WHO,WHOM,NO MATTER WHO 三者有什么区分

who 是主格
Who is there?谁在那儿?
whom是宾格
Whom did you see there?你在那里见了谁?
不过现代英语中多以who替代whom,尤其在口语中,所以这样说更自然：
Who did see there?
no matter who的意思是‘不管是谁’,如：
i don't give a damn,no matter who you are.不管你是谁,我都不在乎.