in 5 minutes有连个意思。
一。表示在5分钟之后,表示将来的概念。如:he' ll come to see you in 5 minutes.
二。表示在5分钟之内。 yesterday i finished my work in 5 minutes.
after 5 minutes表示过去的概念,在过去某个时间的5分钟之后。
如:at first he said he would do it at once ,but after 5 minutes, he went out and forgot what he had said.
in 在5分钟内
after 是五分钟后
五分钟之内和五分钟之后