as在定语从句中的用法
关系代词as 引导的定语从句
1、as 可以在定语从句中做主语或宾语，代表前面整个句子。如：
He married her, as was natural.
他跟她结婚了，这是很自然的事。
He is honest, as we can see.
他很诚实，这一点我们看得出来。
2、as 引导的非限制性定语从句可以放在主句之前、主句之后，甚至还可以分割主句。另外，as 常
常有“正如、正像”的含义。如：
As is known to all, China is a developing country.
众所周知，中国是发展中国家。
He is from the south, as we can know from his accent.
他是南方人，从他的口音我们就可以知道。
John, as you know, is a famous writer.
正如你所知，约翰是个著名作家。
3、当先行词受such, the same 修饰时，关系词常用as。如：
I’ve never heard such stories as he tells.
我从未听过象他讲的这样的故事。
He is not such a fool as he looks.
他可不象他看上去的那样傻。
This is the same dictionary as I lost last week.
这部词典跟我上星期丢失的一样。
注意：
当先行词受the same 修饰时，偶尔也用 that引导定语从句，但与as引导的定语从句意思有区别。如：She wore the same dress that she wore at Mary's wedding.
她穿着她在玛丽婚礼上穿过的那个同一条连衣裙。
She wore the same dress as her younger sister wore.
她穿就像着跟她妹妹所穿的一样的连衣裙。
as引导定语从句的用法
as引导定语从句的用法 as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which 引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思 (1) As is known to all, China is a developing country. (2) He is from the south, as we can see from his accent. (3) John, as you know, is a famous writer. (4) He has been to Paris more than several times, which I don’t believe. ================================ As 的用法例 1. the same…as；such…as 中的as 是一种固定结构, 和……一样……。 I have got into the same trouble as he (has). 例2. as可引导非限制性从句，常带有'正如'。 As we know, smoking is harmful to one's health. As is known, smoking is harmful to one's health. As是关系代词。例1中的as作know的宾语； 例2中，它充当从句的主语，谓语动词know要用被动式。 一、“as / which”特殊定语从句的先行成分 1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分，如： My grandmother’s house was a lways of great importance to me, as my own is. 在一定的语言环境里，有些名词可以具有形容词的性质。这些名词主要是那些表示人的身份、职业、状态的名词。值得一提的是，在这些具有形容词性质的名词之后，引导定语从句的关系代词不能用who / whom. 2. 动词短语先行成分。 这种动词短语既可是限定形式也可是非限定形式。如果是动态动词短语，它们在从句中就一般有限定或非限定形式的替代动词do和as / which一起代替。do可以出现，也可以不出现，但不能用其它动词代替。 3. 句子作先行成分。 这句子可以是整个主句也可以只是主句中的一个从句。有时是连续几个句子，有时甚至可以是一个完整的故事。 二、“as/which”特殊定语从句在句中的位置 由于先行成分的构成成分不同，“as/which”特殊定语从句在句中的位置有以下几种情况：1. 形容词做先行成分时：形容词或形容词短语（含具有形容词性质的名词）作先行成分，“as / which”特殊定语从句置于先行成分之后。 2. 动词短语作先行成分时：动词短语作先行成分时，“as / which”特殊定语从句置于先行成分之后。但是，当从句中含有表示主观意志的插入成分时，“as”特殊定语从句可以移至句子之首。 3. 句子作先行成分时：“as”特殊定语从句的位置较灵活，可以置于先行成分之前、之中或之后。但如果先行成分是直接引语，“as”特殊定语从句多在先行成分之前。如果先行成分是否定句，“as”特殊定语从句与否定词的相对位置不同可以使它产生不同的意义。由于“as”特殊定语从句具有这一特点，所以有时它的位置不能随便移动。在非正式的文体里，“which”特殊定语从句可以出现在先行成分之中。
as在定语从句中的用法
关系代词as 引导的定语从句 1、as 可以在定语从句中做主语或宾语，代表前面整个句子。如： He married her, as was natural. 他跟她结婚了，这是很自然的事。 He is honest, as we can see. 他很诚实，这一点我们看得出来。 2、as 引导的非限制性定语从句可以放在主句之前、主句之后，甚至还可以分割主句。另外，as 常 常有“正如、正像”的含义。如： As is known to all, China is a developing country. 众所周知，中国是发展中国家。 He is from the south, as we can know from his accent. 他是南方人，从他的口音我们就可以知道。 John, as you know, is a famous writer. 正如你所知，约翰是个著名作家。 3、当先行词受such, the same 修饰时，关系词常用as。如： I’ve never heard such stories as he tells. 我从未听过象他讲的这样的故事。 He is not such a fool as he looks. 他可不象他看上去的那样傻。 This is the same dictionary as I lost last week. 这部词典跟我上星期丢失的一样。 注意： 当先行词受the same 修饰时，偶尔也用 that引导定语从句，但与as引导的定语从句意思有区别。如：She wore the same dress that she wore at Mary's wedding. 她穿着她在玛丽婚礼上穿过的那个同一条连衣裙。 She wore the same dress as her younger sister wore. 她穿就像着跟她妹妹所穿的一样的连衣裙。
as在定语从句中的用法
一.as在定语从句中做关系代词,在从句中充当主语,宾语,或表语,as 做表语习惯省略be动词. as在限制性定语从句中 1.such+名词+as从句 such用来修饰名词 I don't like such a man as talks big.我不喜欢吹牛的人. Such house as she could find was expensive .凡是他能找到的房子都很贵. 注意区别下面两句话 This is such an interesting book as everyone likes.定语从句 as 做宾语这是一本每个人都喜欢的书. This is such an interesting book that everyone likes it. 结果状语从句这是一本有趣的书以至于每个人都喜欢.(such 修饰名词,so修饰形容词或副词) such+名词+as 表列举 I like such animals as dogs ,cats. such +n+as to do sth I am not such a fool to believe her .
such as to do sth Met with disappointments such as to drive me mad . 2.such as从句 such是代词在主句中充当主语,宾语,表语 Such as you see is our house. such as 表列举 I know three languages, such as Chinese,English. such+n+as to =such+n+(that)从句 as such 意思是"本身" Money as such will seldom bring happiness. the same +名词 +as从句 I have the same book as he is reading. 定语从句 as做宾语我有一本和他正在读的一样的一本书.(两本书) I have the same book that he is reading. 定语从句 that做宾语我得到了他正在读的那本书.(同一本书) as(so)+adj+a+名词+as从句只能用名词单数
as 引导定语从句, 在定语从句中作主语、宾语、表语
as的用法: (as引导定语从句,在定语从句中作主语、宾语、表语) (1)如为限制性的，多用于the same …as ; the same as；such …as …; as many/muchas；so …as等结构中。如： 1. I have the same book as you (have).我有一本和你的一样的书。 Her attitude to him was quite the same as it had always been. (关系代词as和指示代词same连用,在从句中用作表语,先行词是same.) 2.---Why didn't you mention that in face of the police just now? --- I thought it was such a minor detail as was hardly worth mentioning. We will only discuss such problems as have something to do with our own interests.Don't do such things as you are not sure about. There is no such place as you dream of in all this world. 比较： I live in the same house that he used to live in. I'm wearing the same shirt as you wore yesterday. 比较： Here is so big a stone as no one can lift.（定语从句） Here is so big a stone that no one can lift it.（结果状语从句） (2)如为非限制性的，多单独引导一个定语从句，这种定语从句可置于句首，句中或句尾，译为"正如，这一点"。（动词常为know, see, expect, point out, etc.） 1. As we all know, smoking is harmful to one's health . (as作宾语) =As is known to all, smoking is harmful to one's health .（as作主语）
as和which的用法区别
非限制性定语从句中的as和which ■as 和which的相同点 (1) as 和which都可引导非限制性定语从句，放在主句之后；在非限制性定语从句中充当从句的主语、宾语或表语。如： Tom has found a good job, as / which we all hope. 汤姆找到了一件好工作，这正是我们大家所希望的。 (2) as 和which都可代表整个句子的内容或主句中的某一成分。如： His mother is ill, which makes him very sad. 他母亲病了，这件事情使他很难过。 He has made great progress, as / which makes us very happy. 他进步了，这使得我们很高兴。 以上两句中的as / which都指前面整个句子的内容。 Though he has lots of money, he still rides his old bike, which was bought ten years ago. 尽管他很有钱，但是他还骑着他的旧单车，这单车是十年前买的。 There you can meet many writers as you have ever read in books. 在那里，你可见到你在书中所读过的很多作家。 ■as与which的区别 (1) 当先行词前面有so + adj. + a / such + (a) + adj. , the same等词修饰时，引导词只能用as，而不用which。如： She is so nice a girl as we all like. 她是个我们大家都喜欢的如此好的女孩。 It is such an interesting book as we all want to read. 它是本我们大家都想读的有趣的书。上面两句中的as就不能用which替换。 (2) as 在从句中常作宾语；作主语时，从句的谓语动词常为系动词，即：系表结构或被动结构。如： As is said above, he has conquered the difficulty. 正如上面所说，他征服了困难。
定语从句用法总结
定语从句用法总结 一.定义：定语由一个句子来充当，那么这个句子就叫做定语从句。 eg: The old town has narrow streets and small houses that are built close to each other.其中划线部分为定语从句。 二.分类：分为限制性定语从句和非限制性定语从句，还有间隔性定语从句。 eg: is the school (that/which)we visited last year. （限制性定语从句） weather turned out to be very good,which was more than we could expect. （非限制性定语从句） days are gone when physical strength was all you needed to make a living.（间隔性定语从句） ] 注：定语从句和非限制性定语从句的区别 限制性定语从句无逗号隔开、不可缺少、起修饰限制作用；而非限制性定语从句有逗号隔开、可有可无、起补充说明作用。 三.构成：定语从句有先行词、引导词和从句构成。 先行词是定语从句所修饰限制的名词或代词。 引导词是用来引导定语从句的关系代词或关系副词。 eg: The old town has narrow streets and small houses that are built close to each other. 此句中先行词为：narrow streets and small houses, ( 引导词为：that，定语从句为：that are built close to each other 四．基本原则 定语从句中不能出现与先行词在意义上相一致的词 is the book that I like it best .(it 与book指同一物，所以要去掉。) 五．定语从句中常见考点：
As引导的定语从句(含配套练习与答案)
As引导的定语从句（配练习与答案） 一、Review定语从句 1. 定语从句的基本用法 2. 限制性定从的基本用法 a. 作用：起限定作用, 不可省，使句意不完整。 b. 位置：位于先行词之后，不用逗号。 c. 翻译：用形容词的形式去翻译。 d. 修饰：先行词。 ! Eg: He has two sisters who are working in the city. （他有两个在城市里工作的妹妹。） 3.非限制性定从 a.作用：起补充说明, 可省。 b.位置：位于先行词之后，用逗号隔开。 c.翻译：译成两个并列句。 Eg: He has two sisters , who are working in the city. (他有两个妹妹，都在城市里工作。) d.不能用“that”引导非限制性定从。 e.修饰：先行词或整个句子。 (which可指代整个句子) f.^ g.Eg: He missed the show, which was a great pity. (他错过了那个节目，真是太遗憾 了。) h.表达先行词部分或全部的数量的结构为：先行词为人：some/all + of +whom 先行词为物：some/all + of +which Eg: Here are the questions , some of which I thought are very easy. 二、as 引导限制性定从 1. as 作关系代词, 可指人也可指物, 在从句中可作主语和宾语。 2. 固定搭配: such as (例如, 象这样)，as…..as (和…..一样)，the same as (与…..相同) Eg: Such people as had made great contributions should be respected. (主语) # Eg: You can take as many books as you need. （宾语） 三、As引导的非限定性定从句
定语从句用法归纳
定语从句用法归纳 定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导，但须记住： 1.what不能引导定语从句. 2.关系词的分析须考虑它在定语从句中的成分。 一.指人的关系代词有who、whose、whom、that. 试分析： the old man who/whom /that we visited yesterday is a famous artist. miss wang is taking care of the child whose parents have gone to beijing . the man with whom my father shook hands just now is our headmaster. （=the man who/whom that my father shook hands with just now is our headmaster.） 注： ?指人时有时只用who不宜用that。 1．先行词为one、ones或anyone （1）the comrade i want to learn from is the one who studies hard and works hard. （2）anyone who breaks the law should be punished. 2．先行词为these时 these who are going to beijing are the best students of our school. 3．在there be 开头的句子中 there is a student who wants to see you. 4．一个句子中带有两个定语从句，其中一个定语从句的关系代词是that，另一个宜用who，以免重复。 the student that won the first prize is the monitor who works hards. 5．在非限制性定语从句中 i met a friend of mine in the street, who had just come from japan. b．主句以who开头的句子中,只用that,不用who。 二．指物的关系代词有which、whose(=of which)、that. 试分析： 1.i like the books which / that were written by lu xun. 2.the desks (which/that) we made last year were very good. 3.this is the house in which we lived last year. (= this is the house which /that we lived in last year.) 4.i live in the room whose windows face south. (= i live in the room ,the windows of which face south.) 注： a. 介词如果位于作为其宾语的关系代词之前时，只能用whom、which不能用who或that. (1). the girl about whom they were talking is our monitor. (2). the book in which there are many interesting things was written by li ming. b. 部分短语动词中的介词不可与动词拆开，在定语从句中其介词不可前置，只能放在其动词后。 is this the book which she is looking for? the old man who/whom they are waiting for is professor li. the child who/whom she is looking after is wang ping’s son. c．指物时，下列情况下只能用that ，不宜用which。 （1）先行词为不定代词，如all、much、anything、everything、nothing、something、none、the one等。
(完整版)定语从句as的用法
as 引导定于从句： 1、as用作关系代词和关系副词引导限定性定语从句，并在从句中做主语、表语和状语，构成the same ...as, such...as等结构。 Eg: I have got into the same trouble as you. 2、as引出非限定性定语从句时，代替整个主句，对其进行说明。但通常用于：（as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper) . as在非限定性定语从句中作主语、表语或宾语，且引出的从句位置比较灵活，可位于句首或句末，也可置于主句中间。通常均由逗号将其与主句隔开。 as有“正如……，就像……”之意。 Eg: As is known to the United States, Mark Twain is a great American writer. 美国人都知道,马克·吐温是一位伟大的美国作家（as在从句中作主语）He forgot to bring his pen with him, as was often the case. 他忘了带笔，这是常事。（as在从句中作主语） He is absorbed in work, as he often was. 他正在全神贯注地工作，他过去经常这样。（as在从句中作表语）As we all know, the earth is round. 众所周知，地球是圆的。（as在从句中作宾语）
As引导各种从句归纳
As引导的从句 一、As引导让步状语从句 为了帮助同学们全面掌握让步状语从句的倒装 用法，本文将这类语法现象归纳为以下五种句型： 1、名词+ as / though +主语+动词 King as he was，he was unhappy. 他虽是国王，但他并不幸福。 Child as he is，he knows to help other. 他虽是个孩子，却知道帮助别人。 【说明】其中的动词通常为连系动词，也就是说位于句首的名词是其后连系动词的表语。另外，要特别注意位于句首的名词前习惯上不用冠词，即使其前有形容词修饰也不用冠词。比较： Boy as ［though］he is，he likes to play with girls.=Though he is a boy，he likes to play with girls. 他虽是男孩，却喜欢与女孩子玩。 Strong man as ［though］he is，General Botha has been severely put to the test during the
past few weeks.= Though he is a strong man，General Botha has been severely put to the test during the past few weeks. 波赛将军虽然坚强，但在过去的数周里也受到了严峻的考验。 2、形容词+ as / though + 主语+ 动词 Successful as he is，he is not proud. 他虽然成功，但不骄傲。 Improbable as it seems，it’s true. 虽然看起来不太可能，但却是真的。 Stupid as it sounds，I was so in love with her that I believed her. 尽管听起来很愚蠢，我是如此爱她竟然相信了她的话。 Patient as he was，he didn’t like waiting that long. 他虽说有耐心，也不愿等这么长。 Beautiful though the necklace was，we thought it was over-priced. 那条项链虽然很漂亮，我们认为价钱太高。
as引导定语从句时的特殊用法
as引导定语从句时的特殊用法 关系代词as既可以引导限制性定语从句，也可以引导非限制性定语从句。as可以在从句中作主语、宾语或表语。 1. as引导限制性定语从句 as引导限制性定语从句，置于先行词之后，与其词义关系密切，不可分割。如： He is such a good boy as everyone likes.他是大家都喜欢的好孩子。 Such machines as are used in our workshop are made in China.我们车间使用的机器是中国制造的。 as 常见搭配： 1） such+（不定冠词+）名词+as引导的定语从句，意思是“像……一样的”。如： The little boy realized that there was no such a tank as he dreamed of after he got to the museum. 那个小男孩儿到了博物馆后才知道没有他所想象的那种坦克。 2） the same+名词+as引导的定语从句，意思是“同一类事/物”。如： Lao Li bought the same computer as I did. 老李买的电脑跟我买的一模一样。 1. as引导非限制性定语从句
as引导的非限制性定语从句，既可以放在主语之前，也可以放在主语之后。通常用于下列句型：as is know to all，as is said，as is reported，as is announced，as we know，as I expected 如： As I expected, he got the first place again in this mid-term examination. 正如我所预料的那样，他在这次期中考试中又得了第一名。 2. as引导非限制性定语从句时与which的区别 1） 当非限制性定语从句置于主语之前时，只能用as。如： As is known to us, the moon travels round the earth. 2） 从句置于主语之后，且从句有否定词或表示否定意义时，只能用which。如： Tom was late for school this morning, which was unexpected. 汤姆今天迟到了，这让人觉得意外。 He drinks a lot every day, which his wife doesn’t like at all. 每天他都喝很多酒，他的妻子一点都不喜欢他这样。 3) 非限定性定语从句中出现expect , think , suppose 等表示猜测、想象、预料等时，只能用as She succeeded in her doing the research work , as we expected . 4)固定搭配：such/the same+as Exercises: 1.The British are not familiar with different cultures and other ways of doing things, ________is often the case in other countries. A) as B) what C) so D) that
as的用法总结
㈠、so that、so…that、such that、such…that引导状语从句的区别。so that 作为一个整体，充当一个连词引导状语从句，其前的主句完整。such that好像大多情况下跟在系动词后面，such可以理解为作系动词的表语，而that引出状语从句。 例：The difference is such that all will perceive it. I did very well in English so that I was praised by Miss Green. so…that 、such…that中so是副词，修饰后面的副词性、动词、形容词性的成分。such是形容词，修饰名词性成分。连词that引出状语从句。例：He is so honest that he will not tell a lie. ㈡、as 引导的定语从句，用在如下句型中：(先行词可是人或物) ①“as/so…as”，此结构中，第一个as或so它们都是副词，修饰主句的形容词或副词的原形，后一个as是关系代词，引导限制性定语从句。 例：In the city, I saw so grand a National Day celebration as I never dreamt of.(本句中so修饰形容词grand，as作为关系代词引导定语从句且在从句中作of的宾语。) ②such…as(这个句型中，such是代词，作名词的定语，修饰其后的名词，as是关系代词，参见《大学英语语法》P120)，“such as”连用这种结构与分开的结构式一样的，只是把such与as放在一起而已。Such people as were recommended by him were reliable.（such作people 的定语，as引导定语从句，在从句中作主语，先行词为people。） I’ve never seen such a talented young man as he is.(such作a man的定
as引导的定语从句
"As”可以用作关系代词引导定语从句。 一：as可以代替整个句子或一件事，引导非限制性定语从句，在从句中作主语、宾语或表语，意为“正如……，就像……，据……”；从句位置可置于主句之前或之后，有时也可作为插入语置于句中，一般用逗号和主句隔开。 as的这种用法常见于以下这些结构:as we can see, as can be seen, as we know, as is （well） known,as may be imagined,as often happens,as has been said before,as was mentioned above,as is often the case,as/indeed it is,etc. 多看一些例句:As is well known，great changes have taken place in China.or:Great changes,as is well known,have taken place in China.众所周知，中国发生了巨大的变化。( as在定语从句中作主语。) This experiment is very simple，as indeed it is.实验非常简单，事实上也确实如此。(as在定语从句中作表语。) 注意：① which在引导非限制性定语从句时，也有和as一样的功能，可以代替整个句子，但which只能用在主句之后。 ②在as所引导的非限制性定语从句中，如果运用的是被动语态结构，be动词可以省略；但which没有此用法，be动词不可省。例如:She married him，which was unexpected.＝She married him as（was） unexpected.她嫁给了她，这一点大家都没有料到。（作主语，代替前面的句子；用which时was不可省。） 二 as除了代替整个句子，也可以代替主句中一个特定的词。as在它引导的定语从句（限制性或非限制性）中可以充当主语，宾语和表语；在这种用法中它经常和such, so, the same 等词搭配使用；且当先行词中有such, so, the same等词修饰时，关系代词通常必须用as。
as的用法总结
as的用法总结 as是英语考试中用得比较多的一个词，也是很多学生反映较难掌握的一个词。as的词性较多，用法也较复杂，因此掌握该词会对英语学习很有帮助。下面笔者就对as的用法作一个简单的归纳。 一、as作为从属连词，可以引导下列从句： 1、as引导时间状语从句，意为“正当……的时候”、“一面……一面……”、“随着……”，从句可放主句之前或主句之后。 As I was coming here, I met your brother. As he walked on, he felt himself getting more and more tired. 【知识拓展】：as与when, while都是引导时间状语从句的从属连词，含义都是"当……的时候"。但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。例如： It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。 He was watching TV while his mother was cooking.他母亲做饭时他在看电视。 You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。 2、as引导原因状语从句，意为“由于”大多位于主句之前，偶尔在前或后。 As this question is of great importance, we will discuss it once again. Water, as it occurs in nature, is never very pure. We couldn‘t send the children to school as life was very hard in those days.【知识拓展】：as, because, since都可以表示因果关系，连接原因状语从句，含义是“因为，由于”，但它们有区别：because表示的语气最强；as 一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作“既然”。例如： He will succeed because he is in earnest.他一定会成功，因为他很认真。 Since you are so sure of it he’ll believe you.既然你对此如此有把握，他会相信你的。 As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。 3、方式状语从句，意为“如同”、“按照……的方式、样子、办法”。As 从句总跟在主句之后。 You must try to hold the tool as I do. 象我那样拿住工具。 Leave things as they are. 让那些东西保持原样。 3、as引导让步状语从句，意为“虽然”，多在主句之前，且多用倒装。（应将从句主要成分的形容词、副词、原形动词、不加冠词的单数名词
as在定语从句中的详细用法
as引导的定语从句 (1) as引导的定语从句修饰表人或物的先行词，即先行词可以是人也可以是物；在定语从句中可以做主语、宾语或表语；常用于the same…as…/such…as…/as(so)…as…句型，as不论在定语从句中作何成分，均不能省略。 ①Such teachers as know Tom think him bright. 先行词为人such teachers，as作主语 ②I’ll buy the same bike as I lost yesterday. 先行词为物the same bike，as作宾语,指同一类事物 ※此时注意和the same …that …引导的定语从句的区别 It’s the same bike that I lost yesterday. that引导定语从句，作宾语，指同一个事物 ※She wore the same dress that she wore at Mary's wedding. (the same…that…特指同一个) 她穿着她在Mary婚礼上穿过的同一条裙子。 She wore the same dress as her young sister wore. (the same…as …泛指同一类) 她穿着和她妹妹所穿的一样的裙子。 That is the same watch as I lost. 那块手表和我丢失的一模一样。(the same…as …泛指同一类) That is the same watch that I lost. 那就是我丢失的那块手表。(the same…that…特指同一个) ③The school is just the same one as it was 10 years ago. 先行词为物the same one (school), as作表语 It’s so heavy a box as no one can lift. 先行词为物so heavy a box，as作宾语 此时应注意as引导的定语从句和结果状语从句such / so…that…的区分 It’s so heavy a box that no one can lift it. 结果状语从句so…that…如此…以至于… ※He is such a good student as is liked by everyone. (定语从句，as在从句中作主语) He is such a good student that he is liked by everyone. （结果状语从句such…that…）that在从句中不充当任何成分，故不是定语从句，而是结果状语从句 (2) as引导的非限制性定语从句可以修饰整个主句, 可以放在主句前，主句后或插入主句中间。此时as含有“正如…”之意。常用的as引导的非限制性定语从句固定表达有： as we all know / as everyone knows / as is known to all / as is well-known (众所周知)/ as I can remember(正如我所记得的) / as we expect / as was expected (正如预料的那样)/ as often happens / as we all can see / as can be seen / as has been said before (如前所述)… As everyone knows, Shakespeare is a famous writer. Shakespeare is a famous writer, as everyone knows. Shakespeare, as everyone knows , is a famous writer. (3)注意which引导的非限制性定语从句也可以修饰整个主句, 但不能放在主句前，常译为“这一点、这件事…”。 She is working hard, which everyone can see. which引导的非限制性定语从句不能放在主句前 She is working hard, as everyone can see.﹦As everyone can see, She is working hard. (4)注意当修饰整个主句时，as引导的非限制性定语从句含“正如”之意，因此在意义上不能和主句相抵触；which引导的非限制性定语从句则无此限制。如： Our team lost the game, which was unexpected. 我们的球队输了比赛，这一点是未预料到的。此时不 能用as。 Our team won the game, as was expected. 我们的球队赢了比赛，正如预料的那样。
as和which的用法区别
■as 和which的相同点 (1) as 和which都可引导非限制性定语从句，放在主句之后；在非限制性定语从句中充当从句的主语、宾语或表语。如： Tom has found a good job, as / which we all hope. 汤姆找到了一件好工作，这正是我们大家所希望的。 (2) as 和which都可代表整个句子的内容或主句中的某一成分。如： His mother is ill, which makes him very sad. 他母亲病了，这件事情使他很难过。 He has made great progress, as / which makes us very happy. 他进步了，这使得我们很高兴。 以上两句中的as / which都指前面整个句子的内容。 Though he has lots of money, he still rides his old bike, which was bought ten years ago. 尽管他很有钱，但是他还骑着他的旧单车，这单车是十年前买的。 There you can meet many writers as you have ever read in books. 在那里，你可见到你在书中所读过的很多作家。 ■as与which的区别 (1) 当先行词前面有so + adj. + a / such + (a) + adj. , the same等词修饰时，引导词只能用as，而不用which。如： She is so nice a girl as we all like. 她是个我们大家都喜欢的如此好的女孩。 It is such an interesting book as we all want to read. 它是本我们大家都想读的有趣的书。 上面两句中的as就不能用which替换。 (2) as 在从句中常作宾语；作主语时，从句的谓语动词常为系动词，即：系表结构或被动结构。如： As is said above, he has conquered the difficulty. 正如上面所说，他征服了困难。 (3) 当非限制性定语从句放到主句的前面时，引导词只能用as，而不用which。如：