英语六级语法涉及广泛，备考时需重点掌握各种语法规则和结构，以下是“2024年12月英语六级语法必考语法知识讲解(39)”的归纳整理，希望对广大考生有所帮助。
2024年12月英语六级语法必考语法知识讲解(39)
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.
以上就是新东方在线小编为大家整理的“2024年12月英语六级语法必考语法知识讲解(39)”全部内容啦，预祝各位小伙伴顺利通过六级考试!