高中英语定语从句详解
◆英语谚语欣赏
1. He who knows nothing but pretends to know everything is indeed a good-for –nothing. 不懂装懂，一事无成.
2. It’s the first step that costs.千里之行，始于足下
3. He that makes himself a sheep shall be eaten by the wolf. 甘当小绵羊，迟早要喂狼. Ⅰ. 概念：
(1) 定语从句：在主从复合句中用作定语的从句叫定语从句。定语从句一般紧接在先行词(antecedent)后面。
(2) 先行词：被定语从句修饰的成份。先行词可以为一个词，短语，或整个主句。 (3) 引导定语从句的词叫关系词，分为关系代词和关系副词。 关系词的作用：
1) 引导定语从句，连接主句和从句，相当于一个连词；
2) 必在从句中作某个句子成份（可以做主语，宾语，表语，定语，状语）
常用的关系代词: that、 which、 who、whom、whose、as 、but (文语, 置于否定词之后=that/who…not…, \没有……不……\在从句中作主语，宾语) 常用的关系副词（在从句中只作状语）: when、why、 where The student who answered the question was John. I know the reason why he was so angry.
The boy (whom) you are talking to is my brother. I'd like a room whose window looks out over the sea. 定语从句三步： 第一找出先行词；
第二看先行词在定语从句中的语法功能（做主语、宾语或状语）； 第三选择合适的关系词。
Ⅱ. 几个关系代词的基本用法：
●that: 可指人或物；在定语从句中作主语，宾语，表语。(指人时，相当于who或 whom；指物时，相当于which)(一般不用于非限制性定语从句; 不可置于介词后作宾语) 如： 1. A letter that/which is written in pencil is difficult to read. (主语) 2. Do you know the gentleman that/who spoke just now? 3. You can take anything ( that) you like. （宾语）
4. What is the question (that/which) they are talking about? 5. Here is the man ( who/whom/that ) you want to see.
6. She's no longer the girl ( that) she used to be before.（表语） 7. Our hometown is no longer the one (that) it used to be. = Our hometown is not the same as it used to be.
= Our hometown is different from what it used to be。 = Our hometown is not what it used to be.
●which: 指物；在定语从句中作主语，宾语，表语，定语。如：
1. The book which/that was on the desk was bought by my father.（主语） 2. The book (which/that) I bought yesterday is very interesting.（宾语） 3. The factory in whi