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英語(yǔ)六級(jí)

英語(yǔ)六級(jí)情態(tài)動(dòng)詞基礎(chǔ)語(yǔ)法知識(shí)

時(shí)間:2024-06-28 01:58:38 英語(yǔ)六級(jí) 我要投稿
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英語(yǔ)六級(jí)情態(tài)動(dòng)詞基礎(chǔ)語(yǔ)法知識(shí)

  1、情態(tài)動(dòng)詞的完成式

英語(yǔ)六級(jí)情態(tài)動(dòng)詞基礎(chǔ)語(yǔ)法知識(shí)

  1)must have done——表示對(duì)過去的事情較有把握

  的、肯定性的推測(cè),常譯為“一定,準(zhǔn)是,肯定”,其否定形式是can’t/couldn’thave done,意為“決不可能,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——表示過去應(yīng)該做的

  卻沒有做,常含有后悔、責(zé)備、埋怨的口吻,意為“本應(yīng)該”,“應(yīng)該就好了”; 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——表示過去不該

  做的事卻給做了,也常含有責(zé)備、不滿之意,意為“本不該”。

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

  4)may/might have done——表示對(duì)過去的事情的推

  測(cè),但不十分有把握,意為“可能,或許已經(jīng)”。 e.g. A traffic accident happened yesterday and a driver may have been hurt.

  5)could have done——表示過去有可能或有能力做某

  事,而實(shí)際未做、未能實(shí)現(xiàn)的事;有時(shí)也表示輕度批評(píng),意為“本來(lái)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——表示過去做了某事,但沒有做的必要,意為“其實(shí)沒有必要”。 e.g. I needn’t have bought all that wine——only three people came.

  2、可作情態(tài)動(dòng)詞用的短語(yǔ)

  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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