might have done的用法

might have done的用法

may/might have done有两个意思：
1. 本来可以干......; 2. 推测过去所发生的事情。例如：
You come late again. You may/might have  get up early.你又迟到了，你本来可以早一点起床。
He may/might have stayed up  last night.昨晚他可能熬夜了。

may, might后接完成式的用法 ①表示对过去某事的推测，认为某一件事情在过去可能发生了。如果使用might，语气就比较婉转或更加不肯定，如：mary might have learned some chinese before. ②可以表示过去本来可以做到而实际没有做到的事情，有“劝告”或“责备”的语气，如：you didn't do the work well that day. you might have done it better. (3)must后接完成式的用法：表示对过去某事的推测，认为某事在过去一定做到 了，如：liu dong isn’t in the classroom. he must have gone to the library.