高校英语六级基本英语语法知识分享，在高校中，语法知识点却围绕一整张考卷，下边频道栏目为大伙儿梳理了基本英语语法知识，期待能够为大伙儿提供帮助，一起来学习培训一下吧。 基本英语语法知识：情态动词 have 过去分词
1) may(might) have done sth, can (could) have done sth表明以往，推断以往時间里很有可能产生的事儿。 Philip may (might) have been hurt seriously in the car accident. Philip can (could) have been hurt seriously in the car accident.
2)must have done sth，对以往時间里很有可能产生的事儿的推断，语调较强，具备"毫无疑问"，"谅必"的含意。 ---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 本应当做某件事，而实际上并沒有做。否定句表明"不应该做某件事而干了"。 You ought to (should) have been more careful in this experiment. He ought not to have thrown the old clothes away.(实际上已扔了。) ought to 在语调上比should 要好。
4) needn‘t have done sth 本没必要做某件事 I dressed very warmly for the trip, but Ineedn‘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.