另外，表示“别忘了……,”“总之.”“毕竟”,这时的after all一般故在句首,用来提醒对方(听话的人)似乎忘记了一个重要事实,忽略了某个重要的'理由或论点。如：
①Why is he not allowed to stay here?After all,It's his home.
②After all,she is a child.毕竟，她是个孩子。
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