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.