定语从句who和whom怎么区分？现将它们的区别详解如下：

1. who可引导限制性定语从句，用于指代人，在从句中作主语或宾语

The man who was driving a red car is my brother. 

开着红色汽车的男士是我兄弟。

【who指代人（the man），在从句中作主语。】

He was the one who did all the talking. 

都是他在说话。

【who指代人（the one），在从句中作主语。】

I am surrounded by the people who I like. 

我周围的人都是我喜欢的。

【who指代人（the people），在从句中作宾语。】

2. whom可引导限制性定语从句，在从句中作宾语，通常可与who替换使用，whom较正式

The student whom/who you scolded was very upset. 

被你责备的那个学生非常沮丧。

【whom指代人（the student），在从句中作宾语。】

The family whom/who I met at the bus station were very kind. 

我在公车站遇见的那家人很友好。

【whom指代人（the family），在从句中作宾语。】

3.who与whom作宾语时，常可省略

The student (whom/who) you scolded was very upset. 

The family (whom/who) I met at the bus station were very kind.

I am surrounded by the people (whom/who) I like.

The boy (who/whom) I spoke to is a nice person. （whom作介词to的宾语）

4. whom作介词宾语时，介词可提前至whom前，此时，whom不可省略； 

The boy whom I spoke to is a nice person. 

与我讲话的男孩子是个不错的人。

= The boy to whom I spoke is a nice person. （whom不可省）

The retailer whom I purchased my laptop from is an old man. 

卖我笔记本电脑的零售商是个老人。

= The retailer from whom I purchased my laptop is an old man. 

（whom不可省）

5. who则不可紧接介词， 因此介词不可提前至who前

The boy who I spoke to is a nice person. （√）

The boy to who I spoke is a nice person. （×）

6.who与whom可引导非限制性定语从句，指代人，不可省略；

who可在从句中作主语或宾语，whom只能在从句中作宾语

Amy, who was my roommate, is married. 

艾米结婚了，她之前是我的室友。

【who指代人（Amy），在从句中作主语，不可省略】

She was introduced to the author, whom she was excited to meet. 

她被介绍给了那个作者，她很激动见他。

【whom指代人（the author），在从句中作宾语，不可省略】

 David, who/whom I am working for, is a foreigner. 

我为大卫工作，他是个外国人。【who/whom作宾语时，不可省略】

whom作介词宾语时，介词常可提前，whom不可省略；

who作介词宾语时，介词不可提前

This woman, whom he had lived with for two years, had never known him. 

这女人和他住在一起两年了，她从来都没有真正认识他。

= This woman, with whom he had lived for two years, had never known him.

David, who I am working for, is a foreigner. （√）

David, for who I am working, is a foreigner. （×）

以上就是定语从句who和whom的区分，希望对你有所帮助。你可能需要深入理解：用who不用that的定语从句