why did you come back so late today?it heavily when the meeting was over .I had to wait until it came to a stop 为什么?处要填was raining还有when与while的区别是什么?

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why did you come back so late today?it heavily when the meeting was over .I had to wait until it came to a stop 为什么?处要填was raining还有when与while的区别是什么?
why did you come back so late today?it heavily when the meeting was over .I had to wait until it came to a stop 为什么?处要填was raining还有when与while的区别是什么?

why did you come back so late today?it heavily when the meeting was over .I had to wait until it came to a stop 为什么?处要填was raining还有when与while的区别是什么?
当时在下雨,下雨已经是过去的事了,所以要用过去式was,在过去的那个时间点,当时是在下雨的,所以那时候的雨是过去的正在进行时.
when 和while 都有当...的时候的意思
when既可指时间点,也可指时间段
while只能指时间段
比如 ‘当早上5点到9点(时间段)’
while和when 都可以,
但是如果是 ‘当早上5点的时候(时间点)’,就只能用when

was raining是过去进行时,表示该动作在过去的某个时间正在发生。而when后可以用过去时和进行时;while后面只能跟进行时。所以该题用的是when.

情景发生在过去,When表示情景发生的时间,所以要用过去进行时,
when表示的当……时,时间段长
while表示两个动作时间几乎同时进行