WHO 代的是从句中的主语.
WHOM代从句中的并语.
比如：
She is the girl whom I am falling in love with.
Shi is Mary who is my mother.
Who 和 Whom引导定语从句时的区别?
WHO 代的是从句中的主语.
WHOM代从句中的并语.
比如：
She is the girl whom I am falling in love with.
Shi is Mary who is my mother.