定語從句中關系代詞as的用法
定語從句是指一類由關系詞引導的從句,因為這類從句的句法功能多是做定語，所以曾被稱為定語從句，這類從句除了可以做定語之外，還可以充當狀語等其他成分，所以現代語言學多使用“關系從句”這一術語。下面為大家帶來了定語從句中關系代詞as的用法，歡迎大家參考！
一、AS引導限制性定語從句。
AS引導限制性定語從句時,通常和such,the same,as(so)等連用,構成such...as/such as,the same...as/the same as,as(so)...as等結構,在從句中可作主語,賓語和表語。
1.such...as/such as意為“...的那種...,像那樣的”，such...as/such
as引導限制性定語從句時,既可指人,也可指物。such用于名詞之前時,具有形容詞性質;such單獨使用(即后面不接名詞)時,具有代詞性質。
Don’t trust such men as praise you to your face.(as作主語)
不要相信那種當面吹捧你的人。
You should read only such books as you can understand without much difficulty.(as作賓語)
你應當只讀那些你讀起來不太難懂的書。
Associate with such as will improve your manners.(as作主語)
要和能改善你的言行的那種人結交。
2.the same...as/the same as意為“與...同樣的”,和such一樣,the same既有形容詞作用,又有代詞性質。
We have arrived at the same conclusoin as they have.(as作賓語)
我們已得出和他們同樣的結論。
比較:the same...as和the same...that不同,前者是“同那一個相似”,后者是“正是那一個”。如：
This is the same watch as I lost.
這同我丟的那塊表一樣。
This is the same watch that I lost
這正是我丟的那塊表。
3.as(so)...as意為“和...一樣”,后接由many,much等修飾的名詞或由形容詞修飾的單數名詞,注意其語序為as(so)+adj.+a+n+as,如：
It’s as pleasant a film as I have ever seen.
這是一部和我以往看的同樣好的電影。
As many soldiers as marched were killed.
很多**的戰士都被殺了。
注意:such ...as與such...that ,so...as與 so...that的區別:
that是連詞,引出結果狀語從句,在從句部分不作成分;as是關系代詞,引出定語從句,在從句中可作主語,賓語和表語。比較:
He is such a nice boy that everyone likes him.
He is such a nice boy as everyone likes.
It is so difficult a problem that nobody can work it out.
It is so difficult a problem as nobody can workout.
二、AS引導非限制性定語從句。
AS引導非限制性定語從句時,通常指的不是主句中的某一個名詞(先行詞),而是指整個主句表達的內容,對主句所作的.陳述進行附加說明,意為“這...,如...或正如...”。這種從句可位于主句之前,之中或之后。
As we all know,hainan belongs to China.
hainan,as we all know, belongs to China.
hainan belongs to China,as we all know.
注意下面的習慣用法:
as is well discussed 正如已討論過的
as is often said 正如通常所說
as is often the case 通常就是這樣
as has been pointed 正如所指出的那樣
as has been said before 如上所述
as often happens 如同經常所發生的那樣
as might be expected正如所料
as is well known to all眾所周知
在多數情況下,從句中的謂語助動詞可以省略
as explained before 如前面所解釋的
as mentioned above 如前面所提到的
as shown in the figure 如圖所示
as seen from the table 從表中可以看出
as already discussed 正如已討論過的
高考題精選：
1.______is known to all,China will be an and powerful country in 20 or 30 years’ time.(1994上海)
A.That;advancingB.This;advanced
C.As;advanced D.It;advancing
2.______is mentioned above,the number of the students in senior high schools is increasing.(1999上海)
A.It B.As C.That D.Which
3.These houses are sold at such a low price________people expected.
A.likeB.as C.that D.which
4.________is known to everybody, the moon travels round the earth once every month.(2001NMET)
A.It B.As C.That D.What
5.There at the door stood a girl about the same height __________.(2004北京春)
A.as me B. as mine
C.with mine D. with me
6.__________is reported in the newspapers, talks between the two countries are making progress.(2004北京)
A. It B. As C. That D. What
7._________is often the case, we have worked out the production
plan.(2004江蘇)
A. Which B. When C. WhatD. As
8._______I explained on the phone,your request will be considered at the next meeting.
A.When B.AfterC.AsD.Since
9.The Beatles,_________many of you are old enough to remember,came from Liverpool.
A.what B.that C.how D.as
Keys:CBBBABDCD
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