who和whom引导的从句用来修饰人,分别作从句中的主语和宾语,whom作宾语时,要注意它可以作动词的宾语也可以作介词的宾语
e.g.I don`t know the man who is standing there.
(who代指先行词man,在从句中作主语);
The soldier whom you want to see has already come.
(whom是宾格,在定语从句中作see的宾语.当然,这里也可用who)
The boy with whom I was playing is my cousin.
(这里只用 whom,因为是在介词之后.)
whose是关系代词,修饰名词作定语,相当于所修饰成分的前置所有格
e.g.Do you know the girl whose father is a doctor?
(这里 whose 相当于the girl`s,修饰father)