这个句子为什么前面用过去时，后面用进行时she watched TV while she was washing her clothes. Thanks!

Question

这个句子为什么前面用过去时，后面用进行时she watched TV while she was washing her clothes. Thanks!
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问题补充：Mary watched TV while she ate her supper.
While John was sitting biting his nails, I was working out a plan to get us home.那为什么我有见过这样的两个句子，前后时态又和she watched TV while she was washing her clothes.不一样呢，谢谢！
she watched TV while she was washing her clothes.能否说成
she was watching TV while she was washing her clothes.

Answer 1

这个句子为什么前面用过去时，后面用进行时
she watched TV while she was washing her clothes.
while conj.引导一个时间状语从句，表她在洗衣服的过程中也在看电视。
你也可以说：She washed her clothes while she was watching TV.
因为主句和从句中的两个动作wash和watch都为延续性动词。再如：
He knocked the door while I was cooking.
说成：I cooked while he was knocking.就不太好了。
while conj.后一般应跟延续性动词。
when conj.后一般可跟延续性动词也可跟短暂性动词。
所以上句也可以用when替换while.

同时注意：while 引导的时间状语在表时间、伴随的基础上更侧重，两个动作的比较、对比。
如：While I was wathching,my sister is doing homework.
对比两个动作，上句强调我不应在学习时间看电视。

Answer 2

这很简单，因为while放的位置不同。当while放在句首的时候，从句前后都要用-ing形式，而当while放在句子中时，句子前部分是不用写成-ing形式的，只要把while后面的部分的动词写成-ing形式。while一般用于过去进行时，它表示的是两个动作在某一时间段同时进行，它可以等于when，但是唯一的区别是when表示的是一个动作正在进行时另一个动作在中途也进行了。

Answer 3

我的回答:前面用过去时的原因是因为这个事对现在来说已经过去,后面用正在进行时的原因是当时在看电视的同时也正在洗衣服.这句话的翻译:当她在洗衣时,她也在看电视.也就是说边洗衣服边看电视.

Answer 4

she watched TV while she was washing her clothes.
如果这里面的she代表同一个人，那么也可以说成
she watched TV while washing her clothes．中间相同的部分可以省略．
　　　　　　　引导状语从句
　　①while有时＝when ,翻译成　当～的时候；和～同时
my wife kept silent while I was writing.
　　②while=although，翻译成　　虽然；尽管
while (he was) respected,he was not liked.
　　③while同as long as, 翻译成 只要
There will be life while there is water and air.
④while同whereas（表示对比）＝but,翻译成 然而
He is a worker while I am a docter.
注意：while 从句动词须能延续
误：Somebody broke in while we went out.
正：Somebody broke in while we were out.本回答被网友采纳

Answer 5

watched用过去时表示说话人强调“看”这个动作
washing 用进行时表示做“看”这个动作的时间，如改成She was watching TV while she was washing clothes.可能引起歧义，“她”可能是俩个不同的人