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情态动词+ have +过去分词用法特别重要，现总结如下：
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.
【have 加过去分词是什么时态 have的过去分词怎么写】Philip can (could) have been hurt seriously in the car accident.
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.

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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.

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