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who在句子中作主语，相当于名词、人称代词主格，译为“谁”，后面不加名词，whose在居中作定语，相当于形容词，用来代替名词所有格、人称代词所有格，译为“谁的”后面必须加名词，问事物是用whose问人时用who。
定语从句中who，whom，whose的用法的区别
1.关系代词who、whom的用法
who和whom均只用于指人，不用于指事或物，其中who在定语从句中用作主语，whom在定语从句中用作宾语。如：
I met a girl who knew your sister.
我碰到一个认识你姐姐的姑娘。
In Berlin, he first met the woman whom he would one day marry.
在柏林，他第一次遇见那个女人，后来他终于跟她结了婚。
She introduced me to her husband, whom I hadn’t met before.
她把我介绍给她丈夫，我以前没见过他。
但是，用作宾语的whom如果不是紧跟在介词之后，通常会被省略或用who, that代之。如：
The person to whom I complained is the manager.
我向他投诉的那个人是经理。
The person (who, whom, that) I complained to is the manager.
我向他投诉的那个人是经理。
2.关系代词whose的用法
关系代词whose既可用于指人，也可用于指事或物，它在定语从句中主要用作定语。如：
She is the woman whose car was stolen.
她就是汽车被盗的那个女人。
This is the house whose windows were broken.
这就是窗户被打破了的房子。
Mrs. Gray, whose children are in college, is trying to get a job.
格雷太太的孩子们都在上大学，她想找一份工作。
His house, whose windows were all broken, was a depressing sight.
他的房子窗户无一完好，一派令人心酸的景象。