Question

求助英语选择题解答、。

Tom will have done this work before his boss comes back tomorrow.

这里解释说：一般现在时comes用于时间状语从句，代替一般将来时。
请问是什么叼意思？这里为什么要用comes。。。》》》？？

Answer 1

Tom will have done this work before his boss comes back tomorrow.
这个句子本身应该是这样的Tom will have done this work before his boss will come back tomorrow.
前后都用将来时，但是出现了两个will，因为重复，说话的习惯是尽可能简单的。所以把相对不重要的will去掉，就是从句的will去掉。。。然后就变成了his boss come back tomorrow. 这也就是一般现在时的形式了，所以是he comes