名师点拨
一 who 引导的定语从句 Grammar
在复合句中，修饰某一名词或代词的从句叫作定语从句。如：
He is the boy who won the photo competition last year! 他就是去年赢得摄影比赛的那个男生！
上面句子中的 boy 是定语从句所修饰的词，叫先行词，定语从句由关系代词引导，放在先行词之后。
引导定语从句的关系代词有 that, which 和 who（宾格 whom）等，它们放在先行词和定语从句之间起连接作用，同时在从句中充当句子成分。本单元我们主要学习由 who（宾格 whom）引导的定语从句。

【注意】定语从句中谓语动词的单复数应与先行词的单复数保持一致。
专练 用 who 或 whom 改写句子，每空一词
1. Jim’s mother is an English teacher.
Jim’s mother is a teacher English.
2. The beautiful girl is my sister. I talked with her just now.
The beautiful girl just now is my sister.
3. The woman with long hair is my mother.
The woman long hair is my mother.

1. who teaches
2. who / whom I talked with
3. who has