介绍:
造句：在会上讲话的那个男人是一个工人。
The man who is speaking at a meeting is a worker
造句：我喜欢的女人是一个工人
⚠️ 1. 确定先行词。 2.找出做“定语从句”的部分。（XXXX的）
坐在我左边的这个男孩养了一只狗。
The boy that is sitting on my left has a dog.
以后注意，关系代词代替先行词，不要重复添加主语
whose：作从句的定语。
例子：I met the boy before.
The boy's mom is a doctor.
合并为？
I met the boy whose mom is a doctor before
（1）关系代词
先行词是物：that/which
先行词是人：who/whom/whose/that
ps: who做主语或者宾语／whom作宾语／that既可以指人也可以指物
1. 当先行词是下列不定代词或被它们修饰时much, little, none, all, few, every(thing), any(thing), no(thing) 等时，通常用that
⚠️不定代词
练习：我不会做任何会伤害你的事。
I met the boy whose mom is a doctor before. 这个句子，完全可以说I met the boy before. His mom is a doctor.
hurt 伤害（及物动词）
I won't do anything that will hurt you.
2. 当先行词有the very, the only, the same 等修饰时，通常用that
造句：她是我唯一喜欢的女孩。
She is the only girl that I like
3. 当先行词有形容词最高级或序数词(包括last, next等)等修饰时，通常用that
造句：这是我见过的最美的照片。
This is the most beautiful picture that I have ever seen.
5.当先行词是一个既指人又指物的并列词组时，通常用that：
They talked about the persons and things that most impressed them. 他们谈论了使他们印象最深的人和事。
6. 当要避免重复时：
Which is the course that we are to take? 我们选哪门课程？
Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯？
4. 当关系代词在定语从句中用作表语时，通常用that(可省略）：
China is not the country (that) it was. 中国已不是过去的中国了。
放下be动词后面都是表语
