定语从句who和whom详解，不要写一大堆没有用的

who是主格，whom是宾格。做主语时用 who，做宾语时用 whom
如：The boy who is 15 is my brother.这里是who从句的主语，所以用who
The boy whom I like is 15。这里whom做从句的宾语，所以用whom

who 可以做主语和宾语
whom 只能做宾语
因此 当在定于从句中做指人的主语时只能用who
例如：Is there anyone here who will go with you?

当空前有介词的时候
只能用whom，不能用who
例如：The man of whom leg is hurt is very old

1、who是作主语的，whom是作宾格的。
2、先行词后有介词就用whom，否即就用who。
我是从事英语的，乐意为你解答。

如果先行词在定语从句中的成分是主语就用who 如果是宾语就用whom

The one over there is John who once owned a company.

The author whom you criticized in your review has written a letter in reply.

没有什么大区别吧

但who是比较通用的

whom是做宾语的时候用

一般只用who就可以了，日常生活中外国人是不用whom的

whom是宾格，who作宾语时的形式