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大学英语六级基础语法知识:情态动词

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zhaocongcong

2016年08月18日

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  在大学英语六级考试中,单独考察六级语法的题型不多,但是语法知识点却贯穿整张试卷,下面为大家整理大学英语六级基础语法知识:情态动词,希望可以为大家带来帮助。

  1、情态动词的完成式

  1)must have done——表示对过去的事情较有把握的、肯定性的推测,常译为“一定,准是,肯定”,其否定形式是can’t/couldn’thave done,意为“决不可能,不太可能”。

  e.g. Since the ditch is full of water, it must have rained last night.

  2)should/ought to have done——表示过去应该做的却没有做,常含有后悔、责备、埋怨的口吻,意为“本应该”,“应该就好了”; e.g. With all the work finished, I should have gone to your birthday party last night.

  3)shouldn’t/ought not to have done——表示过去不该做的事却给做了,也常含有责备、不满之意,意为“本不该”。

  e.g. You shouldn’t have gone back to work yesterday without the doctor’s permission.

  4)may/might have done——表示对过去的事情的推测,但不十分有把握,意为“可能,或许已经”。 e.g. A traffic accident happened yesterday and a driver may have been hurt.

  5)could have done——表示过去有可能或有能力做某事,而实际未做、未能实现的事;有时也表示轻度批评,意为“本来可以,完全可以”。 e.g. The gas leakage could have been avoided if the gas company took immediate measures after the warning call.

  6)needn’t have done——表示过去做了某事,但没有做的必要,意为“其实没有必要”。 e.g. I needn’t have bought all that wine——only three people came.

  2、可作情态动词用的短语

  would rather, would sooner, would (just) as soon, had rather, had better, had sooner, cannot but, may/might as well

  [例1]You________ all those calculations! We have a computer to do that sort of thing.

  A. needn’t have done B. must not have done

  C. shouldn’t have done D. can’t have done

  [例2]I ________to him because he phoned me shortly afterwards.

  A. ought to have written B. must have written

  C. couldn’t have written D. needn’t have written

  [例3]You________ those letters. Why didn’t you

  A. should post B. must have posted

  C. should have posted D. ought to post


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