高考英语语法精要讲解二十六:情态动词
1、情态动词 + have done sth
这个结构有着特殊意义:用来表示猜测(设想可能发生过什么事情)或
想象(设想可能出现过什么不同的情况)
①should (ought to) have done sth 本来该做而未做
This wall oughtnt to have been painted blue.
②need have done sth 本来有必要做而未做
You neednt have told her the news.
③must have done sth 对过去所做动作的肯定推测
---We went to Paris.
---That must have been nice.
④can have done sth 对过去所做动作的否定或疑问推测
I dont think he can have heard you. Call again.
Where can John have put the matches?
⑤may (might) have done sth 过去可能发生某事,与could相比,may和 might可能性较小,might 可能性更小;might 也可表示过去可能发生而未发生的事情。
Pollys very late----she may (might) have missed her etrain.
You were stupid to try climbing there. You might have killed youself
⑥could have done sth
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