定语从句作为英语语法，在学习过程中属于中较难理解与掌握的部分，也正是由于其复杂程度较高、逻辑性较强、理解难度很大，屡屡让童鞋们在考试中丢分数、失信心、丧斗志！
如果你对这一部分的内容不太熟悉的话，一定要好好看看这篇文章！
4.As引导定语从句用法
(1)As既可以引导限制性定语从句也可以用于非限定性定句中充当主语，宾语，表语等。
常用于以下句型当中：Such/so…..as….像…..一样the same….as…和…...同样的
A computer is so useful a machine as we can use everyday.
He is not the same man as he was.
(2)引导非限制性定语从句，此时译为“正如，像”等。可以放在句首，句中或句末。
As I remember,there were a net bar here.
Taiwan is an inseparable part of China,as is known to all.
★the same as...和the same that...引导定语从句的区别
This is the same bike that I lost yesterday.(同一事物)
This is the same bike as I lost yesterday.（同类事物）
5.关系副词的运用
(1)When在定语从句中做时间状语，先行词为表示时间的time,day等
I still remember the day when I first came to Beijing.(when=on which)
(2)Where在定语从句中做地点状语，先行词为表地点的place,spot等
Can you tell me the office where he works?
(where=in which)
(3)Why在定语从句中做原因状语，先行词只有reason.
I don’t want to listen to any reason why you were absent.
(why=for which)
★关系副词=相应的介词+关系代词
★Where引导的定语从句还可以修饰抽象空间的名词如case(情形)，situation,position(位置),stage(阶段)，point（地步）等
What are the situations where body language is the only form of communication?
在哪些情况下身体语言是的沟通方式。(此时where=in which)
6.几个特殊的先行词
(1)way在定语从句中做状语时的三种引导方式that/in which/不填
The way in which/that/不填he explains the sentence to us is quite simple.
比较：The way which/that/不填he told to us was quite simple.
★way在定语中作tell的宾语
(2)先行词time
time表示“次数”时，用关系代词that引导定语从句
This is the first time that the president has visited the country.
time作“一段时间”讲时，应用关系副词when
This was the time when there were no radios,no telephones or no TV sets
★此时when=during which在..期间
(3)先行词reason当在定语从句中作状语时，定语从句的4种引导方式why/for which/that/不填
This is the reason why/for which/that/不填he can not come here.
比较：Is this the reason that/which/不填he explained to us for his absence from the conference.
★reason在定语从句中做explain的宾语
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