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  • 英語六級情態動詞基礎語法知識

    時間:2024-06-21 12:09:05 英語六級 我要投稿
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    英語六級情態動詞基礎語法知識

      1、情態動詞的完成式

    英語六級情態動詞基礎語法知識

      1)must have done——表示對過去的事情較有把握

      的、肯定性的推測,常譯為“一定,準是,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——表示過去應該做的

      卻沒有做,常含有后悔、責備、埋怨的口吻,意為“本應該”,“應該就好了”; 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——表示對過去的事情的推

      測,但不十分有把握,意為“可能,或許已經”。 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,而實際未做、未能實現的事;有時也表示輕度批評,意為“本來可以,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“其實沒有必要”。 e.g. I needn’t have bought all that wine——only three people came.

      2、可作情態動詞用的短語

      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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