谁能简单说说had been doing和have been doing的区别.最好举个例子.
问题描述:
谁能简单说说had been doing和have been doing的区别.最好举个例子.
现在完成进行时 过去完成进行时。区别在哪呀
答
是否有一个明确的时间点作对比,或者此时间点从上下文中可以推测出来.例如:1'I have been cleaning the room all the morning.2'I had been cleaning the room all the morning when she came.此处,when she come 就...