【写作必备】定语从句中as的使用方法！

在PTE写作中，考生们如果能够把从句完美的运用在写作考试中，那么写出的文章内容会更加清晰流畅，写作总分自然而然也会提高。那么今天，给大家讲解as在定语从句中的用法！大家要记得正确的用法喔！

01

一、as用作关系代词和关系副词引导限制性定语从句，并在从句中作主语、宾语、状语或表语，构成the same。

先行词之前一旦出现same, such, so, as这些词时，而先行词的后面又跟着一个从句，这时就要考虑是不是要用as作为关系词来连接这个词和这个句子。

例句： 

1. No period in history has had as many important changes ashave taken place in the past century. (as 作主语) 

2. It is so easy a book as every schoolboy can read. （as作宾语） 

3. A wise man seldom talks about such things as he doesn’t understand.（as作宾语） 

4. I shall do it in the same way as you did.（as作状语） 

5. Her skin is as white as snow is. (as作表语)

注意事项

A. 关系代词as在限制性定语从句时，在从句里做宾语时，绝不能省略。

因为很多考生会联想到that和which引导定语从句，做从句里的宾语时可以省略。但是，as引导的定语从句，并且as在定语从句里做宾语时，是绝不能省略的！

例句：

1.  Nowadays, women can receive the same pay as men can receive. 这句话里面，as就绝不能省略。

2. Nowadays, women can receive the same pay that men can receive. 里面的that就可以省略。

所以，这句话也可以说成： 

Nowadays, women can receive the same pay men can receive. 

B. 当先行词被 the same 所修饰时，关系词既可以用 as，也可以用 that。不过一般说来，表示同一种类多用 as，表示同一事物多用 that。

例句：

1. This is the same instrument as I used yesterday.  

这台仪器跟我昨天用过的那台一样。

     

2. This is the same instrument that I used yesterday.  

这就是我昨天用过的那台仪器。  

但是表示抽象概念时，同种类和同一事物是没有绝对区别的，所以as和that两个词可换用。

例句：

I have the same opinion as / that you have.  

02

二、as引导非限制性定语从句。as在定语从句中作主语、表语或宾语。as代指整个主句，而as引导的这个定语从句是用来补充说明整个主句的，可以放在主句之前或者之后。

例句：

1. As we all know, he studies very hard.（as代整个句子，作宾语）

也可说

2. He studies very hard, as we all know.  

   

3. As is known to all, he is the best student in our class.（as代整个句子，作主语）  

也可说：

4. He is the best student in our class, as is known to all.

一些常见的句式有：

（1）as is said above, 正如/就像上面所说的

（2） as is already mentioned above, 正如/就像刚才

（3） as在句子里面的意思是“正如”“就像”

注意事项

A. 关系代词which和as在引导非限制性定语从句时是有区别的。它们的区别就是是：which引导的非限制性定语从句，绝不能放在句首，而as则可以。

1. He studies very hard, as we all know.  

也可说：

2. As we all know, he studies very hard. 

而要是换成which的话，

3. He studies very hard, which we all know.  在句中时，as有“正如”“就像”之意，而which则没有此意。

现在看这两句话的区别：

（1） He studies very hard, which we all know.

（2）He studies very hard, as we all know.  

尽管as和which都做know的宾语，但是“He studies very hard, which we all know. ”这句话意思是他学习很努力，这点我们都知道。

而“He studies very hard, as we all know.” 这句话意思是他学习很努力，正如大家知道的那样。

B. which引导非限制性定语从句作从句里面的介词宾语时，介词可以提到which前面。

例句：

Eric received training in computer for one year, after which he found a job in a big company.

as引导非限制性定语从句作从句里面的宾语时，不能把介词提到as前面的。