after加时间段的时态

　　after几种用法：

　　一、after作介词的用法：

　　1、after+名词，作为介宾短语，

　　如：after 5 o'clock。五点以后。

　　He ran after the bus.他在那辆公交车后追着跑。

　　2、after+动名词，也是作为介宾短语，

　　如：after having finished my homework。完成我的作业后。

　　I will go to bed after drinking the milk.

　　3、after+代词，作为宾语的主语，

　　如：He went home after he finished all the work

　　二、after做副词的用法：

　　如：three hours after三小时后; He told me after that he had not enjoyed the film.他告诉我后来他一点都不想看电影。