2018年大学英语B级语法之情态动词

发布于 2018-04-27 13:55  编辑:Ywen
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2018年大学英语B级语法之情态动词


情态动词用来表示能力、允许、许诺、可能、必须、劝告、意愿等概念或态度。情态动词无人称变化,在句子中和动词原形一起组成谓语。常用的情态动词有must,can,be able to,need,shall, should(ought to), could,would。

注意:mustn’t的意思是“禁止”,needn’t的意思是“无须,不必”。


大学英语B级考试.png


情态动词后接完成时的用法


  1. must+现在完成时结构:这一结构表示对过去一个动作比较有把握的猜测

:I believe he _______ an accident, otherwise he would have arrived on time.

A. would have had

C. should have had

B. could have had

D. must have had

答案为D

 

2. should (ought to )have done用来表示本来应该做却没有做的事情。

1:I'm sorry I couldn't get in touch with him before he left,____him earlier.

    A. had a telephone          B. have phoned

    C. should have phoned       D. should be phoned

 

答案是C

 

2: You ought_______the matter to the manager the day before yesterday.

A. to report

B. to have reported

C. to reporting

D. have reported

答案:B

 

3.could+现在完成时,表示本来能做的事情而没有做。

:Mary_____that coat, but she chose to lend the money to a needy neighbour.

A. could have bought    B. must have bought    C. can buy    D. could buy

答案为A.

 

4.needn't+现在完成时,表示本来不该做的事情却做了。

:I dressed very warmly for the trip, but I needn't have done so. The weather was hot.


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