by the time和when 能互换吗不是都有 当那时 的意思吗

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by the time和when 能互换吗
不是都有 当那时 的意思吗

要看具体语境
by the time 有在.之前的意思,
而when的意思是在.的时候

by本身有‘....之前’的意思。
by the time是典型的要求完成时态的词组，比如：
By then, he was 15。
那时他已经15岁了。（到那时之前......）
By the time she gets there, they will have covered everything.
她到那里之前，他们就已经掩盖了一切。

不能，by the time有“到....为止”的意思，而when 就不含有这种意思

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