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新概念英语新版新概念英语视频2018-06-24 06:09:25

情态动词+ have +过去分词

  1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情。

  Philip may (might) have been hurt seriously in the car accident.

  Philip can (could) have been hurt seriously in the car accident.

  

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2) must have +done sth,对过去时间里可能发生的事情的推测,语气较强,具有"肯定","谅必"的意思。

  —— Linda has gone to work, but her bicycle is still here.

  ——She must have gone by bus.

  3) ought to have done sth, should have done sth

  本应该做某事,而事实上并没有做。否定句表示"不该做某事而做了"。

  You ought to (should) have been more careful in this experiment.

  He ought not to have thrown the old clothes away.(事实上已扔了。)

  ought to 在语气上比should 要强。

  4) needn't have done sth 本没必要做某事

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

  5) would like to have done sth 本打算做某事

  I would like to have read the article, but I was very busy then.

七、should 和ought to

  should 和ought to 都为"应该"的意思,可用于各种人称。

  ——Ought he to go?

  ——Yes. I think he ought to.

  表示要求,命令时,语气由 should(应该)、had better最好)、must(必须)渐强。

  八、 had better表示"最好"

  had better 相当于一个助动词,它只有一种形式,它后面要跟动词原形。

  had better do sth

  had better not do sth

  It is pretty cold. You'd better put on my coat.

  She'd better not play with the dog.

  had better have done sth表示与事实相反的结果,意为"本来最好"。

  You had better have come earlier.

  九、 would rather表示"宁愿"

  would rather do

  would rather not do

  would rather… than… 宁愿……而不愿。

  还有would sooner, had rather, had sooner都表示"宁愿"、"宁可"的意思。

  If I have a choice, I had sooner not continue my studies at this school.

  I would rather stay here than go home. = I would stay here rather than go home.

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