定语从句概论一、定语从句最重要的两个概念：先行词+关系代词I don’t like the people who never keep their word.先行词是people，关系词（代词+连接作用）二、关系词在定语从句中充当的成分（主语、宾语（动宾/介宾））1.The world is a book, and those who do not travel read only one page.2.Anger is a thief who steals away the nice moment.3.He who is not handsome at 20,nor strong at 30,nor rich at 40,nor wise at 50,will never be handsome ,strong, rich, or wise.4.There is this difference between happiness and wisdom: the person who thinks himself the happiest man really is so ;but the person who thinks himself the wisest is generally the greatest fool.5.I’d prefer someone who I have something in common with –who I can talk to easily.6.It’s hard to have a friend who you can trust completely.7.It’s hard to have a friend you can trust completely.(作宾语的关系词可省略)8.I hope I never have a boss I can’t talk to about my problem.三、关系代词与先行词的搭配先行词指人，关系代词用who或whom。
高考英语语法复习定语从句知识讲解一、概念定义：用来说明主句中某一名词或代词（有时也可说明整个主句或主句中一部分）而起定语作用的句子叫做定语从句。
简单地讲：定语从句就是修饰名词或代词的作定语的句子。
大家要清楚一个概念，那就是它就相当于一个形容词，作后置定语，所以定语从句通常又被称为形容词性从句。
可以解释为什么什么样的人或物。
☆前置形容词的位置顺序：Op sh a c o m （记住这个无意义的单词）: opinion shape age colour origin materialtwo very nice small French wooden chairsan interesting little red French oil painting定语从句的位置只能放在它所修饰词的后面，被修饰的词我们叫它“先行词”。
Tom, who is 17, is my classmate.Tom is my classmate, who is 17.（Tom就是先行词）二、结构被修饰的名词 / 代词 + 关系词 + 从句"被修饰的名词/代词“ = "先行词"这儿要强调的是先行词只能是名词或代词“先行词”与“关系词”之间实质上是互等、互换的关系。
关系词的作用就是将先行词所表达意义“代到”从句中来起作用。
“先行词”往往是分别重复出现在两个句中(主句和从句)的名词或代词。
先行词可以看成区别定语从句和名词性从句的标记。
看以下两句：That’s all that I have told him. 此句为定语从句，先行词为allThat’s what I have told him. 此句为表语从句，由what引导，没有先行词。
★那为什么一定要有关系词呢？关系词可以看作是连接主句和从句的桥梁，它指代先行词在从句中充当一个句子成份。
这就体现了英语句子的链形结构，英语的句子逻辑性很强，就象一环扣一环的链条。
定语从句一定义及相关术语1．定语从句：修饰某一名词或代词的从句叫定语从句。
定语从句一般紧跟在它所修饰的词之后.2．先行词：被定语从句修饰的词叫先行词。
3．关系词:引导定语从句的词叫关系词.关系词有关系代词和关系副词。
关系代词有that, which, who，whom，whose, as等;关系副词有when，where，why等The man who is shaking hands with my father is a policeman.注意:弄清楚关系词在定语从句中充当什么成分，是掌握定语从句、选择好关系词的关键.二关系代词引导的定语从句1。
who 指人，在定语从句中作主语。
The boys who are playing football are from Class One. 正在踢足球的男孩是一班的。
Yesterday I helped an old man who had lost his way。
昨天我帮助了一位迷路的老人。
That is the teacher who teaches us physics。
那就是教我们物理的老师。
2。
whom 指人，在定语从句中做宾语，常可省略，在口语或非正式文体中常可用who 来代替。
Li Ming is just the boy (whom) I want to see。
李明正是我想要见的男孩。
The professor （whom）you are waiting for has come。
你正在等的教授已经来了。
The girl （whom) the teacher often praises is our monitor。
老师经常表扬的那个女孩是我们的班长。
3.which 指物，在定语从句中做主语或宾语，做宾语时常可省略。
Football is a game which is liked by most boys。
足球是大多数男孩所喜欢的运动。
