类型:英语语法
时间:2022-09-01
点击量364
1)must + have done:用于肯定句,表示推测:意为“一定(已经)……”。
You must have
finished the work. 你一定已经完成工作了。
2)can + have done:用于否定句或疑问句,表示推测,意为“可能(已经)……”。
He can’t have left so soon. 他不可能走得这么早。
3)
could + have done:可用于肯定句、否定句或疑问句,表示推测、责备或遗憾等,意为“可能……”、“本来可以……”、“本来应该……”等。
You could have finished it, but you
failed. 你本可以完成,但你失败了。
4)
should [
ought to] + have done:可用于肯定句、否定句或疑问句,表示责备或遗憾等,意为“本来应该……”。
You should have
helped me, but you just sat and
watched there.
你本应该帮我的,但你只是在那坐着看。
5)need + have done:用于否定句或疑问句,用于否定时意为“本来不必”,用于疑问句时意为“有必要……吗”。
You needn’t have helped me
because I could make it.
你本没必要帮我的,我自己可以做到。
6)may + have done:用于肯定句或否定句,表示推测,意为“可能(已经)……”。
She may have seen this film. 她可能已经看过这部电影了。
7)
might + have done:用于肯定句或否定句,表示推测,意为“可能(已经)……(此时might可换为 may);
She may/ might have seen this film. 她可能已经看过这部电影了。
另外还可以表示过去可能发生的事结果未发生,意为“本来会……”(此时 might不能换为 may)。
Tom might have
given you more help, even
though he was busy.
尽管汤姆很忙,他或许也会多给你一些帮助。
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