【大学英语四级考点一：】关系代词who，whom，which，that和whose的使用区别
1．who指人，在定语从句中作主语或宾语。
e.g.: The boys who are playing football are from Class One.
2．whom指人，在定语从句中作宾语，常可省略。
e.g.: Mr Liu is the person (whom) you talked about just now.
3．which 指物，在定语从句中作主语或宾语，作宾语时常可省略。
e.g.: The book which he gave me is very interesting.
4．that 指人时，相当于who 或whom；指物时，相当于which。在定语从句中作主语或宾语，作宾语时常可省略。
e.g.: She is the pop star (that) I want to see very much.
5．whose可指人或物，修饰名词或代词，在定语从句中充当定语。“whose＋名词”可改为“the＋名词＋of which/whom”或“of which/whom the＋名词”。
e.g.: The house whose windows are very large is my uncle's.＝The house of which the windows are very large is my uncle's.
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