【英语语法】when和while区别

①when意为"在……时;当……时",可表示"点时间"或"段时间",从句谓语可以是终止性动词,也可以是延续性动词。例如:
When I got home, he was having supper.
③while只可表示"段时间",从句谓语只限于延续性动词。例如:
While I was sleeping, my father came in.
注:从句谓语是持续性动词时,when、while和as可以互换?主?从句谓语都是终止性动词时,when与as可互换?从句谓语表示状态时,通常用while

when后面跟一般过去时，而while后跟过去进行时。