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定语从句之专题三:as引导定语从句(系统讲解内在原理)
作者:高  伟    文章来源:本站原创    点击数:    更新时间:2017-07-20    
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2which作宾语时,有时可以替换为as试对比:

He is from the south, which we can know from his accent.(不能插入it

He is from the south, as we can know (it) from his accent.(有无it都可以)

3which作表语时,有时可以替换为as试对比:

He seemed a foreigner, which in fact he was.(不能插入a foreigner

He seemed a foreigner, as in fact he was (a foreigner).(有无a foreigner都可以。因为,在状语从句中,承前省略了a foreigner。) 

总之,as是连词,which是代词,两者截然不同。二者能换用的情况,纯属巧合,并不能说明它们词性相同。打个比方,一个马群和一个牛群,偶尔在同一地方吃草,但是,马还是马牛还是牛。

3.常见的as引导评述性状语从句。见下表,

分类

举例

主系表

as (it) is often the caseas (it) is naturalas (it) seems likely

主系+v-ed

as (it) was pointedas (it) is mentioned/repeated/said

as (it) have been announcedas (it) has been said before

主谓

as (it) often happensas (it) appears

as I remember/understand (it)as we had expected (it)

as I have said (it)as we see/know (it)as everyone knows (it)

注:关于状语从句中的省略,可以参看本章第七节以及第十二章。

4. 注意as/it/what的区别。如,

What is known to us all is that China has the largest population in the world.

what引导主语从句,that引导表语从句)

It is known to us all that China has the largest population in the world.

it作形式主语,真实主语是后边的that从句)

As is known to us all, China has the largest population in the world.

as引导评述性状语从句)

 

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