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he will have arrived by this time tomorrow.为什么要用现在完成时?

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he will have arrived by this time tomorrow.为什么要用现在完成时?
明天的这个时候他已经到了.
将来完成时如果应用于时间状语从句中,就要用现在完成时来代替.
我举个例子:
I will go to school when he has arrived by this time tomorrow.
当他明天这个时候到的时候,我就会去上学去了.
如果你不变成现在完成时,一看就不对:
I will go to school when he will have arrived by this time tomorrow.
It will rain tomorrow.
I will take a umbrella with me if it rains tomorrow.
第一句是将来时,到第二句就成了一般现在时,因为它成了条件状语从句.