英语 助动词和情态动词（句子应用与解析）
1. －Can you speak Japanese?
－No, I ____.
A. mustn"t B. can"t
C. needn"t D. may not
解析：B. 考查情态动词的用法。can表示能力。
2. Even the top students in our class can"t work out this problem, so it
____ be very dififcult.
A. may B. must
C. can D. need
解析：B. must在这里表示肯定推测，意为“想必、一定”。
3. －Must I write all the words down now?
－No, you ____.
A. mustn"t B. can"t
C. won"t D. don"t need to
解析：D. 回答含有must的问句时,用don"t need to表示“不需要、没必要”。
4. You ____ go and look for her. She"ll be here in a few minutes.
A. can"t B. mustn"t
C. needn"t
解析：C. 考查三个情态动词否定式的用法。只有needn"t表示“不必”的意思。
5. This key ____ be Peter"s. His is still in the lock.
A. may not B. can"t
C. mustn"t D. needn"t
解析：B. 当要表示对现在事情的否定推测时，用can"t表示“一定不”。
6. It"s cold outside. You"d better ____ your coat.
A. not to take off B. not take off
C. to not take off D. don"t take off
解析：B. had better后跟原形动词，如果是否定式，not要加在had better和原形动词中间。
7. －____ I come in, Mr. Green?
－Yes, come in, please.
A. Must B. May
C. Will D. Need
解析：B. may在此表示请求，译为“可以”。
8. －____ I take the newspaper away?
－No, you may not. You ____ read it here.
A. Must; can B. May; can
C. Need; must D. Must; must
解析：B may在此征求对方意见，can表示“可以”。
9. －Must we do some cleaning now?
－No, you ____. You ____ go home.
A. mustn"t; may B. mustn"t; must
C. needn"t; may D. can"t; can
解析：C. mustn"t表示“禁止”，can"t表示“不能”，只有needn"t用于该题合乎要求，表示“不必”的意思。may表示“允许”。
10. You"d better ____ at home on Sundays.
A. stay B. to stay
C. stayed D. staying
解析：A. 考查had better之后跟原形动词的用法。
11. You"d better ____ upstairs and tell the children ____ make so much
noise.
A. go; not to B. go; don"t
C. to go; not to D. to go; don"t
解析：A. 考查had better之后动词的形式以及动词不定式的否定形式。
12. －I feel a bit worried.
－No, you ____. Nothing serious.
A. haven"t B. needn"t
C. can"t D. may not
解析：B. needn"t表示“不必”的意思。Nothing serious是There is nothing serious的省略。
13. －Take care of yourself.
－Thank you. I ____.
A. will B. shall
C. am going D. think
解析：A. will表示意愿，I will等于I will take care of myself.
14. －Is this your pencil-box?
－____.
A. Yes, it is B. Not, it isn"t
C. Yes, it does D. No, it doesn"t
解析：A. 在回答主语是this,动词是be的一般疑问句时，答句要用it is而不能用其他助动词。
【感谢阅读，希望对你有帮助~】