在英语过去进行时中,when 和while 在用法上有什么区别?

问题补充：when 和while 同时都用于过去进行时时，有什么区别

When可接过去时和过去进行时，While只能接过去进行时

先弄清楚while和when的区别 when 当什么时 可表瞬间 事情可同时 或者先后发生 while 用于相伴发生的 同时进行的 持续性的 while 和 when在过去进行时中的用法：表示两个持续性的动作在过去同时发生用while，when后接一个短暂性的动作。持续性的动作用过去进行时,自然也就是要+ing了，短暂性的动作用一般过去时,所以不+ing. 所以是while后的动作+ing,when后的动作一般不+ing 1.i was doing my homework when someone knocked at the door. 2.we were walking along the river when suddenly it rained. 3.while he was waiting at the bus stop, the traffic accident happened.( while 后的分句必须用进行时) 4.while i was reading , my sister was sleeping.(表示对比,都用进行时)

若为“终止性”动词，则两个词可以互换;While I was studying there,I began to learn skiing. When(not While) his father died,不能用while eg分句谓语若为“延续性”动词,he was only 5 years old，则只能用when: When/