英语中关系代词which和as的区别
as 和 which 的 区别
as 和which 的区别as 和which 都可用作关系代词来引导从句，它们两个到底有什么不同呢，这是同学们经常觉得困惑的地方。
下面详细讲讲它们之间的联系和区别，希望能解开大家心中的结。
一、as, which 指代整个句子或短语。
由as, which 引导的非限定性定语从句，相当于and this或and that。
在很多时候，表示说话人对话语的看法或态度，此时它们的先行词并不是具体的某个词，而是整个句子或短语：The Chinese government has decided to develop the west of China, which, I dare say, will benefit the people there, especially those who are still leading a poor life. 中国政府决定开发西部，我敢说，这将造福于西部的人民，特别是那些至今过着贫穷生活的人。
She has married again，which delighted us.她又结婚了，这使我们很高兴。
John said he’ d been working in the office for an hour，which was true.The result of the experiment was very good，which we hadn’t expected.Carol said the work would be done by October，which personally I doubt very much.二、as, which 用在句末的时候，有些情况下可以互换使用。
He was late for school，as/which was usual with him.他上学迟到，这是家常便饭。
He was a foreigner，as/which I knew from his accent.他是个外国人，我从他的口音中得知这一点。
定语从句中关系代词as与which的用法
学法新探关系代词as与which在定语从句中有时可以相互替换，但又有不同之处，稍不留心，极易使用不当，出现差错。
对此，笔者剖析了关系代词as与which在定语从句中的用法，以期能够帮助同学们准确把握和运用。
一、关系代词as与which在限制性定语从句中的用法关系代词as、which均可以用于限制性定语从句中，有时可以相互替换，但两者仍有着一定的差异，具体体现在：（1）当定语从句中的先行词为某物，且先行词前面有so,such,the same，as many/much等修饰语时，则只能用as引导限制性定语从句，不能用which引导。
比如：①It’s the same book as I bought yesterday.这本书和我昨天买的一样。
（不能用which代替as）②HongKong is so prosperous a city as is referred to as a shop-ping paradise.香港是一个繁荣的城市，被称为购物天堂。
(不能用which代替as)③These housed are sold atsuch a low price as people expected.这些房子按人们预料的那样低价出售了。
(不能用which代替as)（2）当先行词是表示某物的名词或代词时，且在从句中又做介词宾语时，则不可以用as引导限制性定语从句，只能用which引导限制性定语从句。
如：①Thisis the good car on which I spent all my money.这是我花了所有钱买的那辆好车。
（不能用as代替which）③This is the knife with which we cut the bread.这是我们切面包用的刀。
（不能用as代替which）③There is amountain of which the top is always covered with snow.有一座山顶总是覆盖着雪的山。
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。
定语从句中关系代词 as, which的区别
关系代词as, which的区别
5.从句内容为否定意义时，常用which： The young lady married an old man with a lot of money， which is disgraceful（不光彩的）. 6.如从句中行为动词是含有复合宾语结构，一般 要用which作主语： Tom has made great progress, which mቤተ መጻሕፍቲ ባይዱde us happy.
定语从句中关系代词 as, which的区别
关系代词as, which的区别
1.放句首或句中引导从句，只能用as; 从句在句末，无其他限制条件时，既可用 which，也可用as。 句型模式为：as …,主语＋ 谓语； 主语， as…， 谓语； 主语＋ 谓语，as/which… 2.当从句和主句语义一致时，用as，反之则用 which: She has married again, as was expected. She has married again, which was unexpected.
关系代词as, which的区别
[备注] (1)the same ...as ...表示相似的东西 the same ...that ...表示同一人或物 This is the same knife as I lost. 这把小刀和我丢的那把一样。 This is the same knife that I lost. 这把小刀就是我丢的那一把。 （2）such ...as 像……那样(定语从句) so/such ...that 如此……以至于…… (结 果状语从句)
关系代词as, which的区别
4.固定搭配：
在引导词＋be ＋done 结构中省略be时，只能 用as： The material resists heat （耐热），as shown in the experiment. 常见固定用法as is well known, as is often the case, as often happens, as has been said before, as has been pointed out, as can be seen等常用as，意为“正如” ： The air show（航空展 ） being held in Zhuhai is fantastic, as can be seen. It never rains but pours in this area, as is often the case.
非限制性定语从句中的关系代词which和as用法辨析
龙源期刊网 非限制性定语从句中的关系代词which和as用法辨析作者：邵玉金来源：《新高考·高三英语》2013年第03期请看下面两道题：① He has won the game， was expected.② He has won the game， was unexpected.A. thatB. whichC. itD. as以上两题选项中均含有关系代词which和as，该选哪一个呢？现就以下几个方面来谈一谈它们的区别（本文所谈的which和as是指引导非限制性定语从句中的关系代词which和as）。
一、位置关系：关系代词which不能放在句首；关系代词as 既可以放在句首也可以放在句末，甚至还可以放在句中。
1. As is known to all， he studies very hard.（不可用which）2. New concept English is intended for foreign students， which is known to all of us.（which不可放在句首，这里也可以用as）3. He， as you know， is clever.二、内涵关系：as有“正如”、“就像”之意，即主从句意义一致；which 则没有此意。
He is a foreigner from North America， as I know from his accent. （as表示“正如”之意）Tom is so busy that he has to work at weekends，which he doesn’t like.三、先后关系：as引导的多为经常性行为，或先于主句发生的动作；which引导的多表示发生在主句之后的行为。
定语从句中as与which用法异同 (1)
定语从句中as 与which用法异同摘要：定语从句作为高考必考的语法项目之一，受到同学和教师的关注。
为了使同学们在高三学习及以后的复习阶段有章可循，不盲目，不失分，本文就定语从句中as和which 的用法作一简单比较。
关键词: as 与which 异同定语从句在高中语法的学习中是一个难点，也是高考必考的语法项目之一，为了使同学们在高三学习及以后的复习阶段有的放矢，现将定语从句中as和which的用法做一比较，供大家参考。
一、在限定性定语从句中as 和which 作为关系代词用法有差异：⑴、as 常与such, the same, as, so等词连用构成定语从句。
as 在定语从句中作主语、宾语、表语，这时作宾语的as 不可以省略。
as 在从句中指前面提到的人或物。
Such people as (people such as) you describe are rare nowadays.(你所描述的人现在已很少见了。
)I have the same trouble as you ( have ).(我和你有同样的困难。
)张道真 1995 实用英语语法［M］北京外语教学与研究出版社（7）：573-574He is as great a man as ever lived.注意：①the same ---as 引导的定语从句和the same ---that 引导的定语从句不相同。
the same---as 表示的是“和---一样的”所指的是同一类事物。
the same---that表示的是“如---一样的”所指的是同一个事物。
下面试比较：I bought the same dictionary as you bought.（我买了一本和你的一样的词典。
）I met the same person that I saw yesterday.（我遇见了昨天你看见得那个人。
）马德高，朱崇军 2008 高中英语语法全解［M］北京中国社会出版社 (7):252②such--- as---中，as 引导定语从句，as 在从句中作主语、宾语等; such--- that ---中的that 引导的是结果状语从句。
as和which在非限制性定语从句中的区别
as和which在非限制性定语从句中的区别作者：王艳霞来源：《新课程·教师》2010年第10期在非限制性定语从句中as和which是经常使用的关系代词,他们都可以指代整个主句,相当于and this或and that,但它们还是有各自的使用规则,有所区别。
一、从意义上看,as一般指代人们日常生活中都知道的常识性的东西,因而常被译成“正如”;而which代指前面主句的内容,意为“这一点”。
二、从位置上看,as引导的非限制性定语从句,既可放在主句前又可置于主句后,有时还可插入主句中,而which引导的非限制性定语从句只能置于主句之后。
例如:The weather turned out to be very good,which was more than we could expect.结果天气非常好,这一点我们没有料到。
As is known to everybody, the moon travels round the earth once every month.The moon travels round the earth once every month,as/which is known to everybody.众所周知,月亮每月绕地球转一次。
三、当定语从句放在主句后面时,一般用as和which都可以,但也不总是这样,例如:1.当非限制性定语从句是否定句或表示否定意思时只能用which。
如:He came here very late,which was unexpected(not expected).他迟到了,这是意料之外的。
2.当as在从句中作主语时,后面常接动词的被动语态,如be known、be said、be reported、be announced等。
如果从句是主动语态,一般用which作主语,如:She has been absent again,as is expected.她又缺席了,这在意料之中。
高中英语定语从句：As 和which 引导定语从句精讲精练
关系代词as和which 引导的定语从句as和which引导非限制性定语从句，有相同之处也有不同之处。
具体情况是：1. As和which都可以在定语从句中做主语或者宾语，代表前面整个句子。
He was honest, as/which we can see.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which 指代整个句子不可置于句首只能位于主句后。
1. They didn’t come to school on time, which made the teacher angry.2. The sports meeting was put off, which astonished (吃惊）us greatly.3. His father died last year, which made it impossible for him to go to school.4. He didn’t pass the exam, which disappointed his parents.as 引导定语从句，位置灵活，可位于句首、句中和句末。
As we all know, China is a developing country.The number of the visitors, as we had expected, was over 200.China is a great country with a long history, a s is known to all.注意:当主句和从句存在逻辑上的因果关系时,主句与从句有因果或并列，从句谓语动词是“系动词+adj" 使用whichOur class has won the volleyball match, which is inspiring.Tom suddenly fell ill, which made us sad. Tom突然病倒，这使得我们很伤心。
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。
定语从句aswhich区别
定语从句aswhich区别定语从句as which区别as和which作为关系代词都可以用来引导非限制性定语从句，指代整个主句所表达的内容，在从句中作主语或宾语，但它们在用法上有区别，这一点许多学生往往搞不清楚。
下面我们来了解一下定语从句as which区别吧!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引导非限制性定语从句时与which的区别
as引导非限制性定语从句时与which的区别的区别1.当主句和从句语义一致时，用as；反之，用which来引导非限制性定语从句来引导非限制性定语从句 2.当非限制定语从句为否定时，常用which引导。
引导。
3.AS可句子首或尾只在主句后面。
可句子首或尾 which只在主句后面。
4.such，same修饰先行词时关系词用as，介词后用which as/which都可以引导非限制性定语从句。
当引导词在从句中充当主语，若从句谓语动词是非be动词，只能用which.其他情况，比如引导词作主语，谓语动词均可。
是be动词，或者做宾语，或者做补语，as和which均可。
he said he was a king,which surprised me.只能用which he said he was a king,which/as was a lie. he said he was a king,which/as i don't believe. 若果定语从句移到前面则无论什么情况都用as as i believe,......... as is known to all,.......... as we all know,.......... as is reported,................ as is said,...... 2|评论Which as 1、语义的区别、语义的区别当主句和从句语义一致时，用as；He made along speech,as we expected. 当主句和从句语义转折不一致时，用which，He made along speech,which was unexpected. 2、位置的区别、位置的区别不可能放在句首。
看到句首一定用as，which 不可能放在句首。
as we all know, as is mentioned above as often happens as is often the case As is well known 3、含义的区别、含义的区别as有“正如”的含义，which没有此含义。
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。
which, as, what作关系代词的区别
which, as, what作关系代词的区别关系代词的辨别英语关系代词which, as, what的用法总是给学习者带来一定麻烦。
在语篇阅读中，总感觉意思模糊；在语法选择中，总感觉束手无策。
根据学生问的问题，拟从以下两个方面来对它们进行比较分析，希望对各位学生有所裨益。
一、句法分布特征关系代词which, as, what具有相同的句法功能，即引导非限制性定语从句，但是在句法分布上却有着一定的差异。
如：1) I gave my wife a necklace for her birthday, which pleased her a lot.我送给夫人一根项链作为生日礼物，这让她很高兴不已。
2) He opposed that plan, as had been expected.他反对那方案，这也正在人们的预料之中。
3) As has been expected, he opposed that plan.正如人们所料，他反对这个方案。
4) He, as had been expected, opposed that plan.他正如人们所料，反对这个方案。
5) He happened to be at home, and, what was rarer, disengaged.他碰巧在家，更稀罕的是，他竟闲着没事。
由此可以看出，关系代词which引导非限制定语从句时，通常放在句子的后面；关系代词as 引导非限制定语从句时，句法位置比较灵活，可以分布在句首、句中和句尾；关系代词what一般分布在句子中间。
二、表意功能大多数语音单位和单词和几乎所有句子和短语都具有表意功能。
因此which, as, what 三个关系代词引导的非限制性定语从句自然也具有表意功能。
虽然具有相同的句法功能，但是不同的句法分布特征，自然表明了不同的表意功能，因为任何一个特殊的句法组合形式都具有其独特的表意功能。
如：Tom failed in the exam, which annoyed his teacher quite a bit.汤姆考试没有及格，此事让他的老师颇为苦恼。
英语中关系代词which和as的区别
英语中关系代词which和as的区别(1)位置上，as可放在句首、句末，也可插入主句中;which一般放在主句之后(有时也可用as)：As we all know, reading is very important.Reading is very important, which we have already known when we were very young.(2)意义上，as有正如、按照、正像之意，一般用在肯定句中;which 可用于含肯、否定意义的句子中：He failed in the exam again, as was expected.He failed in the exam again, which was unexpected.(3)当定语从句所修饰的主句内容是谓语动词的对象时，常用as，如：Jack was admitted into the university, as we had expected.(4)固定结构，用as：as has been said before as often happensas is well known as we all can seethe same...as such...as(5)当关系代词代表主句引起的结果，又做主谓宾补(SVOC)结构中的主语时，多用which：He passed the exam, which made him delighted.(6)在从句中作介词宾语时，用which，如：They went to the zoo, after which they saw a film. (7)在从句中代表主句中的谓语的整个概念时，常用which，如：He can write a letter in English, which I cannot.(8)指代主句中某一名词时，多用which，如：Beijing, which he was born, is our capital.(9)代替主句中的形容词时, 常用which，如：Lily thought me clever, which she herself was.在定语从句中，相比于which VS that，who VS that，我们对which 与as两者区别的关注度要少很多，在遣词造句或是口语表达中，也常常是“跟着感觉走”。
as与which引导非限制性定语从句的区别
as与which引导非限制性定语从句的区别作者：董军权来源：《广东教育·高中》2013年第11期在教学实践中，尤其在批改作文中笔者发现，有的学生对as与which引导非限制性定语从句的用法模棱两可，含混不清。
下面从两者的用法区别展开说明，以便正确地使用。
1. 从指代的异同来说，as指代整个句子；which指代整个句子或者主句中的某个成分。
如：She is not unconscious，as can be judged from her eyes.她并未失去知觉，这从她的眼睛里可以看出。
（as指代整个句子）Mother always asked him to study hard，which helped him a lot. 他妈妈总是让他刻苦学习，这一点对他帮助很大。
（which指代整个句子）The house， which was built fifty years ago， stood still in the earthquake. 这所建造于50多年前的房子，在地震中依然耸立着。
（which指代具体的先行词）2. 就主句与从句的位置关系来说，as引导的从句可放在主句的前面或者主句的后面；which引导的从句只能放在主句的后面。
如：As everybody knows， knowledge is power. 众所周知，知识就是力量。
Knowledge is power， as everybody knows.众所周知，知识就是力量。
Knowledge is power， which is accepted widely all over the world.知识就是力量，这一点世界公认。
3. 从意义上来说，as意为“正如，像，由……而知”； which意为“这就使得，这一点”。
如：He is a great hero， as is described in the report.正如在报道中描述的一样，他是一个伟大的英雄。
as 和which的区别
which与as引导非限制性定语从句的异同which与as一样，都可以引导非限制性定语从句，它们既有相同之处，也有差别。
因此在实际运用中容易混淆。
它们的某些用法在高考中也会考查。
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.二．不同点1. as可指其前后主句提到的事实或情况，因此引导的非限制性从句位置比较灵活，which可以放在主句前后，也可插入主句之中；而which引导的非限制性从句只能位于主句之后。
As is known to all, fish can’t live without water.Air, as we know, is gas.2.在非限制性从句中，which后的be动词不可省；as而后的be动词可以省略。
She told me she won the match , which was a lie.The material is elastic, as (was) shown in the figure.3. which在非限制性定语从句做主语时可用各类动词做谓语；而在非限制性定语从句做主语时，谓语常用连系动词，如be, seem, become等，一般不用其他行为动词。
He saw the girl, which delighted him.He didn’t say anything at the meeting , as/which seemed very strange.4. 如果主句中叙述的事情与从句所涉及的意向一致，多用as，用以对主句的意义进行补充；如果不一致，就用whichShe has married again, as was expected.He broke the rules again, which was unexpected.5.如表示“如同。
定语从句as与which区别
定语从句as与which区别语义的区别：当主句和从句语义一致时，用as；当主句和从句语义转折不一致时，用which。
位置的区别：看到句首一定用as，which不可能放在句首。
含义的区别：as有“正如”的含义，which没有此含义，否定句用which。
在复合句中，修饰某一名词或代词的从句叫定语从句。
如：Do you know the man who spoke at the meeting just now?That is the house where he lived ten years ago.定语从句所修饰的词叫先行词；定语从句一般用关系代词或关系副词来引导，关系词放在先行词与定语从句之间起连接作用，同时又作从句中的一个成分。
引导定语从句的关系代词有：that, who, whom, whose, which;关系副词有：when, where, why.（一）关系代词的用法：1．作主语用who, which和that, 如：He is the man who/that lives next door.The train which/that has just left is for Shenzhen.2．作宾语用whom, who, which, that, 如：The man whom/who/that we have just seen is a famous writer.Where is the book which/that I bought last week?注：在非正式文体中，用于指人的关系代词who whom, that 通常可以省略，但在正式文体中通常用whom, 不可省略；用于指物的关系代词which和that 在非正式文体中也通常省略，但在正式文体中一般不省略。
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定语从句as和which的用法
定语从句as和which的用法定语从句是我们中学时期开始就一直陪伴我们度过各种考试一种长难句。
不知道小伙伴们有没有这样的感受，那就是虽然学了这么多年的定语从句，但是在做题的过程中，碰上了定语从句依然是一筹莫展，下面先和小编一起来看一下定语从句中关系代词as和which 的区别。
1. 互换的情况：两者有时可互换。
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。
2. 只有as的情况：以下两种情况，习惯只用as，不用which。
①在such, as, the same后引导定语从句时只能用ash。
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当从句位于主句前面时，只用as。
如：As is known to everybody, the moon travels round t he earth once every month. 月球每月绕地球转一周，这是每个人都清楚的。
3. 值得注意的情况：以下三种情况值得注意。
①as 引导的非限制性定语从句应与主句在意义上和谐一致，但which无此限制。
比较：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)②as 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。
which和as的用法归纳及比较
which和as的用法归纳及比较一、which引导名词从句的用法比较which作为连接代词，可以引导名词从句，在从句中作主语、宾语、定语或表语等语法成分。
that在引导名词从句时，只起连接主句和从句的作用，其本身没有任何含义，不翻译。
例如：（1）Which is better depends on these two clothes’ quality.（2）That Tony can’t swim is unbelievable.（3）I don’t know w hich I should choose，because the red andthe yellow are both beautiful.（4）I think that you can do it better.从例句中我们可以看到，which和that都可以引导主语从句和宾语从句，但是在（1）句和（3）句中which在从句中分别作了主语和宾语成分，而在（2）句和（4）句中that在从句中不作任何成分，只起到连接主句和从句的作用。
二、which引导定语从句的用法比较which作为关系代词，可以引导定语从句，在从句中可以代替物作主语和宾语等语法成分。
例如：（5）This is the book which/that I bought last week.（6）The clothes，which are over there，seem to have a goodquality.从（5）句和（6）句中我们可以看到which可以引导限制性和非限制性定语从句，并分别在句中作宾语和主语成分。
一般情况下，that和which在引导定语从句中代替物时可以互用，但以下情况一般要用which：非限制性定语从句中关系代词一般要用which；关系代词前如有介词、关系代词须用which，如把介词移至动词后，可用that（或省略）；如果先行词是that，关系代词应用which；如先行词和定语从句之间被其它较长的成分分隔，常用which；在“those+复数形式的名词”结构中，其后的关系代词多用which；一个句子中如有两个定语从句，第一个定语从句用了关系代词that，第二个从句中的关系代词宜用which。
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英语中关系代词which和as的区别
我们都知道，which和as都可以引导非限制性定语从句，有时可以互换使用。
但两者的用法又有所不同。
何时用which，何时又必须用as?是不是有些傻傻分不清?!来来来，今天就把这个问题一次拎清~~~
(1)位置上，as可放在句首、句末，也可插入主句中;which一般放在主句之后(有时也可用as)：
As we all know, reading is very important.
Reading is very important, which we have already known when we were very young.
(2)意义上，as有正如、按照、正像之意，一般用在肯定句中;which可用于含肯、否定意义的句子中：
He failed in the exam again, as was expected.
He failed in the exam again, which was unexpected.
(3)当定语从句所修饰的主句内容是谓语动词的对象时，常用as，如：
Jack was admitted into the university, as we had expected.
(4)固定结构，用as：
as has been said before as often happens
as is well known as we all can see
the same...as such...as
(5)当关系代词代表主句引起的结果，又做主谓宾补(SVOC)结构中的主语时，多用which：
He passed the exam, which made him delighted.
(6)在从句中作介词宾语时，用which，如：
They went to the zoo, after which they saw a film.
(7)在从句中代表主句中的谓语的整个概念时，常用which，如：
He can write a letter in English, which I cannot.
(8)指代主句中某一名词时，多用which，如：
Beijing, which he was born, is our capital.
(9)代替主句中的形容词时, 常用which，如：
Lily thought me clever, which she herself was.
在定语从句中，相比于which VS that，who VS that，我们对which与as两者区别的关注度要少很多，在遣词造句或是口语表达中，也常常是“跟着感觉走”。