【高考英语语法】情态动词+动词完成式！今天开始学习情态动词+动词完成式，对情态动词不熟悉的学生看！

　　"情态动词+have done"是情态动词的一个十分重要的结构，昨天学习了may /might /have done的相关知识，今天学习下一个can/could have done。

　　B：can/could have done

　　1.表示对过去事实的推测，常用于否定句和疑问句。

　　He can't couldn't have watched TV yesterday for he knew they would have an exam.昨天他不可能看电视，因为他知道快要考试了。

　　I don't know why she didn't call me yesterday. Can (Could) she have forgotten my telephone number我不知道昨天她为什么没给我打电话，难道她会把我的电话号码忘了吗?

　　He didn't come to school yesterday. Can he have been ill他昨天没来学校，难道他生病了?

　　2.could可表示对过去能做而未做的事感到惋惜、遗憾，可译成"本来是可以……的"。

　　Why didn't Sophie apply for the job She could have got it.为什么索菲不申请这项工作?她本来是能得到的。

　　Why did you stay at a hotel when you went to New York You could have stayed with Barbara. 你到纽约时为什么住宾馆?你完全可以和芭芭拉住在一起的。

　　Given more time, we could have done the work better.如果给我们更多的时间，我们完全可以把这项工作干得更好。