed to park here.A. may not B. needn ' t C. mustn ' t D. daren ' t解析：Co此题考查以情态动词提问的一般疑问句的回答。在英语中，以某些情态动词提问的句子， 出于礼貌委婉或句意的需 要，回答时，要换用另一个情态动词。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 ；在回答may开头的一般疑问句时,肯定回答用may ,否定回答用must

34、n ' t；在回答need开头的一般疑问句时，肯定回答用must否定回答用needn ' t。33. Excuse me, could you tell me where the Yajia Supermarket is?It' s two blocks straight ahead. You miss it.A. mustn ' t B. can ' t C. needn ' t D. shouldn ' t解析：B。根据题意，此处需要表示“推测”的否定结构，故 can' t为正确答案。4. A。这是一个省 略句，couldn

35、' t have done 表示对过去发生的动作的否定推测，意为"不可能”。34. I saw Mr. Sun at Tongyu Station this morning.You. He' s still on holiday in Hawaii.A. couldn ' t have B. mustn ' t haveC. shouldn ' t D. needn ' t解析：Ao这是一个省略句，couldn ' t have done表示对过去发生的动作的否定推测，意为"不可35. How about paying

36、 a visit to Dr. Wang, our former Chinese teacher?Good idea. I will e-mail him today so that he know to expect us.A. shall; why B. could; when C. would; what D. will; how解析：Bo这是一个综合题。本题 so that后的目的状语从句中的谓语动词要用"情态动词( may / might / can / could ) +动词原形"。When to expect us 表示“我们什么时候可到达"。&qu

37、ot;疑 问词+不定式”结本在句中作 know的宾语。36. Everything has two sides. Beautiful songs, sometimes,be just noise to others.A. must B. may C. should D. could解析：Bo由sometimes可知，此处应用表示可能性不大的情态动词，即 may。37. Someone my umbrella. I found it wet yesterday.A. must be using B. must have usedC. must use D. must have been usin

38、g解析：Bo由后句可知，这是对过去发生的事情的肯定推测，故 B项正确。38. How dangerous it was!Yes, but for the passer-by ' s quick action, the girl.A. was drowned B. could have been drownedC. had drowned D. should be drowned解析：Bo but for的意思是“要不是”，语法功能上等同于if引导的否定虚拟条件句，因前句中How dangerous it was可知应与过去事实相反。39. You scold such a pupil

39、who always keeps silent so seriously that you hurt him.A. should; can B. may; willC. mustn ' t; may D. can ' t; must解析：Co mustn ' t表示"不准许"，may表示可能性，所以 C正确。40. Why does Alice know so much about Angkor Wat?She have been there, or .A. must B. oughtn ' t to C. may D. can '

40、t解析：Co句意：她或许到过那里，或者。or .是重要的信息，说明还有其他的可能性。A的说法太绝对，与or .提供的信息冲突。41. You may laugh, but I ' ve been thinking of becoming a vegetarian.Oh, yoube crazy. You will be hungry all the time.A. must B. may C. will D. need解析：Ao must表示的把握最大，may表示有可能，need不表示推测，will表示将来。根据句意可 知A正确，表明对对方的不理解和责备，语气比较坚决。42. What

41、 ' s the matter with you?Oh, I ' m not feeling well in the stomach. I so much fried fish just now.A. shouldn ' t eat B. mustn ' t have eatenC. shouldn ' t have eaten D. mustn ' t eat43. he have been chosen as captain of the football team?Yes, he.A. Can; must have B. Must; mus

42、t haveC. Can; must D. Must; must解析：Ao疑问句中可以用can,肯定句用must。44. Mr. Zhang in Shanghai tomorrow morning.A. can have arrived B. will have arrivedC. may have arrived D. must have arrived解析：Bo will + have done ,表示对将来必然进程的猜测。45. Miss Wang started at 8 o ' clock, and she be there now.A. should B. can C.

43、can ' t D. need解析：Ao should 表示主观性猜测，译为“应该”。46. It must be Mr. Li who did it.No, it be Mr. Li.A. mustn ' t B. wouldn ' t C. can ' t D. may解析：C, can' t表示否定的猜测，侧重于主观判断，译为“决不会；不可能”47. You finish reading the book as soon as possible.A. may B. can C. need D. should解析：D。should表示劝告某人应该做某

44、事。48. Need you go to work now?Yes, I.A. must B. need C. can D. dare解析：Ao need引导的一般疑问句，肯定回答应用must。49. Your trousers are dirty.them for you?A. Shall I wash B. W川 I washC. Am I going to wash D. Am I washing解析：Ao Shall I . ?是征求对方意见时常用的句型。50. You are late for school today. You to school earlier.A. ought

45、to come B. should have comeC. ought have come D. should come解析：Bo should have done 表示"过去某件事应该做而实际上没有做”，此处含有责备之意，也 可用 ought to have come 。51. We must learn from Lei Feng,we?A. may B. can ' t C. don ' t D. needn ' t解析：D。反意疑问句中，当 must作"必须”解时，可以用needn ' t / mustn ' t构成附加疑问句

46、。52. She must be hungry,she?A. isn ' t B. needn ' t C. doesn ' t D won ' t解析：Ao反意疑问句中，陈述部分的must表示对现在情况推测时，附加疑问句中通常依据must后面的动词形式确定助动词。53. He ought to come here early,he?A. would B. should C. didn ' t D. shouldn ' t解析：D。反意疑问句中，陈述部分的谓语有ought to 时，附加疑问句中应用shouldn 't或oughtn to

47、54. You used to smoke,you?A. used to B. don ' t C. didn ' t D. shouldn ' t解析：Co反意疑问句中，陈述部分的谓语有used to 时，附加疑问句中应用 didn ' t或usedn ' t。55. You ought for what you haven ' t done.A. not to be punished B. not be punishedC. to not punished D. to not be punished解析：Ao ought to的否定式是 ou

48、ght not to56. you please tell me the way to the post office?A. Must B. Need C. Would D. Should解析：Co Would you please .?是向对方提出请求或询问时常用的婉转而有礼貌的句型。27. A主语是第三人称时，shall表示说话人给对方的“允诺；命令；指示；意愿”。57. I' m sure he have the computer sooner or later.A. shall B. can C. must D. would解析：Co Would you please .?是向

49、对方提出请求或询问时常用的婉转而有礼貌的句型。58. It is important that we learn how to drive.A. have to B. should C. need D. shall解析：B。在 It is important / impossible / necessary that .句型中，that 从句的谓语用"(should + )动词原形"。59. It has been announced that candidates remain in their seats until all the papershave been co

50、llected.A. can B. will C. may D. shall解析：D。在规章中告诫应考者，在收完所有试卷前“必须”留在教室里。60. How you say that you really understand the whole story if you have covered onlya part of the article?A. can B. must C. need D. may解析：Ao can在疑问句中，表示疑惑、怀疑，根据情况可译作“能、可以”等。61. I didn ' t see her in the meeting room this morni

51、ng. She at the meeting.A. mustn ' t have spoken B. shouldn' t have spokenC. needn ' t have spoken D. couldn' t have spoken解析：D. must表示推测时不用于否定句；shouldn ' t have done sth. 表示"本不应该做某事而实 际上做了"； needn ' t have done sth. 表示“本来不必做某事而实际上做了" ； couldn ' t have done

52、sth.表示“不可能做过某事”。根据题意，选 D。62. One ought for what one hasn ' t done.A. not to be punished B. to not be punishedC. to not punished D. not be punished解析：A.情态动词ought 后要接带to的不定式，ought to do 的否定式是ought not to do ,所 以答案是Ao63. If you really want yourself to be in good health, you must always so much.A. n

53、ot; be smoking B. not; have smokedC. not; to smoke D. be not; smoking解析：A. must not always be doing sth. 表示“不要老是做谋事"，含有埋怨、指责、反感等感情 色彩。64. With so much work on hand, you to see the game last night.A. mustn t go B. shouldn t goC. couldn ' t have gone D. shouldn ' t have gone解析：D.题中的A项和B项都

54、指现在情况；couldn ' t have gone 表示“不可能去过"；shouldn t have gone 表示"本不应该去而实际上去了”。根据题意，选 D。65. Most of the students felt rather disappointed at the English party. They say that it better organized.A. had been B. had to be C. must have been D. could have been解析：D. could have done sth. 表示"本来

55、能够做某事而实际上未能做成”。66. I' m surprised that he in the exam.A. should fail B. would have failedC. may have failed D. should have failed解析：D. should可用于表示惊奇、感叹、不满等感情色彩的句子，如指过去的动作，则要用 should have done sth. Would 和 may通常不带感情色彩。67. The little girl there alone.A. not dare go B. dares not go C. dare not go D

56、. dare not to go解析：C.题中的dare是情态动词，后接不带to的不定式，主要用于疑问句、否定句和条件句中。68. “Must we do it now? ”"No, you.”A. won ' t B. needn ' t C. can ' t D. don ' t解析：B. must开头的疑问句，否定答语用needn ' t或don ' t have to69. He said he would rather not it right now.A. doing B. to do C. do D. to be doin

57、g解析：C. would rather通常也视为情态动词（组），后接动词原形，其否定形式为 would rather not 。70. You to the meeting this afternoon if you have something important to do.A. needn ' t to come B. don ' t need comeC. don ' t need coming D. needn ' t come解析：D. need作为情态动词，其否定形式为needn 't；作实义动词时，其否定形式为don 't （do

58、esn ' t） need to do 。71. Put on more clothes. You be feeling cold with only a shirt on.A. can B. could C. would D. must解析：D. must用在肯定句中表推测时，语气比 could, would等肯定得多。此处"must + 不定式进行式”表“想必正在”之意。72. I play football than baseball.A. would rather B. had better C. like better D. prefer解析：A. would ra

59、ther than，意为"宁愿（做）而不（做）”。73. I thought you like something to read, so I have brought you some books.A. may B. might C. could D. must解析：B.由句意可知，这是对过去发生的事情不太有把握的推测。t have hurried74. There was plenty of times. Shet have hurriedA. mustn t have hurried B. couldnC. must not hurry D. needn解析：D. needn

60、' t have done 意为"过去不必做而做了某事"。75. The plant is dead. Iit more water.A. will give B. would have givenC. must give D. should have given76. You解析：D. should have done 表示"过去应该做而没有做某事”。return the book now. You can keep it till next week if you like.A. can ' t B. mustn ' t C. needn ' t D. may not均不合题意。解析：C. can ' t （不能），mustn ' t （不准），may not （不可以），77. It ' s still early, youA. mustn ' t hurry B. would