When I was watching TV,my brother did his homework.主句为什么用过去时,而 不用过去进行时?

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When I was watching TV,my brother did his homework.主句为什么用过去时,而 不用过去进行时?

应该
主句用过去时和过去进行时都可以
只是看句意,
强调什么.

when引导的句子,一般主句用进行时,从句用一般时.
这里用过去进行时是因为后面是did.要前后一致

这里要表达的意思是
我看电视的期间..我弟弟干了这件事
而不是我看电视的同时..弟弟在干某事
强调事情发生了而不是强调延续性..延续性就不用WHEN 要用WHILE

主句语法一般比较简单,而从句才好与之匹配.

根据意思来~
从句用了过去进行时~主句一般不重复~而要用过去式`

这句话的意思是: 当我正在看电视的时候,我弟弟做了家庭作业.
when引导的时间状语从句表示的是一个时间点,强调'特定时间'.

一个动作发生时，令一个动作正在进行。

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