as与which的区别
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。
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，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：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 I don’t know which I should choosehich 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。
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：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 。
as和which引导非限制性定语从句的区别
As与which引导非限定性定语从句辨析1.as引导非限制性定语从句，只代表主语或主句的一部分所表达的意思(不能指代某个名词或代词)，可以放在主句前，后或中间，在从句中作主语或宾语、例如：As is known to all, he is the best student in our class. (as指代整个句子，作主语，置于句首)He opposed the idea, as could be expected. (as 指代整个句子，作主语，置于句末)As we all know, he studies very hard. (as 指代整个句子，作宾语，置于句首) Taiwan is, as you know, an inseparable part of China. (as指代整个句子，作宾语，置于句中)2.在非限制性定语从句中，which和as引导定语从句时的区别：a. which引导的从句不能放在主句前，而as引导的从句则既可以放在主句前，也可以放在主句后。
例如：As (正确)is often the case, he is absent.Which (错误)He saw the girl,as (正确)He had hoped.Which （正确）b.用能做关系代词，as和which都可以指代一个句子，但as有“正如”、“就像”之意，which则没有此含义。
He is a foreigner, as I know from his accent. (as指代一个句子，意为“正如”、“就像”)He has to work on Sunday, which he doesn’t like. (which指代一个句子，没有“正如”、“就像”)c.当从句的谓语动词是be或相当于联系动词的seem, become等时，可用as或which作主语。
但当从句的谓语是行为动词时，只能用which作主语。
英语as与which引导非限制性定语从句之区别
英语as与which引导非限制性定语从句之区别：练习题。
这类定语从句只能由which或as引导。
两者之间的区别在于：1. 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。
如：David, as you know, is a photograopher. (不可用which)Li Ming is late, as is often the case. (不可用which)2. as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。
如：Li Ming was late, which (=and this) made Mr. Zhang very angry. (不可用as)3. 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。
如：He married her, which was unexpected. 他和她结婚了，这是出乎意料的。
(不可用as)4. as有“正如”之意，而which则意为“这(件事，一点)”，可用and this/that/it来代替。
5. as多用于固定搭配中：as is often the case(这是常有的事)，as was expected(不出所料)，as often happens(正如经常发生的那样)，as is known to all(众所周知)，as has been said before(如上所述)，as is mentioned above(正如上面所提到的)等。
注：which代表整个句子，还可用于in which case, at which point, on which occasion 等。
如：I may have to work late, in which case I’ll telephone you.As的高考知识点归纳1．as做关系代词，引导非限制性定语从句2．as引导非限制性定语从句时，指代逗号前的整个句子（即先行词），常翻译为“正如，正像”，可置于句首或句末。
非限制性定语从句中which与as的用法
学法新探在非限制性定语从句中，which 与as 两者既有相通之处，又有相异之点。
如果把握不到位，区别不恰当，极易出错。
对此，笔者就非限制性定语从句中which 与as 的用法差异进行了剖析，以期同学们能够准确辨析和运用。
辨析之一：观“位置”在非限制性定语从句中，which 与as 的位置有所不同。
一般地，which 引导的非限制性定语从句不能置于句首，多位于主句之后；而as 引导的非限制性定语从句的位置则十分灵活，不仅可以置于主句之中和主句之后，而且可以置于句首，即置于主句之前。
比如，①Jake passed the driving test ，which sur-prised everybody in the office.杰克通过了驾驶考试，这使办公室里的每个人都感到惊讶。
（which 引导的非限制性定语从句置于主句之后）②Paper ，as we know ，was first made in China.众所周知，纸是中国人发明的。
（as 引导的非限制性定语从句置于主句之中）③She comes from South ，as I know from his ac-cent.我从他的口音中知道她来自南方。
（as 引导的非限制性定语从句置于主句之后）④As is known to all ，China has developed quickly these years and it has become one of the most important countries in the world.众所周知，近年来，中国的发展十分迅猛，目前已成为世界上最重要的国家之一.（as 引导的非限制性定语从句置于句首）从上述几个例子可以看出，which 与as 引导的非限制性定语从句都可以置于主句之后，两者有时可以互换。
但需要注意的是，当在主句之后的非限制性定语从句为否定句或带有否定意味时，只能用which 引导，不能用as 。
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。
as which 区别及独立主格
*This elephant is like a snake, as anybody can see. *As we all know, Tom is a good student.
*Shakespeare, as you know, wrote many plays. *Bamboos are hollow, which makes them very light.
As 常用的句式有： as you know as we can see as is said above, as is known to all, as is often the case, as as as as (wasБайду номын сангаасis) expected, already mentioned above, reported in the newspaper planned,
独立主格结构 （ 所谓独立主格结构，分词的逻辑主语与 句子主语不一致，而是有自己的逻辑主语时， 叫独立主格结构。）
being be ) Sunday, the library 1. Today ____( doesn’t open given give ), the bus 2. The signal _____( started. permitting( permit ), we’ll visit 3. Weather _______ the Great Wall. 4. A teacher from England teaching ______( teach ) us English, we’re sure to learn it well. being 5. There _______(be) no water, he is very thirsty.
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。
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。
北师大版高中英语必修3 Unit8_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这类定语从句只能由 which 或 as 引导。
两者之间的区别在于：1. 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。
如：David, as you know, is a photograopher. 戴维是个摄影师，你是知道的。
(不可用which) Li Ming is late, as is often the case. 李明迟到了，这事是经常发生的。
(不可用which)2. as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。
如：Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了，这件事使张先生非常生气。
(不可用as)3. 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。
如：He married her, which was unexpected. 他和她结婚了，这是出乎意料的。
(不可用as)4. as有“正如”之意，而which则意为“这(件事，一点)”，可用and this/that/it来代替。
5. as多用于固定搭配中：as is often the case(这是常有的事)，as was expected(不出所料)，as often happens(正如经常发生的那样)，as is known to all(众所周知)，as has been said before(如上所述)，as is mentioned above(正如上面所提到的)等。
注：which 代表整个句子，还可用于in which case, at which point, on which occasion等。
如：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1/ 1。
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as 与which 的区别
关系代词as 与which引导非限制性定语从句可以用整个主句作为其先行词，指代上面或下文所说的一件事。
但何时用as，何时用which，初学者在实际运用时常出现差错。
现就as 与which在引导这种定语从句时所出现的不同词义和句法特点进行对比、分析如下。
一、as引导的从句表示说话人对话语的看法、态度、解释或评论。
一般有以下特点：
1、此时的as仍具有“正如、象、由……而知、与……一致”等某些作连词时的语义。
翻译时有时可不必译出。
如：
Shakespeare is a famous writer, as we all know. 莎士比亚是著名的作家，这众人皆知。
She is very patient, as is shown in her work. 她很耐心，正如她工作中所表现出来的一样。
2、在句法上，as常用作一些实意动词(如see, know, hear, watch, remember, say, tell, show, expect, guess等)的宾语，这类动词与as几乎成了一种固定搭配。
如：Einstein, as we know(=as is well known), is a famous scientist. 众所周知，爱因斯坦是一位著名的科学家。
There was a net bar around here, as I remember. 我记得这儿附近有一家网吧。
3、当从句的谓语动词是否定形式或从句谓语动词带的是一个复合宾语结构时，一般用which而不宜用as。
如：
You pretended not to know me, which I didn’t understand. 他假装不认识我，我真不明白。
He admires everyone in the class, which I find quite strange. 他羡慕班里的每个学生，我认为太奇怪了。
4、as 从句可以前置（而which从句则不可）。
如：
As can be seen, oceans cover more than 70% of the earth. 很容易看出大洋占了地球的70%还多。
二、which引导的此类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。
一般有下列特点：
1、which此时就指前面主句所提到的这件事，常译为“这一点、这件事”等。
主句与从句通常要用逗号隔开，只能位于被修饰句子的后面。
如：
The child had a fever every night, which worried his parents very much. 这孩子每晚发烧，这使他父母非常焦急。
2、which在句法上一般用作实意动词的主语，这时它所引导的从句与主句之间常含有并列、因果关系。
如：
I bought my sister a big toy, which(=and that) delighted her greatly. 我给妹妹买了一个大玩具，这使她非常高兴。
3、在从句中作定语或介词宾语时，要用which。
如：
She might possibly come, in which case I’ll ask her.她可能会来的，要是那样的话我就去问她。
4、不能省去非限制性定语从句中的be动词时，用which (反之则用as)。
试比较：
Jane told me she won the match, which was a lie. (was 不可省略)
As (was ) planned, we met at the airport.(可省略was)。