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。
例 6 He turned his eyes on Philip’s face，as he had not done
for ten years.他转过身来看着菲利普的脸，他十年来没有这样看过他的脸了。
例 7 He really can’t lend you the money，as you might not
realize. 他的确不能把那些钱借给你，这一点你可能意识不到。
(二)用法上的区别
1. 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比较灵活，可以放在前，也可以放在后，甚至还可以分割主句。另外，as 常常有“正如、正像”的含义。
例 8 As he realized, I was very useful to him.(在前)
例 9 Air, as we know, is a gas. (在中)
例 10 He was a foreigner, as I know from his accent. (在后)
例 11 He came late again, which made his boss angry.(在后)
例 12 As is known to all, China is a developing country. 众所周知，中国是发展中国家。
(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 13 He is a teacher, as (is) clear from his manner. (is可以省略)
例 14 He said he had never seen her before, which was not
true. (was 不可省略)
as, which 非限定性定语从句的用法
——文章来源网，仅供分享学习参考 1 as, which 非限定性定语从句的用法
以下是小编给大家整理的as, which 非限定性定语从句的用法，希望可以帮到大家
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.
典型例题
1)Alice received an invitation from her boss, ___came as a surprise.
A. it B. that C. which D. he
答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。
2)The weather turned out to be very good, ___ was more than we could
expect.
A. what B. which C. that D. it
答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。
3)It rained hard yesterday, ____ prevented me from going to the park..
A. that B. which C. as D. it
as与which引导非限定性定语从句用法
as与which引导非限定性定语从句用法
首先，as和which都可以表示主句在意义上的连贯，在从句中作主语，或用作及物动词的宾语，如：
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： He was late for school ， as/which was usual with him ．他上学迟到，这是家常便饭。
He married her， which／as was natural．
I was very helpful to him， which/ as he realized．
二．as含有正如、按照、正像之意，as一般用在肯定句中，而which则 多用于含否定意义
的句子中，如： As our teacher points out， that book is of benefit to everyone．
Heat is a form of energy， as is known to all of us．
This machine， as might be expected， has stopped operating．
He failed in the exam again， as was expected．
He failed in the exam again， which was unexpected．（此处不可用 as ）
as 所引导的从句所表达的语意须和主句一致，而 which 则无此限制。
三．as 常与从句中的 know ， see ， hear ， expect 等动词连用，也常用于 as often happens ， as is often the case （常有的事）等句子中。下列固定结构，一般不能用which，如： as has been said before 如前所述 as often happens 正像经常发生的那样 as is well known 众所周知 as will be shown in Fig 3 将如图3所示 as we know 正如我们知道的那样＂ as may be imagined 这可以想象得出来 as we all can see 正如我们大家看到的那样 She is the same age as you (are). 她和你年龄一样大。 [ 与 same...as 连用 ] I hope to get such a dictionary as he is using. 我希望有一本和你正在用的一样的词典。 [ 与 such...as 连用 ] As water is to fish, so air is to man. 正如水对鱼一样重要，空气对于人同样重要。 四．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，
英语语法：定语从句中的AswhichSosuch…that
【 导语】英语语法是针对英语语⾔的语法进⾏的研究，指英语中语⾔的结构规律。为了帮助各位同学更准确的记忆英语⼊门语法，为⼤家整理了英语语法顺⼝溜系列，在此与⼤家分享~
英语语法顺⼝溜：定语从句7---As/which/So /such …that
As/which在句末，若有否定as错;
as和 which都可指代前⾯⼀句话，请看例句:
1)Alice received an invitation from her boss, which came as a surprise.
爱丽丝受到了她⽼板的邀请，这使她感到吃惊。
2)The weather turned out to be very good, which was more than we could expect.
天⽓结果变好了，这是我们没有预料到的。
若有否定as错;
3)The result of the experiment was very good, _______ we hadn't expected.
A. when B. that C. which D. what
【简析】答案是C。由于⾮限定性定语从句是否定结构，只能⽤which引导，不能⽤as来替代which。
句⾸只能⽤as,还有认知猜想词; 置于句⾸时，⾮限定性定语从句只能⽤as引导。例如：
As is known to everybody, the moon travels round the earth once every month.
众所周知，⽉亮每⽉绕地球⼀周。
与表⽰认知猜想的词，如know, expect, see, report, 连⽤时，要⽤as。
1)As we know, smoking is harmful to one's health.
我们知道，吸烟对健康有害。
2)As is expected, his daughter entered a key university.
as和which引导非限制性定语从句的区别
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，位置灵活，可以置于主句的句首、句中或句末；先行词不可是一个词，必须是整个主句或主句的部分内容；有“正如、像”等意思，表依据、评论（、态度、看法）等；如：
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。
He failed in the exam, as we had expected.
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。】
常用以下谓语动词的主、被动语态：know, see, say, expect, imagine, hope, believe, announce,
suggest, report, point out„, 例：
主动（做宾）：as we all know, as you know, as everybody knows; as you see, as we can see, as we
have seen, as anybody can see; as was expected; as we can imagine, as we have imagined„
As we all know, the earth is round.
He was a foreigner, as I know from his accent.
Mike, as we expected, attended the meeting．像我们所期望的那样，迈克参加了会议。
被动（做主）：as is known to everybody, as is known to all; as has been expected; as is often the
定语从句什么时候用as
定语从句什么时候用as
定语从句什么时候用as
导语： 一般说来,as与which的语义功能相同,可以相互替换.但先行成分为句子时,它们的语义功能则有差异.下面是店铺给大家整理的定语从句时候用as的相关内容，希望能给你带来帮助!
定语从句什么时候用as
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 always 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
as 和 which 引导定语从句的区别
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as 和 which 引导定语从句的区别
先看两道高考题：
1． _____ is known to all，China will be an _____ powerful country in 20 or 30years'time．
A．That；advancing B．This；advanced C．As；advanced D．It；advancing
2．He made another wonderful discovery， _____ of great importance to science．
A．which I think is B．which I think it is C．which I think it D．I think is
分析：第一题考查了 as在从句中作主语的定语从句，意为“正如”，而ad- vanced
country表示发达国家；第二题考查了which引导的非限制性定语从句，I think是插入语。这两个句子分别含有as和 which引导的定语从句，现就其用法作一说明：
一、as引导的定语从句表示说话人对话语的看法、态度、依据、解释或评论。具有下列特点：
1．as用于引导定语从句时，具有“正如„„、像„„、由„„而知”等语义。如：
He was strongly against the plan，as could be expected．（正如所料，他强烈反对这项计划。）
As he hoped he would，he saw the girl．（像他希望的那样，他见到了那个女孩。）
2．as引导的定语从句在语义上要和主句保持一致，而which可不一定，如果语义不一致，则要用which来替代as。如：
中考英语语法详解：as与which的用法区别 (2).doc
2017年中考英语语法详解：as与which的用法区别
【英语语法】
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 you know. 我住得离工作单位很远，这你是知道的。
1. 通常要用as的场合
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。
②用于such, as, the same后引导限制性定语从句时，只能用as。如：
I never heard such stories as he tells. 我从未听过他讲那样的故事。
This is the photo which shows my house. 这张照片拍的是我的住宅。
2. 两者的细微区别
①as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 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。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)
③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 seemed natural. 她又结婚了，这似乎很自常。
谈as和which引导非限制性定语从句时的用法区别
谈as和which引导非限制性定语从句时的用法区别
2.As we know, heavy objects and light objects fall at the same speed unless air holds them back.
3.As we have seen, oceans cover more than 70 percent of the earth.
4.They (The stems of bamboo) are hollow, which makes them very light.
5.They won, which meant they would run for the United States.
6.A certain scientist had discovered that a metal called uranium gave off a kind of radiation, which
Marie Curie was later to call radioactivity.
上例1—3句中的“as”都是关系代词，引导非限制性从句，其所指代的先行项是整个主句（即划线部分）。同样，例4和例5中的“which”也是关系代词，引导非限制性定语从句，“which”
的先行项也是整个主句（划线部分）。例6中的 “which”所指代的先行项是“that”引导的整个宾语从句（划线部分）。
因此，一些学生常问此时的“as”和“which” 是否可以互换使用，在实际使用中应如何选择。
as和which在引导非限制性定语从句中时，其用法有三点相同和四点不同之处。
一、相同点：
1. “Which”和 “as” 都可在SVC（主语+系动词+表语）或SV（主语+谓语）结构的非限制性定语从句中作主语，此时两者可互换使用。例如：
He said he had lost the book, which/as was true.
as和which引导的定语从句
As与 which引导的定语从句
先研究下面两个例句：
○1.This elephant is like a snake, as /which everybody can see.
=As everybody can see, this elephant is like a snake.
任何人都看得出来，这头象像条蛇。
○2.Tom didn’t pass the physics exam, which made his parents very angry.
Tom物理考试不及格，这使得他父亲很生气。
这两个例句中，as和which所代表的都是整个主句所表示的内容。但有两点不同之处：
1． 在形式上as引导的非限制性定语从句可位于主句的后面，也可位于主句的前面；而which引导的非限制性定语从句只能位于主句的后面，不能位于主句的前面。
2． 在意义上，as引导的定语从句和主句的关系一般为一致关系，常译为“正如……”，“就像……”，而which引导的定语从句和主句的关系是因果关系，或which引导的定语从句是对主句的评论。因此，在意思通顺的情况下，which可代替as，而as许多时候不能代替which，如句○2。再如：
1．He was late again, as / which we had expected.
=As we had expected, he was late again.
正如我们所料，他又迟到了。/他又迟到了这是我们早就料到的。
2． The street hasn’t been cleared for weeks, which makes it very dirty.
街道好多星期没有打扫了，因此整条街很脏。（不用as）
3．The young man cheated his friend of much money, which was disgraceful.
那年轻人诈骗了他朋友许多钱财，这是不光彩的。（不 用as）
as与which引导非限制性定语从句的区别
龙源期刊网
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：