内容正文：
Unit4 Discovering Useful Structures
The Attributive Clauses
定语从句
01 基础知识(定义)
02 定语从句的划分
03 关系词的使用
04 关系词的省略问题
基础知识
Synergistically utilize technically sound portals with frictionless chains. Dramatically customize empowered networks rather than goal-opportunities.
定语从句
一、基础知识
定语从句：是指在复合句中，
多用来修饰 或 的从句.
一般位于被修饰成分之后，被修饰的成分称为 “ ”
名词、名词短语
先行词
代词
定语从句
二、定语从句的划分：
分为限定性定语从句和非限定性定语从句。非限定性定语从句用逗号与主句隔开，不能由that来引导。
定语从句
The Restrictive Attributive
Clause
限制性定语从句
The Non-Restrictive Attributive Clause
非限制性定语从句
定语从句
三、关系词
分为关系代词（who、whom、whose、that、which）和关系副词（when、where、why）关系词指代先行词，并一定在定语从句中以先行词的身份充当某个成分（主语、宾语、定语、表语或状语）
定语从句
引导定语从句的关系词
who 先行词是人，从句中作主语或宾语
whom 先行词是人，从句中作宾语
which 先行词是物，从句中作主语或宾语
that 先行词是人或物，从句中作主语或宾语
whose 先行词人或物，从句中作定语
定语从句
关系副词：
When 先行词需是表示时间的名词，在从句中作时间状语
Where 先行词需是表示地点的名词，在从句中作地点状语
Why 先行词只能是reason，从句中作主原因状语
What、How无论什么时候都不能引导定语从句
定语从句
I like the girl.
The girl has big eyes.
I like the girl who has big eyes.
定语从句
I like the girl.
The girl's eyes are very big.
I like the girl whose eyes are very big.
定语从句
Please pass me the book.
The book's cover is green.
Please pass me the book whose cover is green.
定语从句
I don't like the novel.
You are reading the novel.
I don't like the novel which you are reading.
定语从句
That was a fault.
The fault couldn't be forgiven.
That was a fault which couldn't be forgiven.
定语从句
Who is the man?
You are talking about the man.
Who is the man whom you are talking about?
that/who 之前不能要介词，若有介词需用whom/which
Who is the man about whom you are talking?
Howard:You're not going with us.
Sheldon:Why not?
Raj:You're the guy we're trying to get away from.
Sheldon:Oh.Well,in that case,I don't need my jacket.And for the record,the correct syntax(句法；语法) is' I'm the guy from whom you're trying to get away.'
定语从句
I will never forget th