高中情态动词讲解及练习有答案
情态动词
情态动词表示说话人对某一动作或状态的态度，可以表示“可能”、“可以”、“需要”、“必须”或“应当”等之意。情态动词没有人称和数的变化。但不能单独作谓语动词用，必须和不带to 的不定式连用构成谓语动词。只有情态动词ought要和带to的动词不定式连用，在句中作谓语用。
一．can/ be able to
can 表客观的能力，be able to表通过主观的努力，能够……
eg. He is a native speaker of English, so he can speak English well.
The fire was big, but he was able to escape.
二．shall 用于二、三人称表命令，警告，威胁。宣布法律，法规时用shall.
eg. The judge declared that all the money shall belong to the wife.
—What does the sign over there read?
—“No person smoke or carry a lighted cigarette，cigar or pipe in this area.”
A.will
B.may
C.shall
D.must
三．1. should 表推测时指确定或期望，即合乎理想的情况或结果。
It’s nearly seven o’clock. Jack should be here at any moment.
2. should 表“竟然”
How should he do like this?
四. 情态动词表推测。
1. must may might 用于肯定句，语气减弱。
can’t couldn’t 意为“不可能”，用于否定句，疑问句。
不存在mustn’t have done
eg. He must be at home.
He may go out .
He can’t be watching Tv.
He couldn’t have finished the job yesterday, for he was badly ill.
2. could have done 本可以……（实际没有）
He could have been admitted to the college, but he failed.
五．1. may 表征求对方意见。
May I have a look at it ?
2．表推测时may 表不确定。
eg. The train might leave at six, but I’m not sure.
3. may /might as well 不妨……，不如……
eg. It is dark and you may as well stay here .
Since the flight was cancelled，you might as well go by train.
六．情态动词+ have done
1. should (not) have done
ought (not) to have done 本应该做某事。
eg. You should have come here earlier.
You oughtn’t to have eaten too much.
2. must have done 表示对过去已经发生的行为进行推测，意为“一定做了某事”
eg. It must have rained last night, for the road was quite muddy.
3.may / might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，或事实上根本没发生，译为“也许……”。如：
4. couldn’t have done / can’t have done表示对已发生情况的否定推测,“不可能做了某事”eg.Time was limited, so he couldn’t have finished the task.
Mary my letter; otherwise she would have replied before now.
[A] couldn’t have received[B] ought to have received
[C] has received [D] shouldn’t have received
5. needn’t have done “本没有必要做了某事”
eg. You needn’t have taken a taxi here, for it was near to your house.
needn’t do “没必要去做某事”
You needn’t go now.
As it turned out to be a small house party，we so formally.
[A] needn’t dress up [B]did not need have dressed up
[C] did not need dre ss up [D] needn’t have dressed up
七．can’t be too can’t never be too
eg. You cannot be too careful when you drive a car.
八．It couldn’t be better. / It couln’t be worse. (交际用语)
How do you find the restaurant?
It couldn’t be better. / It couln’t be worse.
1. I was really anxious about you. You ______home without a word.
A. mustn’t leave
B. shouldn’t have left
C. couldn’t have left
D. needn’t leave
2. ------Write to me when you get home. ----_________.
A. I must
B. I should
C. I will
D. I can
3. You can’t imagine that a well-behaved gentleman _____ be so rude to a lady.
A. might
B. need
C. should
D. would
4. 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
5. He heisitated for a moment before kicking the ball, otherwise he _____ a goal.
A. had scored
B. scored
C. would score
D. would have scored
6. ------I hear you’ve got a set of valuable Australian coins. _____ I have a look?
-----Yes, certainly.
A. Do
B. May
C. Will
D. Should
7. -----Is John coming by train?
-----He should, but he ______not. He likes driving his car.
A. must
B. can
C. need
D. may
8. It has been announced that candidates _____remain in their seats until all the papers have been collected.
A. can
B. will
C. may
D. shall
9. It is hard for me to imagine what I would be doing today if I _____in love at the age of seven, with the Melinda Cox Library in my hometown.
A. wouldn’t have fallen
B. had not fallen
C. should fall
D. were to fall
10. -----I heard they went skating in the mountains last winter.
-----It _____true because there was little snow there.
A. may not be
B. won’t be
C. couldn’t be
D. mustn’t be
11. Oh, I’m not fee ling well in the stomach. I _______so much fried chicken just now.
A. shouldn’t eat
B. mustn’t have eaten
C. shouldn’t have eaten
D. mustn’t eat
12. How I wish every family ______a large house with a beautiful garden!
A. has
B. had
C. will have
D. had had
13. Naturally, after I told her what to do, my daughter _____go and do the opposite!
A. may
B. can
C. must
D. should
14. ------The room is so dirty. _____we clean it ? ------ Of course.
A. will
B. Shall
C. Would
D. Do
15. A left-luggage office is a place where bags ______be left for a short time, especially at a railway station.
A. should
B. can
C. must
D. will
16. How ______you say that you really understand the whole story if you have covered only part of the article?
A. can
B. must
C. need
D. may
17. You might just as well tell the manufacturer that male customers _____not like the design of the furniture.
A. must
B. shall
C. may
D. need
18. ----Isn’t that Ann’s husband over there?
-----No, it ______be him----I’m sure he doesn’t wear glasses.
A. can’t
B. mustn’t
C. won’t
D. may not
19. -----Who is the girl standing over there?
-----Well, if you ______know, her name is mabel.
A. may
B. can C, must D. shall
20. Children under 12 years of age in that country ______be under adult supervision when in a public library.
A. must
B. may
C. can
D. need
21. “The interest _____be divide into five parts, according to the agreement made by both sides,”declared the judge.
A. may
B. should
C. must
D. shall
22. -----I’ll tell Mary about her new job tomorrow.
-----You______her last week.
A. ought to tell
B. would have told
C. must tell
D. should have told
23. I ______pay Tracy a visit, but I’m not sure whether I will have time this Sunday.
A. should
B. might
C. would
D. could
24. ----I don’t mind telling you what I know.
----You ______. I’m not asking you for it.
A. mustn’t
B. may not
C. can’t
D. needn’t
25. -----Excuse me, but I want to use your computer to type a report.
-----You ______have my computer if you don’t take care of it.
A. shan’t
B. might not
C. needn’t
D. shouldn’t
26. -----Excuse me. Is this the right way to the Summer Palace?
-----Sorry, I am not sure, but it ______be.
A. might
B. will
C. must
D. can
27. -----Mum, I’ve been studying English since 8 o’clock. _____ I go out and play with Tom for a while?
A. Can’t
B. Wouldn’t
C. May not
D. Won’t
28. I often see lights in that empty house. Do you think I _____report it to the police?
A. should
B. may
C. will
D. can
29. Mr.White ______at 8:30 for the meeting, but he didn’t show up.
A. should have arrived
B. should arrive
C. should have had arrived
D. should be arriving
30. You_____ be tired -----yo u’ve only been working for an hour.
A. must not
B. won’t
C. can’t
D. may not
31. I have lost one of my gloves. I _____it somewhere.
A. must drop
B. must have dropped
C. must be dropping
D. must have been dropped
32. Tom, you_____leave all your clothes on the floor like this!
A. wouldn’t
B. mustn’t
C. needn’t
D. may not
33. John, look at the time. _____you play the piano at such a late hour?
A. Must
B. Can
C. May
D. Need
34. He_____have completed his work; otherwise, he would n’t be enjoying himself by the seaside.
A. should
B. must
C. wouldn’t
D. can’t
35. I ______have been more than six years old when the accident happened.
A. shouldn’t
B. couldn’t
C. mustn’t
D. needn’t
36. There _____be any difficulty about passing the road test since you have practiced a lot in the driving school.
A. mustn’t
B. shan’t
C. shouldn’t
D. needn’t
37. I was on the highway when this car went past followed by a police car. They _____ at least 150 kilometers an hour.
A. should have been doing
B. must have been doing
C. could have done
D. would have done
38. ------I’ve taken someone else’s green sweater by mistake.
------It _____Harry’s. He always wears green.
A. has to be
B. will be mustn’t be D. could b e
39. ----Catherine, I have cleaned the room for you.
-----Thanks. You _______it. I could manage it myself.
A. needn’t do
B. needn’t have done
C. mustn’t do
D. shouldn’t have done
40. ----Lucy doesn’t lending you her dictionary.
-----She______. I’ve already borrowed one.
A. can’t
B. mustn’t
C. needn’t
D. shouldn’t
41. ----Do you know where David is ? I couldn’t find him anywhere.
-----Well. He _______have gone far ----his coat’s still here.
A. shouldn’t
B. mustn’t
C. can’t
D. wouldn’t
42. If I ______ plan to do anything I wanted to, I’d like to go to Tibet and travel through as much of it as possible.
A. would
B. could
C. had to
D. ought to
43. ------Shall I give you a ride as you live so far away ?
-----Thank you. _______.
A. It couldn’t be better
B. Of course you can
C. If you like
D. It’s up to you
44. -----Tom is never late for work. Why is he absent today?
-----Something _____ to him.
A. must happen
B. should have happened
C. could have happened
D. must have happened
45. The World Wide Web is sometimes jokingly called the World Wide Wait because it ____ be very slow.
A. should
B. must
C. will
D. can
46. Helen ____ go on the trip with us, but she isn’t quite sure yet.
A. shall
B. must
C. may
D. can
47. ------The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
----Oh, dear! She _____ a lot of difficulties!
A. may go through
B. might go through
C. ought to have gone through
D. must have gone through
48. He paid for a seat, when he _____ have entered free.
A. could
B. would
C. must
D. need
49. This cake is very sweet. You _____ a lot of sugar in it.
A. should put
B. could have put
C. might put
D. must have put
50. -----Never touch my computer while I’m away.
-----________.
A. I shouldn’t
B. I mustn’t
C. I won’t
D. I don’t
51. ----Why does Michael know so much about Angkor Watt?
----He _____ have been there , or….
A. must
B. oughtn’t to
C. may
D. can’t
52. ----We want someone to design the new art museum for us.
-----______the young fellow have a try?
A. May
B. Shall
C. Will
D. Need
53. ---Why hasn’t Jane arrived yet?
-----She _____ again in the morning.
A. shouldn’t have oversl ept
B. may have turned off the alarm clock
C. must have no one to call her
D. should have someone to wake her up
54. You _____ him so closely; you should have kept your distance.
A. shouldn’t follow
B. mustn’t follow
C. couldn’t have been following
D. shouldn’t have been following
55. As teachers we should concern ourselves with what is said, not with what we think_____.
A. ought to be said
B. must say
C. have to be said
D. need to say
56. It seems as if the sun _____ round the earth since it rises in the east and set in the west.
A. circles
B. is circling
C. has been circling
D. were circling
57. All the doctors in the hospital insisted that he ______badly wounded and that he _____ at once.
A. should be; be operated on
B. were; must be operated on
C. was; should be operated
D. was; be operated on
58. Some women _____ a good salary in a job instead of staying home, but they decided not to work for the sake of the family.
A. must make
B. should have made
C. would make
D. could have made
59. I advised that he ____ to the hospital at once, but he insisted that he _____quite then.
A. be sent; was feeling
B. was sent; felt
C. be sent; feel
D. should be sent; should feel
60. English is language that many young people around the world ______ not speak perfectly but ____ at least understand.
A. may; can
B. would; might
C. will; must
D. could; might
61. If you _______ wait over there for a minute, Mr.Smith, I’ll tell our manager you’ve arrived.
A. must
B. should
C. will
D. can
62. The bus driver insisted that he ______at a normal speed and therefore _____ for the child’s death.
A. drive; not answer
B. was driving; shouldn’t answer
C. should drive; shouldn’t have answered
D. drove; shouldn’t answer
63. ______for the doctor’s careful treatment, he _____till last year.
A. If it is not ; can’t live
B. Were it not; couldn’t live
C. Had it not been; couldn’t have lived
D. If they were not; couldn’t live
64. We_____for her because she never came.
A. needn’t wait
B. mustn’t have waited
C. shouldn’t have waited
D. can’t have waited
65. ----So you mean I have been too strict with you?
----Well, if I _____say so.
A. must
B. dare
C. need
D. may
66. I’m feeling much better now so you _____the doctor.
A. mustn’t
B. can’t
C. needn’t
D. shouldn’t
67. ----You must let us know when you’re in France.
----Yes, I _______.
A. will
B. must
C. have to
D. should
68. I’m rather surprised you haven’t reported him to your teac her. In my opinion, you ______this as soon as you found out he was cheating.
A. must have done
B. might have done
C. could have done
D. should have done
69. I lived with my sister this summer and didn’t have to pay rent. So I _____save most of my salary.
A. could
B. would
C. was able to
D. should
70. We _____last night, but we went to the concert instead.
A. must have studied
B. might study
C. should have studied
D. would study
71. It’s nearly seven o’clock. Jack _____be here at any mome nt.
A. shall
B. need
C. should
D.can
72. You_____ scold such a pupil who always keeps silent so seriously that you ______hurt him.
A. should; can
B. may; will
C. mustn’t; may
D. can’t; must
73. -------You may laugh, but I’ve been thinking of b ecoming a vegetarian.
-------Oh, you ____be out of your mind. You will be hungry all the time.
A. must
B. may
C. will
D. should
74. -----Tom came to work last Friday, but no one has seen him since.
-----_______he have had an accident?
A. Should
B. Must
C. Might
D. Could
75. It was really very dangerous; you_____him seriously.
A. might have injured
B. may have injured
C. must injure
D. need have injured
76. ----Mom’s gift? She _____have chosen a better one for me.
-----She_____be very happy to know it.
A. should; must
B. might; wouldn’t
C. couldn’t; must
D. mustn’t; can’t
77. ----_____he have been chosen as captain of the football team?
-----Yes,he________.
A. Can; must have
B. Must; must have
C. Can; must
D. Must ; must
78. You_____use my bike on condition that you give it back to me before I leave here.
A. should
B. must
C. ought to
D. shall
79. -----Look, John’s fallen asleep.
-----Oh, he _____too late last night.
A. might sit up
B. should have sat up
C. could sit up
D. must have sat up
80. Don’t be so anxious about that. Helen ____a note.
A. may leave
B. should leave
C. might have left
D. can have left
81. It would be impossible for him to leave hospital tomorrow if he _____first aid when the accident happened.
A. hadn’t been given
B. wasn’t be given
C. shouldn’t be given
D. wouldn’t be given
82. Last year’s SARS outbreak tells us that a sound public health system _____be built up and strengthened in our country.
A. should
B. can
C. will
D. may
83. Why didn’t you make me a telephone call yesterday? I _____ about it.
A. ought to tell
B. ought to have been told might have told D. might have been told
84. ------Mum, I climbed to get the Teddy Bear from the top of the shelf.
------My goodness! You ______ yourself. You ____do that next time.
A. must have hurt; mustn’t
B. should have hurt; can’t
C. may have hurt; mustn’t
D. might have hurt; won’t be able to
85. His failure in the experiment suggested that he _____his teac her’s proper instructions.
A. should not have followed
B. should not follow
C. mustn’t have followed
D. hadn’t followed
86. Thank you for giving me a hand. I _____in the experiment without your valuable help.
A. have failed
B. will fail
C. would have failed
D. must have failed
87. You can’t imagine that a top student ____have failed in the college entrance examination.
A. might
B. need
C. should
D. would
88. -----Mummy, I have broken my train.
-----I told you so. You ____ on it.
A. mustn’t have ridden
B. couldn’t ride
C. shouldn’t have ridden
D. needn’t ride
89. ----Could you tell me what happened last night?
----I can’t go into detail now because it ____ take too long.
A. would
B. should
C. might
D. could
90. Whatever your parents ____ you---there is real Santa Claus. And I should know, because I’ve seen him myself!
A. may tell
B. could tell
C. may have told
D. must have told
91. If I ever decided to quit, then nothing my parents or my coaches ____ say ____ change my mind. It’s my life, not theirs.
A. could; would
B. could; should
C. would; must
D. would; should
92. Often, when he _____something that ____ him, he wasted his time drawing some little pictures.
A. should be doing; gave
B. should have been doing; was given
C. should do; was given
D. should have been doing; had given
93. ------Why! I _____ get you on the phone.
------We _____basketball on the playground when you phoned.
A. didn’t; must be playing
B. couldn’t; must be playing
C. couldn’t; must have played
D. didn’t; must have been playing
94. Recently quite a lot of experts ____ that another law on wildlife protection ____ as soon as possible.
A. suggested; must be passed
B. have suggested; be passed
C. were suggesting; was passed
D. suggested; being passed
95. They must have been enjoying themselves there, otherwise they _____ so long.
A. can’t have stayed
B. wouldn’t have stayed
C. needn’t have stayed
D. couldn’t stay
96. ------There’s someone outside. Who ____ it be?
------It must be Mary. She promised to come over at 8:00.
A. must
B. can
C. shall
D. need
97. Lisa hasn’t lived here for a long time. She _____know many people.
A. needn’t
B. can’t
C. shouldn’t
D. didn’t
98. -----What’s the matter with the man hanging his head there?
------Well, if you _____know, he was caught stealing my bike.
A. must
B. may
C. can
D. shall
99. -----What’s the matter with Peter?
----He was seen crying when he was coming out of the teacher’s office. He ____ by the teacher.
A. may be scolded
B. should have been scolded
C. must be scolded
D. must have been scolded
100. According to the administration everyone ______ not leave without admit.
A. shall
B. must
C. should
D. can
Answer:
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26-30AAAAC 31-35BBABB 36-40CBDBC 41-45CBADD 46-50CDADC 51-55CBBDA 56-60DDDAA 61-65CDCCD 66-70CADCC
71-75CCADA 76-80CADDC 81-85AABCD
86-90CCCAC 91-95ABDBB 96-100BBADA
高中英语情态动词经典习题(含答案)
高中英语情态动词经典习题(含答案) 一、单项选择情态动词 1．-- Catherine, I have cleaned the room for you. ---Thanks. You _______ it. I could manage it myself. A．needn’t do B．shouldn’t have done C．mustn’t do D．needn’t have done 【答案】D 【解析】 【详解】 考查情态动词辨析。句意: ---凯瑟琳，我已经为你打扫了房间。 - - -谢谢。你本不必这么做的。我自己能行。A. needn’t do不必做某事；B. shouldn’t have done本不应该做某事； C. mustn’t do禁止做某事；D. needn’t have done本不必做某事。由“Thanks. I could manage it myself”可知，needn’t have done“ 本不必做某事，而实际上做了某事”符合句意。故选D 项。 2．Paul did a great job in the speech contest. He many times last week. A．need have practised B．might practise C．must have practised D．could practise 【答案】C 【解析】 【详解】 考查情态动词。句意：保罗在演讲比赛中表现得很好。他上星期一定练习了很多次。must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故C选项正确。 3．It is really cold and the ground is wet; it ________ have rained last night. A．might B．must C．can D．should 【答案】B 【解析】 【详解】 考查情态动词辨析。句意：天气很冷而且地面是湿的，昨晚一定下了雨。根据上文the ground is wet可知，“昨晚下了雨”是肯定的，故用must have done“必定做了……”表示对过去十分有把握的推测，故选B。 【点睛】 must have done用法辨析 must have done：表示对过去的肯定的逻辑推测，推定某件事情、动作或状态可能在过去发生过（存在过）。 He must have been a doctor, for he knows medicine so well. 他过去肯定是一位医生，他对医学如此了解。 Somebody must have stolen the ring. 肯定有人偷了这枚戒指. [该句所推断的偷窃动作发生在
情态动词练习题带答案
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高中情态动词语法练习题
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初中英语情态动词专项讲解
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情态动词讲解归纳集团公司文件内部编码：（TTT-UUTT-MMYB-URTTY-ITTLTY-
链接中考语法：情态动词一、情态动词的特点： 情态动词，又叫情态助动词。它们具有以下特点： ⑴它们必须与其他动词连用，即：情态动词＋动词原形，表示说话人对所述动作的看法，如需要、可能、意愿或怀疑等。 ⑵绝大多数情态动词没有人称和数的变化，即第三人称单数不加-s（以be和have开头的情态动词短语除外）。 ⑶在意义上，情态动词具有“多义性”。例如：can既可表示能力，又可表示可能、允许等意义。 二、部分情态动词的基本用法： 1.can的基本用法： ⑴表示体力或智力上的能力，即“能够，会”，可与beableto转换。例如：HecanspeakEnglish./HeisabletospeakEnglish. 他会讲英语。Canyouplaybasketball— No,I can’t.你会打篮球吗——我不会。 如果表示将来具备的能力，要用willbeableto。例如：IfIhaveagoodsleep,Iwillbeabletodotheproblem. 假如我睡个好觉，我就能做那道题目了。
⑵表示许可，主要用于口语，书面语一般用may。例如：Canwegohomenow,please— No,you can’t.我们可以现在就回家吗——不可以。Youcanonlysmokeinthisroom. 你只能在这间房间里抽烟。 You can’t keepthelibrarybooksformorethanamonth.图书馆的书借期不 可超过一个月。 ⑶表示“可能”，与may同义，但一般用在疑问句中。例如：Whatcanhepossiblywant他可能会想要什么呢另外，在否定句中，否定 形式can’t表示推测“不大可能”。例如：Anybodycanmakemistakes. 任何人都可能会犯错误。Thenews can’t betrue.那消息不大可能是真 的。 与第一、二人称连用时，还可以就可能的解决问题的方式或可能的行为 提出建议。在这里，也可用could使语气婉转。例如： Can/Couldwemeetagainnextweek下周我们可以再见面吗Whatshallwedo—Wecan/couldtryaskingLucyforhelp.我们怎么办呢—— 我们可以请露茜帮忙试试看。Youcan/couldhelpmewiththecooking.你可 以帮我做饭。 2.may的基本用法: ⑴表示“许可”，用can比较口语化。例如：Youmay/cancomeifyouwish. 如果你想来，你就来。Youmaynotpickflowersinthispark.
高考情态动词练习题题库
高考情态动词练习题题库 一、单项选择情态动词 1．You ________ give me a lift. I want to walk home for exercise. A．needn’t B．couldn’t C．can’t D．mustn’t 【答案】A 【解析】 【详解】 考查情态动词。句意：你不必让我搭车。我想步行回家锻炼身体。A. needn’t不必；B. couldn’t不能；C. can’t不会；D. mustn’t禁止，不允许。根据I want to walk home for exercise.可知，你不必让我搭车。故选A。 考点：考查情态动词 2．—It’s really great to have a computer to store my photos. —Don’t count on it too much. It ________ break down and you’d better make a copy of them. A．must B．can C．should D．will 【答案】B 【解析】 【详解】 考查情态动词。句意：——有一台计算机来储存照片真是太棒了。——不要过度依赖它。它有时候也会出故障，你最好做一个备份。计算机出故障这是可能的事情，表示客观可能性用can。must肯定，必须；should应该；will表意愿。故B选项正确。 3．— Mum, little Ray broke his toys again! —It doesn't matter. You see, accidents _____happen. A．shall B．should C．must D．will 【答案】D 【解析】 【详解】 考查情态动词辨析。句意：——妈妈，小雷又弄坏了他的玩具。——没事的，你看，意外总会发生。A. shall将要，会；B. should应当；C. must必须；D. will总是。Will可以表示习惯，意思为“惯于，总是”。故D选项正确。 【点睛】 will/would是情态动词，其表达的意思如下。 (1)表示意志或意愿：决心，愿意，……好吗? We will do our best to save the child. 我们会尽力抢救这个孩子。 I told her to stop crying, but she just wouldn’t list en. 我叫她别哭，可她就是不愿听。 注：表示请求、建议或征求对方意见时，用Would you…? 比用Will you…?更婉转。如：Will/Would you please keep the door open? 请让门开着好吗?
语法知识—情态动词的综合训练
一、选择题 1．— May I have some wine? — No, you . You have to drive home later. A．shouldn't B．needn't C．mustn't D．may not 2．(2018·山东临沂) Could you please speak a little louder? I ______ hear you very well. A．can’t B．mustn’t C．shouldn’t D．needn’t 3．I hope you __________ to my birthday party. A．to come B．can come C．comes D．are come 4．I’ve bought a nice necklace for Jo’s birthday. She _____like it, but I’m not sure. A．can B．may be C．might D．must 5．The designer has tried every possible way to make the robot light, so you _____ worry about its weight. A．must B．may C．can’t D．needn’t 6．—Is that Kate’s green bike? —It ____________be hers. She likes pink. A．can’t B．could C．mustn’t D．might 7．—Is that cap Bob’s? —No, it ________ be his. His is blue. A．can’t B．mustn’t C．needn’t D．may not 8．—Hi, Lucy, may I sit here? —No, ________. The seats are for teachers and parents. A．you needn't B．you aren't C．you mustn't D．you don't 9．The milk tastes bad. You’d better_______. A．throw it away B．to throw it away C．throw them away D．to throw them away 10．You run with the train when it is coming. It’s dangerous. A．may not B．mustn’t C．needn’t 11．We _______ keep the new traffic law and learn how to protect ourselves. A．may B．should C．can D．need 12．I’m sorry, children over 1.4 me ters________pay the full price for the show. A．may B．must C．can D．ought to 13．—Could you please hang out with me this afternoon? —______. I have to make a plan for Clean-Up Day. A．Sorry, I couldn’t B．Sorry, I can’t C．Sure, I can D．Sure, I could 14．Since the road is muddy,it ________last night, ________? A．must be rained; wasn’t it B．must have rained; didn’t it