定语从句who/which/that一次分清：先行词指人用who指物用which，that全能选手，从句动词跟着先行词
引言
定语从句是中考必考语法，也是很多同学一看到长句子就发晕的地方。其实记住一个核心就够了：定语从句就是拿一句话去修饰前面的名词，选哪个关系代词，看前面这个名词是人是物。
核心概念：什么是定语从句
```text
定语从句 = 用一句话来修饰前面的名词（先行词）
The boy is my friend.
The boy wears glasses.
→ The boy who wears glasses is my friend.
（who wears glasses 修饰 the boy）
```
一句话说不清这个名词是哪个，就用定语从句把它"定住"。
关系代词三选一
```text
先行词指人 → who / that
先行词指物 → which / that
that 是全能选手，人和物都能用
The boy who wears glasses is my friend.（指人 → who）
The movie which we watched is great.（指物 → which）
The book that I bought is interesting.（that 可指人可指物）
```
两个必踩的坑
```text
坑一：which 不配人，who 不指物
The boy which wears glasses. ✗ 错误
The boy who wears glasses. ✓ 正确
I like the movie who we watched. ✗ 错误（movie 是物）
I like the movie that we watched. ✓ 正确
```
```text
坑二：从句动词跟着先行词走，不是跟着关系代词
The students who is reading are in Class One. ✗ 错误
The students who are reading are in Class One. ✓ 正确
（先行词 students 是复数 → 动词用 are）
```
真题实战
```text
I like the movie ______ we watched yesterday.
先行词：the movie（指物）
从句缺什么：we watched the movie，缺宾语
答案：that / which
I like the movie that we watched yesterday.
```
实战练习
```text
- The girl ______ is singing is my sister.（指人 → who）
- This is the house ______ we lived in.（指物 → which/that）
- The students ______ are reading are in Class Two.
（先行词 students 复数 → who are）
- The book ______ I borrowed is very interesting.
（指物，做宾语 → that/which）
```
总结
```text
定语从句修饰先行词（前面的名词）
指人用 who，指物用 which，that 全能
从句动词跟着先行词走
口诀：定语从句修饰谁，先行词先来站队
指人 who，指物 which，that 全能不怕累
```
```text
今日小抄：
The boy who wears glasses is my friend.
The movie that we watched yesterday is great.
先行词指人 who/that，指物 which/that
动词跟先行词：students → who are reading
```