很高兴为您
从意义上说：WHO "谁,什么人" WHOM”谁,什么人“（who的宾格形式）
WHOSE"谁的"
三者都是疑问代词
1）who代表人,在从句中作主语：
The man who robbed her has been arrested.抢她东西的人被捕了.
2）whom 也代表人,但在从句中作宾语或介词宾语：
The man whom I saw told me to come back today.我见到的那个人让我今天再来.
在口语中常可用who代替,也可省略：
The man(who) I saw told me to wait.我见到的那个人让我等一会儿.
但紧跟介词时只能用whom：
The man to whom I spoke was a foreigner.我找他讲话的那人是外国人.
3）whose表示“某人的”,在从句中作定语：
A mental patient is one whose mind is diseased.精神病人就是脑子有病的人.
有时可指无生命的东西:
He saw a house whose windows were all broken.他看见一所房子,窗子全都破了.
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