as与which引导非限制性定语从句的区别

、。as与which引导非限制性定语从句

的区别

as 的特殊用法

1、如果要说明两者有相似之处时通常用as，表达“正如（情形或事实所表示）的那样、像……的一样”的意思。例如：She is a fine singer，as her mother used to be．她是一个很出色的歌唱家，和她母亲当年一样。

She is the same age as you (are).

她和你年龄一样大。[与same...as 连用]

I hope to get such a dictionary as h e is using. 我希望有一本和你正在用的一样的词典。[与such...as连用]

As water is to fish, so air is to ma n. 正如水对鱼一样重要，空气对于人同样重要。

She has married again，as was/seeme d natural．她又结婚了，这很自然。

2、as常与从句中的know，see，hear，expect等动词连用，也常用于as often hap pens，as is often the case（常有的事）等句子中。

As you know, he is from Beijing. 正如你所知道的，他来自北京。

As is known to everybody，the moo n travels round the earth once every mo nth．

He was absent，as is often the case

As you will find out, all is now settled. 你将会看到这样的情况，一切都已搞定了。

3、as引导的非限制性定语从句的位置比较灵活，既可位于所修饰的句子之后，也可位于句中或句首；而由which引导的非限制性定语从句一般不位于句首。例如：

As you will find out，I will never le t you down．你将会发现，我绝不会使你失望的。

4、as所引导的从句所表达的语意须和主句一致，表示在预料之内的，就用as,

而which则用于表示在预料之外的情况，或突发性的事情。例如：

She has married again，which was u nexpected．她又结婚了，真不可思议。（此处不可用as）

5. The burst of the gas pipes happene

d th

e other day, which shocked all o

f u s.

这类定语从句只能由which 或as 引导。两者之间的区别在于：

1. which 引导的定语从句只能位于主句后，但as引导的从句可位于主句前、中、后。如：

David, as you know, is a photograo pher. 戴维是个摄影师，你是知道的。(不可用which)

Li Ming is late, as is often the case.李明迟到了，这事是经常发生的。(不可用which)

2. as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。如：

Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了，这件事使张先生非常生气。(不可用as)

3. as 引导的定语从句只表示一个众所周知或意料之中的事，但which 不受此限制。如：

He married her, which was unexpec ted. 他和她结婚了，这是出乎意料的。(不可用as)

4. as有“正如”之意，而which则意为“这(件事，一点)”，可用and this/that/ it来代替。

5. as多用于固定搭配中：as is often t he case(这是常有的事)，as was expected (不出所料)，as often happens(正如经常发生的那样)，as is known to all(众所周知)，as has been said before(如上所述)，as is mentioned above(正如上面所提到的)等。

注：which 代表整个句子，还可用于i n which case, at which point, on which occasion等。如：

I may have to work late, in which case I’ll telephone you. 我可能得晚点下班，那样我会给你打电话的