互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒高二英语中关于过去分词的用法是个重点难点，本文整理了情态动词 have 过去分词的用法，还没掌握这个知识点的同学不要错过了哦。
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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