as和which引导定语从句的异同
高中英语 知识点大全13 aswhich引导定语从句异同
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 which在定语从句中 区别
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。
as_which引导定语从句的区别
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的区别
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 引导定语从句的异同
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
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
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。
as和which引导定语从句的区别
1）关系代词在非限定性定语从句中代替主句中某一个名词或词组，并对该名词或词组进行补充或说明时，只能用which.The book, which I bought yesterday, is very interesting.Last night, I saw a film, which was about Long March.2)关系词在非限定性定语从句中代表主句中谓语部分的整个概念的只能用which.He can write a letter in English, which I can not.I asked him to lend me his bike, which he did.3) 关系词在非限制性定从中代表主句所表达的整个内容，并当关系词等于and this时，只能用which.The stems of bamboo are hollow, which makes them very light.It was raining hard, which kept us indoors.4) 关系词在非限制性定从中代表主句所表达的整个内容,并关系词等于which fact时，只能用asThis elephant is like a snake, as anybody can see.He came very early this morning, as was usual.5) 关系代词所引导的非限定性定从放在主句之前时，只能用as.As we all know, Taiwan is a part of China.6) 非限定性定从的谓语为say, know, imagine, announce, show, report, expect, explain, point out等动词的被动形式时，只能用as.He is a famous scientist, as is well known.As is announced in today’s newspaper, American president will pay a visit to China.7) 关系词在非限定性定从中代表主句中的表语意思，并在从句中作表语时，只能用as. This question is very simple, as indeed it is.This question is quite easy, as are all of the questions in the following.8) 如果定语从句的内容对主句有消极作用或含义不一致，则从句用which引导，如果语义一致时，则常用as引导。
定语从句中as与which的区别
定语从句中as与which的区别定语从句中as 与 which的区别今天Master Osifu 将为大家讲一下定语从句中as 与 which的区别，查阅过大量的语法书籍，发现讲述这两个词的用法篇幅很长，让人眼花缭乱。
事实上，在实战教学应用中，没有那么复杂，Master Osifu 研究过历年的高考真题，真正考试中，考这个知识点的时候很少，一般出现在模拟考试中居多。
下面让我们一起来分析这两个词的异同点。
1.as 与which的共同点：在定语从句中都可以做主语或宾语成分，其先行词可以是指单个的词也可以是整个句子，在这时候，两个引导词都可以使用。
例如：①.He was late for school, as/ which was usual with him. 他上学迟到，这是家常便饭。
分析：此处的定语从句引导词as/ which在从句中做主语成分，指代的先行词是前面整个句子。
②. I live a long way from work, as /which you kow. 我离上班的地方很远，这你是知道的。
分析：此处的定语从句引导词as/ which在从句中做宾语成分，指代的先行词是前面整个句子。
2. 接下来主要讲as/ which的几个不同点：①.as的位置灵活，可以位于句首、句中，但which只能位于句中。
②.as 的用法比较固定，一般有这样的搭配，如 as is known to sb, as is often the case, as is expected/ reported等，有“正如”之意，as 后的动词通常为系动词或动词的被动语态形式。
下面我们还是用例句来理解更直白清晰：1.___ is often the case, Tom didn’t study hard and failed to pass his math test.A. ItB. WhichC. ThatD. As解析：答案 D。
(已发)关系代词as与which引导定语从句异同点
关系代词as与which引导定语从句异同点1.as只能用来引导非限制性定语从句，不能用来引导限制性定语从句；而which不仅可以引导限制性定语从句，也可引导非限制性定语从句。
eg:① The sports meeting which was held last month was a success.也可以说：The sports meeting，which was held last month，was a success.②The sports meeting was a success，as was expected by us.而不能说：The sports meeting was a success as was expected by us.2.as引导的定语从句可放于句首，也可放于句末；而which引导的定语从句只能放于句末。
eg:① He is a good student ,as is known to us .也可以说：As is known to us, he is a good student.② He was late for school again ,which is often the case.不能说：Which is often the case，He was late for school again.3. as引导的定语从句只能用来指代一句子，而which引导的定语从句不仅可以指代一个句子，也可指代单个的名词。
eg:① The thing which I met her in the park yesterday is true.(修饰单个的名词只能用which,不能用as)② He said that he had lost the book ,which/as is untrue.4.若主从句内容不一致，或者从句对主句内容起反对、排斥、否定等作用，或定语从句带有宾语补足语时，多用which。
As和which在引导定语从句时的区别
As和which在引导定语从句时的区别以下是小编给大家整理的As和which在引导定语从句时的区别，希望可以帮到大家第一、在限制性定语从句中的区别：as 的用法：其通常和such\ the same连用，代指物在从句中做主语或宾语This is the same pen as I bought yesterday。
这种笔和我昨天买的笔一样(同样的但不是同一个)。
引导定语从句的关系词在从句中做宾语，因先行词被the same所修饰所以用as引导注意：上句与下句的区别 This is the same pen that I used yesterday.这就是昨天我使用的那一支钢笔(指的是同一个)。
I studied in the same school as she did in Beijing.我和他在北京的同一所学校就读。
引导定语从句的关系词在从句中做宾语，因先行词被the same所修饰所以用as引导I want to have such a dictionary as he has.我想要一本和他的一样的字典。
引导定语从句的关系词在从句中做宾语，因先行词被such所修饰所以用as 引导which的用法：关系代词，在从句中做主语或宾语，做宾语时通常可以省略(直接做介词的宾语时除外，不能省。
)The radio which he bought yesterday doesn't work now.他昨天买的收音机现在坏了。
引导定语从句的关系代词在从句中做宾语，代指物，故用which.Can you lend me the book which was written by Lun Xun..你能借我那本由鲁迅所写的书吗?引导定语从句的关系代词在从句中做主语，代指物，故用which.This is the park which is the most beautiful one in our city.这是我们这个城市最漂亮的公园。
as和which的异同
3）as和which的异同相同点：在非限制性定语从句中，均可替代整个主句或句中某个部分，在从句中作主语、宾语、表语。
如从句在主句之后，两者皆可用。
They failed in the exam,as /which is natural.She seems a scientist, as/which in fact she is .不同点：a 从句在主句之前用asAs we all know, his parents were killed in this war .b 表示顺从关系用as 表示转折、因果关系用whichHe has passed the exam, as we expect .He has passed the exam,which we don’t expect .Bamboo is hollow , which makes it light .c as后面多加系动词，which后面多加实义动词The earth travels around the sun , as is known to all .d Such…as/as…as /the s ame…asI have never heard such stories as he tells .The village is the same as it was four years ago .定语从句（2）二、关系副词Do you remember one afternoon ten years ago when I came to your house and borrowed a diamond necklace?The factory where his father works is in the west of the city.This is the reason why he was late for class.1定语从句中的关系词的选择原则：判断是用关系代词或是用关系副词，要看先行词在从句中所起的作用，当先行词是表时间、地点和原因的词时，一定要分析从句的结构，如果缺少主语和宾语时，关系词应该用which或that ，缺少时间、地点或原因状语时，才能用when、where 或why.A. This is the factory ____we worked.B. This is the factory ____we visited last year .A. I won’t forget the year ____ he studied in our school .B .I won’t forget the year ____ he spent in our school .A. The reason ____ he can’t come is that he is ill .B. The reason ____ he put forth is very important .三、介词加关系代词结构的用法1）名词+of which/whom结构，常常可以转化为whose+名词结构。
as和which引导的定语从句的区别
从山东一道高考题看as和which引导的定语从句区别as 引导的定语从句可以代替整个主句内容；which引导的定语从句可以代替整个主句，有时代替主句部分内容。
那么它们有什么区别呢？1）意义上的区别（此点是关键区别）as 往往翻译为“正如”；which往往翻译为“这一点”。
Mr. Lu committed suicide, which made the whole nation sad.He passed all the examinations, as we had expected.As 往往有一些相对固定的形式as we had expected, as we all know, as is known to us all, as is/was reported, as is often the case, as it turned out, as we can remember etc.He was late for work this morning, as is often the case.2) 位置上的区别which引导的定语从句，常常位于句末，有时位于句中，一般不能位于句首；as 引导的定语从句可以位于句首，句中，句末。
She married John, which surprised us all.Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.（09山东）A. whoB. whichC. whenD. thatAs we all know, the sun rises in the east and sets in the west.The sun rises in the east and sets in the west, as we all know.The sun, as we all know, rises in the east and sets in the west.小提示：Which 引导的定语从句，位于句首的情况，本人在英美人写的文章中看到过好几次。
which与as在定语从句中的不同用法
which与as在定语从句中的不同用法下面是小编整理的一些关于which与as在定语从句中的用法，希望帮助大家区分这两个单词。
提高英语水平。
which与as在定语从句中的不同用法一、which与as用法相同点1. as和which都能引导定语从句，并都可以在定语从句中做主语或宾语，代表前面整个句子。
例 1 He married her, as / which was natural. 他跟她结婚了，这是很自然的事。
例 2 He is honest, as we can see. 他很诚实，这一点我们看得出来。
(表示人们从日常主观常识, 经验对某一事情的看法、评价,用as为妥。
)2. 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。
例 3 The number of senior high school students is increasing, as is mentioned above. (as引导非限定性定语从句，意思是“正如”。
此时也可以换用which引导，但意思有别，意思是：“这一点上面提到了”。
)二、which与as用法不同点(一)语义上的区别as作为关系代词仍多少保留“理由”“比较” “方式” “等同”等意义，而which没有这些意义。
因此，由as引导的定语从句通常在意义上不可与主句相悖，而且一般是肯定的，对主句意义起相辅作用，表示“正如”等意义;而which引导从句则不受此限制。
例 4 Mother treats me just like a baby，which I can’t bear. 妈妈对我就像小孩，我真受不了。
例 5 She has married again，which was unexpected. 她又结婚了，这是大家没有预料到的。
上面两句中的which都不宜用as。
但当否定的定语从句作正面理解，对主句起相辅作用而不是与其相悖时，仍可用as。
as which 的区别
1、as与which的用法区别：(1)引导限制性定语从句时，在such,as,thesame后只能用as，其他情况用which：如：I never heard such stories as he tells. 我从未听过他讲那样的故事。
It's the same story as I heard yesterday. 这故事跟我昨天听到的一样。
This is the photo which shows my house. 这张照片拍的是我的住宅。
(2)引导非限制性定语从句时，有时两者可互换：如：I live a long way from work, as [which] you know. 我住得离工作单位很远，这你是知道的。
(3)但在，在以下情况引导非限制性定语从句时，两者不可换用：①当从句位于主句前面时，只用as：如：As is known to everybody, the moon travels round the earth once every month. 月球每月绕地球转一周，这是每个人都清楚的。
②as引导的非限制性定语从句应与主句在意义上和谐一致，which无此限制：如：He went abroad, as[which] was expected. 他出国了，这是大家预料到的。
He went abroad, which was unexpected. 他出国了，这让大家感到很意外。
(不用as)③as引导非限制性定语从句时，先行词通常不能是主句中某个具体的词，而应是整个句子、整个短语或某个短语推断出来的概念，而which则无此限制：如：The river, which flows through London, is called the Thames. 这条流经伦敦的河叫泰晤士河。
(不用as)④当as引导非限制性定语从句作主语时，其谓语通常应是连系动词，而不宜是其他动词，而which则无此限制：如：She has married again, as[which] seemed natural. 她又结婚了，这似乎很自常。
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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， 语，宾语或表语，位于主句之后有时可互换。
在从句中做主
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。
A. who
B. that
C. as
D. which
2. Jim passed the driving test, ____surprised everybody in the office.
A. which
B. thatຫໍສະໝຸດ C. thisD. it
3. The road conditions there turned out be very good, ____was more than we could expect.
（众所周知）
4. as 引导的定语从句只表示一个众所周知或意料之中的事，但
which 不受此限制。（即 as
引导的定语从句在意义上不是否定的。）
He married her, which was unexpected. 他和她结婚了，这是出乎意料的。 ( 不可用 as)
He failed in the experiment, which was unexpected.
He lifted so heavy a stone as no one else can lift.
He is so young a boy that he can
’ t go to school.
2.which 引导的定语从句只能位于主句后，但 as 引导的从句可位于主句前、中、后。 As is known to all, China is a developing country. He is from the south, as we can see from his accent. John, as you know, is a famous writer. Li Ming is late, as is often the case.
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 在定语从句中 lift 的宾语）
He has been to Paris more than several times, which I don
’ t believe.
3. as 有 “正如 …… ，正像 ……”的意思，而 which 则没有。常用的句型有：
as is often the case
(这是常有的事 )
as was expected
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 ，
I may have to work late, in which case I 我可能得晚点下班，那样我会给你打电话的。
’ ll telephone you.
The machine may be out of order, in which case it will be repaired at once.
她穿着她在玛丽婚礼上穿过的同一条连衣裙。（
that 指的是与先行词同一事物）
②定语从句 such/as …as… 与结果状语从句 such/as … that …的区别： as 在所引导的定 语从句中作主语，宾语； that 在结果状语从句中不做成分 He has such a good laptop as I want to buy. He has such a good laptop that I want to buy one.
注意： ①在 the same as结构中， as 也可用 that 代替。但严格地说， the same as强调相同， the
same that 注重同一。
She wore the same dress as her younger sister wore.
她穿着跟她妹妹所穿的一样的衣裙。（ as 指的是与先行词相似的同类事物） She wore the same dress that she wore at Mary's wedding.
1. The owner of the cinema needed to make a lot of improvements and employ more people to
keep it running, ____meant spending tens of thousands of pounds.
(不出所料 )
as often happens
(正如经常发生的那样 )
as has been said before
(如上所述 )
as is mentioned above
(正如上面所提到的 )
as everybody/we can see
（正如大家 / 我们所看到的）
as is known to all=as we all know