all is mine 为什么be动词用is,all不是复数吗

问题描述:

all is mine 为什么be动词用is,all不是复数吗

all是代词 可以代替可数名词也可以代替不可数名词
如there is much water in the bottle.all is mine.
there are some books on the desk.all are mine.
要视情况而定