在all that should be done has been done用了has,但在all that should come have come 中为什么用have

在all that should be done has been done用了has,但在all that should come have come 中为什么用have

题目
在all that should be done has been done用了has,但在all that should come have come 中为什么用have
答案
all的限定,将后面视为一个整体,强调“每一件应该做的事都做了”,作单数使用.如all i want is .
而如果是all 后面直接跟复数名词如all the buildings have been destroyed 意为所有大楼都被毁了.
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