他看上去气色很好,他一定是度过了一个开心的假期。 must have enjoyed My coat is there.Someone
it by mistake. 我的外套不在那里,准是有人拿错了。 归纳总结 must have done意为:
,表示对过去事情的猜测,而且是很有把握的猜测。 (1)can’t/couldn’t have done“不可能……(对过去的事实作出很有把握的判断,用于否定句)” That can’t have been true.那不可能是真的。 could have done“可能(已经)……;本来可以……(但没有做)”(一是把握性不大的推测;二是与事实相反的建议) must have taken 过去一定做过某事 He could have overslept again.他(那时)可能又睡过头了。 (2)ought to/should have done“本来应该……(与事实相反);应该已经……”(较大把握的推断) You shouldn’t have laughed at his mistakes. 你本不该嘲笑他的错误。 He ought to have arrived by this time. 这时候他应该已经到了。 (3)may/might have done“可能已经……”(把握性不大的推测) He was absent from school.He may have been ill. 他没来上学,可能是病了。
(4)needn’t have done“本不必……”(本不该做的行为,却做了) We need not have been in a tearing hurry to catch the train. 我们本不该这么急匆匆地赶火车。 (5)would like to have done“本来想……”(表示过去没有实现的愿望) They would like to have seen that film last night. 他们昨晚本想去看那部电影的。 (6)would rather have done“宁可做过……”(后悔没做) I would rather not have seen that film. 我宁可没去看那部电影。
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