学英语最重要的就是培养语感，而语感不是死记硬背出来的，而是听出来的，说出来的。要想学好英语，就必须多听、多说。脸皮要厚一点，不要害怕因为说的不好而被人嘲笑。不敢开口才是真正值得嘲笑的。今天文都四六级为大家分享2020年上半年大学英语四级语法：情态动词+ have +过去分词，希望对您有所帮助。

大学英语四级语法：情态动词+ have +过去分词

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.

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.

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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2019年12月英语四级常用语法汇总

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