回答如下:
1.在定语从句中,它们都是关系代词,但在用法上不同:
关系代词whom在定语从句中指代人,可以作宾语,并且可以省略。但是,若作介词宾语,并且介词提前,whom则不能省略。例如:
The man (whom) you mentioned is in the office on the second floor. 你提到的那个男人现在在二楼办公室。
I don't know the girl (whom) you talked about. 我不认识你听到的那个姑娘。
= I don't know the girl about whom you talked.
2. 关系代词whose指代人或物,在定语从句中作定语,表示“......的”。whose + 名词 = the 名词 + of + whom / which = of + whom / which + the 名词。例如:
He knows the doctor whose son (= the son of whom / of whom the son) is a teacher. 他认识那位儿子是老师的医生。
The book whose cover (= the cover of which / of which the cover) is red is mine. 封面是红色的那本书是我的。
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