by the time 何时和when 互换

问题描述:

by the time 何时和when 互换

by the time有一种用法,表示到.为止,一般和完成时连用.
如I had finished my homework by the time my mother came back.

当表示当.的时候可以和when 互换.
如I will leave by the time you arrive.等你到了我就走,可以用when代替.

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