while和when什么情况下可以互换

问题描述:

while和when什么情况下可以互换

while在大多数情况下用进行时,when一般用过去时,这只是一般情况,有时可以随便
当从句的谓语是表动作的延续性动词时,when, while才有可能互相替代.如:
While / When we were still laughing, the teacher came in.正当我们仍在大声嬉笑时,老师进来了.