WHO 和WHOM的用法

问题描述:

WHO 和WHOM的用法
一直以来我都搞不清这两个词的区别
能不能举简单的例子?

WHO 可以做主语,又可以做宾语
WHOM只能做宾语
例子:1,who are you?不能是whom are you?
2,This book belongs to whom/who?两者都可以