as和which引导定语从句的异同

高中英语知识点大全（13）：as/which引导定语从句异同1、as/which引导定语从句异同as/ which 都能引导限制性或非限制性的定语从句。

(1)在引导限制性定语从句时；①which从句修饰的先行词是名词（词组），which可与that换用，作宾语时可省去。

如：Then grow some tomatoes in one box which has plant food in the soil and some in another box which doesn’t.But the studios(which)he started are still busy today, producing more and more interesting films.②as从句的先行词是the same/such或被the same/such修饰；as可作主、宾、表语，一律不可省略。

如：Many of the sports were the same as they are now.（as作表语）He uses the same map as I (use).他和我用的是同一份地图。

（as作宾语）Such as beautiful park as is being built was designed by two young engineers.正在建造的如此漂亮的公园是由两个年轻的工程师设计的。

（as作主语）The printed newspaper was not such as the chief editor had expected. 印好的报纸并非如主编原来所期望的那样。

（as作宾语）(2)在引导非限制性定语从句时，as,which都可作主、宾、表语，都不可省去。

①which从句补充说明先行词的用途、性质、状态、特征等。

如：At present,the biggest nature park for milu deer in China is in the Nanhaizi Milu Park,which is about 20 kilometres south of Beijing.(位置)China Daily has plenty of advertisements, which help to cut the costs of making the newspaper.(用途)One of Charile Chaplin’s most famous films was“The Gold Rush”,which was made in 1925.(时间)Now, however,the maters of this great lake,which is also the World’s deepest(over 1,740 metres),have been dirtied by waste from a chemical factory.(特征)②which从句还可表示说话人的看法，也可对主句作意义上的补充；which=and it/ this/ that/ they;which代表的是先行词、主句或主句的一部分；which从句只能放在先行词或主句后。

非限制性定语从句which和as的用法汇总一篇非限制性定语从句which和as的用法 1非限制性定语从句which和as的用法一、相同之处当从句位于主句之后，引导词指代整个主句所表达的全部意义时，as 和which可以互换。

如：The elephant is like a snake,as/which everybody can see.大家都看得出，这头大象像条蛇。

A big earthquake occurred there last night,as/which was reported on TV.据电视报道，昨夜那里发生了大地震。

She is from Shanghai,as/which I know from her accent.她来自上海，那是我从她的口音知道的。

二、不同之处1、as引导非限制性定语从句时，位置比较灵活，可位于主句之前，也可位于主句之中或之后;而which引导非限制定语从句只能位于主句之后，不能位于主句之前。

如：_______ is known to everybody,the moon travels round the earth.A.ItB.AsC.ThatD.Which答案：B_______ is mentioned above,the number of the students in senior highschools is increasing.A.WhichB.AsC.ThatD.It答案：BAir,as we know,is a gas.众所周知，空气是一种气体。

He is very careful,as his work shows.他的工作表现表明他非常谨慎。

as引导非限制性定语从句常有“如同.那样”的含义，因此在一些固定结构中，如：as we know;as is known to all(众所周知)as we all can see(正如我们大家都能看到的那样)as has been said before/above(正如前面所述)as might be imagined(可以想象得到)as might be expected(正如所预料的那样)as is often the case(情况通常是这样)以上种种固定搭配，一般不能用which代替as。

as和which引导定语从句的区别as和which引导定语从句的区别导语：As 和which都可以引导非限定性定语从句，在用法上有一些区别。

欢迎阅读！1.as 和which都可以在定语从句中作主语，宾语，既可修饰一个词也可修饰前面的整个句子。

A.She accepted his proposal, as(which)was natural.她接受了她的求婚，这是自然而然的。

B.The boy is pretty handsome, as(which)we can see in our classroom.这个男孩非常的帅气，正如我们在教室看到。

2.as 在非限定性定语从句中的使用2.1 as可以放在主句之前，主句之后，也可以放在句中，可以说位置很灵活。

但是which常用在主句之后A.As we know,technology just like a engine to push the development of economics.众所周知，技术就像是引擎推动着经济的'发展。

B.The diva,as you know, is famous throughoutthe world.这个女歌剧演唱家，正如你知道的，在全世界都出名。

C.He has stood her up, which I don`t believe.他没有赴约，这事我不相信。

2.2 as与the same，such 连用时，用as。

A.This is the same phone as I have borrowed from my sister.这个手机和我向我姐姐借的一样。

B.I have never had such a chance to make a speech as I always imagined.我从没有这样一个机会去演讲，正如我一直想象的那样。

2.3在从句中谓语动词为被动语态，缺少主语时用as，不用which。

as和which引导非限制性定语从句的区别1.as引导的非限制性定语从句1)位置灵活，可以置于主句的句首、句中或句末；2)先行词不可是一个词，必须是整个主句或主句的部分内容；3)有“正如、像”等意思，表依据、评论（、态度、看法）等；如：a.This elephant is like a snake，as anybody can see．像任何人都能看见那样，这头象像条蛇。

b.He failed in the exam, as we had expected.c.Tom has passed the test, as everybody knows.正如每个人所了解的那样，汤姆通过了考试。

【比较：Bamboo is hollow，which makes it very light．竹子是空的，这就使得它很轻。

】4)常用以下谓语动词的主、被动语态：know, see, say, expect, imagine, hope, believe,announc e, suggest, report, point out…,例：a.主动（做宾）：as we all know, as you know,as everybody knows;as you see, as wecan see,as we have seen, as anybody can see; as was expected; as we canimagine,as we have imagined…a)As we all know, the earth is round.b)He was a foreigner, as I know from his accent.c)Mike, as we expected, attended the meeting．像我们所期望的那样，迈克参加了会议。

b.被动（做主）：as is known to everybody,as is known to all; as has been expected;as is often the case (with …)，as has been pointed out, as is usual with, as isreported in the newspaper…a)He is an honest man, as is known to all.b)As is often the case with young people, he was overconfident.c)He wasn't unconscious，as could be judged from his eyes．他并未失去知觉，这从他的眼神可以判断出来。

众所周知，which与as都可以引导定语从句，但它们有许多用法上的区别，现就此简要分析如下：一、which与as引导非限制性定语从句的区别：1．Which只能放在主句后面，而as引导的从句位置相对较灵活，可在前，可在中，也可在后。

例如：A) As he realized, I was very useful to him.(在前)B) Air, as we know, is a gas.（在中）C) He was a foreigner,as I know from his accent.(在后)2.在which引导的定语从句中，谓语动词若是am, is, are则这些系动词不能省略；而as后面若是这种情况，则可以省略。

例如：A) He is a teacher, as (is) clear from his manner.(is可以省略)B) He said he had never seen her before, which was not true.(was 不可省略)3.当which引导的从句在意义上近乎并列关系时，可以用and this，and that 代替，意思是“这件事”例如：A) He changed his mind, which(and this, and that)made me very angry.他改变了主意，这使我很生气。

B) She has married again, which(=and this, and that)was unexpected.出乎意料的是，她又结婚了。

而as主要起与上下文连接的作用，表达说话人的看法、观点，并指出主句内容的出处或根据等，例如：C）Einstein, as we know, is a famous scientist.爱因斯坦，众所周知，是位伟大的科学家。

D）As is announced in today’s newspaper, we must improve our style of work.今天的报纸上说，我们必须改进工作作风。

关系代词as与which引导的非限制性定语从句，其先行词都可以是整个主句，指代主句的整个意思。

但as和which具有不同的词义、句法和用法。

1. as引导的从句表示说话人的看法、态度、解释或评论引导定语从句时，as仍具有“正如，像，由……可知”等意思，翻译时有时可不必译出。

as定语从句常含有这些动词：see, know, hear, watch, remember, say, tell, show, expect, guess等，这类动词与as连用几乎成了一种固定搭配。

as引导的此类从句可以置于句首、句中或句尾。

如：The famous magician Liu Qian, as we all know, is from Taiwan. 众所周知，著名魔术师刘谦是台湾人。

There is a net bar around here, as I remember. 我记得这儿附近有一家网吧。

As is often the case, girls like dolls while boys like guns. 女孩子喜欢玩具而男孩子喜欢枪，这是常见的情况。

2. which引导的从句对主句所叙述的事情进行补充说明，表明事物的状态或结果which此时指前面主句所提到的这件事，常译为“这一点，这件事”等。

这时它所引导的从句与主句之间常含有并列、因果关系。

注意，它引导的从句不像as那样位置灵活，它只能位于主句的后面。

如：He changed his mind again, which made us all angry. 他又改变了主意，这使我们大家都生气了。

She tore up my photos, which (=and that) upset me.她撕碎了我的照片，这使我很不安。

3. 在从句中作定语或介词的宾语时，要用which，不用asJenny might come, in which case I'll ask her. 詹妮可能会来，要是那样的话我就去问她。

as 和which 引导定语从句的区别一、相同点：两者引导非限制性定语从句时，可指代主句中的部分或整个句子的内容，在从句中做主语，宾语或表语，位于主句之后有时可互换。

The meeting was put off, as /which was exactly what we wanted.He was a doctor, as/which I knew from his manner.注：which 代表整个句子，还可用于in which case, at which point, on which occasion等。

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。

The machine may be out of order, in which case it will be repaired at once.Ten years of hard work changed her greatly, for which reason he could hardly recognize her at first sight.二、不同点：1. 在限制性定语从句中，当先行词被the same, such ,as ,so修饰时，要用as代替who，whom，which 或者that引导定语从句。

Such men as heard him were deeply moved.听过他说话的人，都会深受感动。

（as在定语从句中作heard的主语）I've never heard such stories as he tells.我从未听过像他讲的这样的故事。

（as在定语从句中作tell的宾语）He lifted so heavy a stone as no one else can lift.他搬起别人都搬不起的大石头。

as与which引导定语从句的用法辨析一、as和which都能引导的定语从句当非限定性定语从句置于句末时，as和which都可用来引导这个定语从句。

二、只能用which引导的定语从句1. 在限定性定语从句中。

2. “介词+关系代词”引导定语从句时，只能用which。

3. 当后置的非限定性定语从句是否定结构时，只能用which引导。

三、只能用as引导的非限定性定语从句1. 置于句首时，非限定性定语从句只能用as引导。

2. 在the same...as 结构中，意思是“像……那样的”。

3. 在as...as结构中，意思是“像……那样的”。

as作从属连词用时，可以引导五种状语从句。

现归纳如下：1. as表示“当……的时候”，引导时间状语从句，多强调主句和从句中的动作或状态同时发生，从句可放在主句前，也可放在主句后。

例如：As I waited at the stop，I heard a big noise.She rose up as he entered.2. as表示“因为”、“由于”，引导原因状语从句，其语气不如because强，通常为附加说明的理由，且是已知晓的原因，主句与从句没有逻辑上的因果关系。

例如：As she was not well, I went there alone.As he is a tailor, he knows what to do with this material.3. as表示“虽然……但是……”，引导让步状语从句，从句通常用倒装语序，把从句的表语、状语或动词原形放在as前面，可以用though替代。

例如：Child as he is, he knows a lot. Hard as it was raining，they went on working in the field.4. as表示“按照”、“依照”、“像”，引导方式状语从句，从句置于主句之后。

例如：You should do as the teacher tells you.The absence of air also explains why the stars do not seem to twinkle in space as they do from the earth.5. as表示“像……一样”，引导比较状语从句，对主句和从句的动作或状态加以比较，说明它们之间有相似之处，在从句中常省略与主句相同的部分。

which与as引导定语从句的区别之谈常见的定语从句引导词一般为关系代词：who,whom,whose,which,that 和关系副词：when,why,where. 而作为比较另类的as用作关系代词和关系副词引导的定语从句，有时候就被大家忽略了。

众所周知，which与as都可以引导定语从句，但它们有许多用法上的区别，现就此简要分析如下：一、which与as引导非限制性定语从句的区别：1.Which只能放在主句后面，而as引导的从句位置相对较灵活，可在前，可在中，也可在后。

例如：A）As he realized, I was very useful to him.（在前）B）Air, as we know, is a gas.（在中）C）He was a foreigner, as I know from his accent.（在后）2.在which引导的定语从句中，谓语动词若是am, is, are则这些系动词不能省略；而as 后面若是这种情况，则可以省略。

例如：A）He is a teacher, as （is）clear from his manner.（is可以省略）B）He said he had never seen her before, which was not true.（was不可省略）3.当which引导的从句在意义上近乎并列关系时，可以用and this，and that代替，意思是“这件事”例如：A）He changed his mind, which（and this, and that）made me very angry.他改变了主意，这使我很生气。

B）She has married again, which（=and this, and that）was unexpected.出乎意料的是，她又结婚了。

而as主要起与上下文连接的作用，表达说话人的看法、观点，并指出主句内容的出处或根据等，例如：C）Einstein, as we know, is a famous scientist.爱因斯坦，众所周知，是位伟大的科学家。

as与which在定语从句中的异同点总结■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。