英语的语法有很多，其实在语法方面跟我们学习中文的语法相似，也分为主语 ，定语以及其他的一些句子。那么，关于考研英语语法重点之定语从句的问题，相信很多人不是很清楚。一起来看下。

考研英语语法重点之定语从句(下)：

一、语从句里面的关系代词的用法。

1.常用的关系代词：which, that, who, whom。Whom现在用的很少。前面有介词只能用which，不能用that。

2. 关系代词在考试中的特殊情况。

What:

1)它是子母同体。相当于一个关系代词以及一个先行词。What前面不应该在出现先行词。 如果前面已经偶一个关系词，就不能用what来引导。例如：You can have everything what you like. what=all that,所以这儿不能用what.

All---is a continuous supplying of the basic necessities of life

A. what is the need B. the things need

C. for our needs D. that is need

2)what单独使用，后面不加名词。

例如：She is not what she used to be.

3)what 后面加名词

例如：What money I have has been given to you.

1997年考题：______he knows about it is out of date and in accurate

A. What little B. So much

C How much D . So little

As

1)like

2)作为

3)when

4)引导定语从句。即可引导限制性定语从句，也可以引导非限制性定语从句。引导限制性定语从句一般式固定用法。如as…as, such…as

as引导非限制性定语从句

例如：I was a boy which you know. which可以用as替换。

As is so often pointed out knowledge is a two edge weapon which can be used equally for good or evil.

as引导限制性定语从句

考试中往往考固定搭配。

例如：Such a student as works hard were be sure to succeed.

than 作为关系代词可以引导定语从句

More families consist of one parent households or two working parents; consequently, children are likely to have less supervision at home ____ was common in the traditional family structure .

A.than B.that C.which D.as

特点：

1)than作为关系代词引导词在从句中一般必须做主语或者作宾语。

2)than 前面的主句必须要有比较级

3)比较级所修饰的名词就是than指代的对象

二、关系副词

When引导的定语从句。

1)先行词必须是表示时间的名词。

Or so the thinking has gone since the early 1980s, when juries began holding more companies liable for their customers’ misfortunes.

2)如何区分when引导的定语从句和状语从句。用句子表示状语就是状语从句。例如：When I go to school, I will work hard.

从两方面区分：

When 引导的定语从句前一定有表示时间的名词;When 引导的状语语从句前没有有表示时间的名词。

从翻译的角度看如果是引导的定语从句可以不翻译。如果是状语从句就必须翻译成当……时候。

When=on which

Where

where=in which

where引导的从句先行词必须是表示地点的名词。例如：

I was born in Beijing where the Olympic games will be held.

先行词表示地点,不一定用where来引导。例如：

I have never been to Beijing ,but it’s the place __.

A.where I’dlike to visit

B.in which I’d like to visit

C.I most want to visit

D.thar I want to visit it most