定语从句中as的用法

定语从句中as的用法
定语从句中as的用法

定语从句中as的用法
一、as引导限制性定语从句 主要结构有：the same…as as…as such…as so…as 主句中出现the same,as,such,so修饰先行词,需选择as做关系代词在定语从句中做主语或宾语.1.It’s the same person as we wanted to find yesterday .我们昨天要找的是同一个人.2.Such girls as he knows are good at English .他所认识的女孩都擅长英语.3.Do you have such books as we like 你有我们喜欢那种书吗?4.She will marry as healthy a man as she can find .她将嫁给她能找到的任何一个有钱人.5.There is so warm a house as we want to live in .这里有如此暖和的房子,我们都想住在里面.6.He has so difficult a problem ,as none of us can solve .他有如此难的一个问题,我们没有人能解决.二、引导非限制性定语从句 ⑴ as引导非限制性定语从句,指代整个主句内容,从句可置于句首,句中或句尾 1． As everyone knows ,China is a beautiful country with a long history .每个人都知道,中国是一个有着悠久历史的美丽国家.2． The earth ,as we know ,moves round the sun .地球,我们都知道,围着太阳转.3． Tom works hard and is willing to help others,as we all know.汤母工作努力,并且乐于助人,这一点我们都知道.⑵ 非限制性定语从句中的谓语为被动式时,常用as做主语 be said/known/announced/reported/mentioned/expected/discussed 1.Grammar ,as has been said before,is not a set of dead rules.语法,就像以前所说,不是一套死规则.2.As is known to all ,TaiWan is part of China .⑶ as引导非限制性定语从句,有“如,似,正像”的含义,因此,下列句式多用as as has been said above 如上所说 as anybody can see 正像每个人所看到的那样 as we had expected 正如我们所预料的那样 1.Things are not always as they appear.事情并不一直像他们表面那样.2.The boy has as much progress as we had expected.正像我们所预料的那样,这个男孩取得了大的进步.由as,which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that.As一般放在句首,which在句中.As we know,smoking is harmful to one';s health.The sun heats the earth,which is very important to us.as 和which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语.但不同之处主要有两点：(1） as 引导的定语从句可置于句首,而which不可.(2） as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词；若为行为动词,则从句中的关系代词只能用which
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关系代词AS的用法
AS作关系代词,用来引导定语从句:限制性定语从句和限非制性定语从句
　　
一、AS引导限制性定语从句
　　
　　AS引导限制性定语从句时,通常和such,the same,as(so)等连用,构成such...as...

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关系代词AS的用法
AS作关系代词,用来引导定语从句:限制性定语从句和限非制性定语从句
　　
一、AS引导限制性定语从句
　　
　　AS引导限制性定语从句时,通常和such,the same,as(so)等连用,构成such...as/such as,the same...as/the same as,as(so)...as等结构,在从句中可作主语,宾语和表语。
1.such...as/such as意为“...的那种...,像那样的”，such...as/such
as引导限制性定语从句时,既可指人,也可指物。such用于名词之前时,具有形容词性质；such单独使用(即后面不接名词)时,具有代词性质。
Don’t trust such men as praise you to your face.(as作主语)
不要相信那种当面吹捧你的人。
You should read only such books as you can understand without much difficulty.(as作宾语)
你应当只读那些你读起来不太难懂的书。
Associate with such as will improve your manners.(as作主语)
要和能改善你的言行的那种人结交。
2.the same...as/the same as意为“与...同样的”,和such一样,the same既有形容词作用,又有代词性质。
We have arrived at the same conclusoin as they have.(as作宾语)
我们已得出和他们同样的结论。
比较:the same...as和the same...that不同,前者是“同那一个相似”,后者是“正是那一个”。如：
This is the same watch as I lost.
这同我丢的那块表一样。
This is the same watch that I lost
这正是我丢的那块表。
3.as(so)...as意为“和...一样”,后接由many,much等修饰的名词或由形容词修饰的单数名词,注意其语序为as(so)+adj.+a+n+as,如：
It’s as pleasant a film as I have ever seen.
这是一部和我以往看的同样好的电影。
As many soldiers as marched were killed.
很多游行的战士都被杀了。
注意:such ...as与such...that ,so...as与 so...that的区别:
that是连词,引出结果状语从句,在从句部分不作成分;as是关系代词,引出定语从句,在从句中可作主语,宾语和表语。比较:
　　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引导非限制性定语从句
　　
　　AS引导非限制性定语从句时,通常指的不是主句中的某一个名词(先行词),而是指整个主句表达的内容,对主句所作的陈述进行附加说明,意为“这...,如...或正如...”。这种从句可位于主句之前,之中或之后。
　　As we all know,Taiwan belongs to China.
　　Taiwan,as we all know, belongs to China.
　　Taiwan belongs to China,as we all know.
　　注意下面的习惯用法:
　　as is well discussed 正如已讨论过的
　　as is often said 正如通常所说
　　as is often the case 通常就是这样
　　as has been pointed 正如所指出的那样
　　as has been said before 如上所述
　　as often happens 如同经常所发生的那样
　　as might be expected正如所料
　　as is well known to all众所周知
　　在多数情况下,从句中的谓语助动词可以省略
　　as explained before 如前面所解释的
　　as mentioned above 如前面所提到的
　　as shown in the figure 如图所示
　　as seen from the table 从表中可以看出
　　as already discussed 正如已讨论过的
　　高考题精选：
　　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江苏)
　　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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as+adj.（原级）+as