小学英语语法知识：情态动词+ have +过去分词

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　　语法是学习英语的基础，在平常学习的时候就需要记住这些语法的用法，打好基础。以下就是小智为您整理的小学英语语法知识：should 和ought to，供同学们参考。如果想领取期中、期末等试题资料，您可以添加康康QQ号：493924147，即可免费领取资料哦。

小学英语语法知识：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.

　　以上就是小智为各位同学整理带来的小学英语语法知识：情态动词+ have +过去分词，同学们如有更多学业上的问题，拨打免费电话4000-121-121，那里有专业的老师为您解答。