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
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。例如：
He married her, as (正确) was / seemed natural.
Which （正确）
He saw the girl, as (错误) delighted him.
Which （正确
定语从句as 和which 的区别讲义
名词性从句区别
名词性从句是一种具有名词功能的非独立分句，可以表示：事实和问题。
1.连接词有： that whether 和 lf
2.连接代词有：who whom whose which what 等
3.连接副词有：when where why how 等
另外 whatever whoever whichever等 也可 以引导主语和宾语两种从句
名词性从句中的“that”没有词义，也不作任何成分。除引导宾从外，主从和表从中不省
1. 主语从句：从句在句中充当主语成分
1) That the earth is round is true .
2) Whether he will come is doubtful .
3) What he said surprised me most .
4) Where he hid the money is to be found out .
5) Whoever comes is welcome.
6) It’s certain that he will succeed
7) How we can help the twins will be discussed at the meeting.
8) When they’ll start the project has not been decided yet
It 的用法： （形式主语）
It’ possible/important/necessary/clear… that……
很可能/重要的是…/必要的是…/很清楚…
It’ said/ reported… that…据说/据报道…
It’s been announced/declared that…已经通知/宣布…
It seems/appears/happens.. that…显然、明显、 碰巧…
特殊的定语从句As的用法
特殊的定语从句As的用法
特殊的定语从句As的用法如下：
1、引导限制性定语从句。在主句中常有the same, so或such与as相呼应, as在定语从句中可作主语、宾语、主语补足语等。as引出的定语从句带有比较意义，从句常常只写出比较部分，但as本身不可省略。例如：
He used such expressions as he could find in the texts. 他使用在课文中可以找到的那些词语。 They stayed for the night in the
same room as they had once rented.他们在他们曾租用过的同一房间过夜。
注意：在the same…后也可用that引导定语从句，但含义有所不同。that引出的从句，指的是与先行词同一的事物，而as引导的从句指的是与先行词同类的事物。例如： This is the same bag as I lost
yesterday.这个包和我昨天丢失的包的样子是同样的。 This is the
same bag that I lost yesterday.这就是我昨天丢失的那个包。
2、引导非限制性定语从句。带主句的全部或部分内容。常译为“正如-------”“就像------”等，定语从句可以置于主句句首、句中或句末。as后常接expect, know, report, say, see等动词的`主、被动语态。例如：
As is known to everybody, the moon travels round the earth
once every month.正如大家所知道的那样，月球每月绕着地球转一圈。
He wasn’t unconscious, as could be judged from his eyes.他并未失去知觉，这从他的眼神可以看出来。
注意：as, which引导非限制性定语从句的区别：
as引导定语从句时的用法
as引导定语从句时的用法
as引导定语从句时的用法
①as引导限制性定语从句通常用于the same„as, such„as结构中。
e.g.I want the same shirt as myfriend’s.我要一件跟我朋友一样的衬衫。
Such machines as are used in our workshop are made in China.我们车间使用的这种机器是中国制造的。
②as引导非限制性定语从句既可放在主句之前，也可放在主句之后，用来修饰整个句子。通常用下列句型：
as is known to all,as is said,as is reported,
as is announced,as we all know,as I expect等。
e.g.As I expected,he got the first place again in this mid-term
examination.正如我所预料的那样，他在这次期中考试中又获得了第
as引导非限制性定语从句时与which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。e.g.He made along speech,as we expected.
He made along speech,which was unexpected.
②当非限制定语从句为否定时，常用which引导。
e.g.Tom drinks a lot everyday,which his wife doesn’t like at all.
2.关系代词在从句中作主语时，从句的谓语动词单数还是用复数应由先行词决定。
e.g.The man who lives downstairs speaks English fluently.住在楼下的那个人英语说得很流利。
The students who are in GradeThree are going to climb the hill tomorrow.
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，
as的非限制性定语从句
导语：以下是店铺精⼼为⼤家整理的有关as的⾮限制性定语从句的⽰例，希望对⼤家有所帮助，欢迎阅读。
⾮限制性定语从句：
即⾮限定性定语从句，起补充说明作⽤，缺少也不会影响全句的理解，在⾮限定性定语从句的前⾯往往有逗号隔开，如若将⾮限定性定语从句放在句⼦中间，其前后都需要⽤逗号隔开。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引导的⾮限制性定语从句
as引出⾮限定性定语从句时，代替整个主句，对其进⾏说明但通常⽤于像as we all know, as it is known, as is known toall, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在⾮限定性定语从句中作主语、表语或宾语，且引出的'从句位置⽐较灵活，可位于句⾸或句末，也可置于主句中间。通常均由逗号将其与主句隔开。as有“正如……，就像……”之意。
如：As is known to the United States, Mark Twain is a great American writer.
美国⼈都知道，马克·吐温是⼀位伟⼤的美国作家。
（as在从句中作主语）
He is absorbed in work, as he often was.
他正在全神贯注地⼯作，他过去经常这样。
（as在从句中作表语）
As we all know, the earth is round.
众所周知，地球是圆的。
（as在从句中作宾语）
使⽤规则及注意事项：
1、which引导的⾮限定性定语从句是⽤来说明前⾯整个句⼦的情况或主句的某⼀部分。
非限制性定语从句中的关系代词which和as用法辨析
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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. that B. which C. it D. 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)
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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）：573-574
He 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.
考研英语语法之三大从句
三大从句
一、定语从句
定语从句，简言之，就是用来做定语的句子，即用于修饰名词或代词的一个具有完整主谓结构的句子。这个被修饰的名词或代词因为总是在定语从句的前面，所以我们称之为先行词。而引导定语从句的连词，叫关系词，分为关系代词和关系副词。
One reason why it is hard to design and teach such courses is that they cut across the
insistence by top American universities that liberal-arts education and professional education
should be kept separate, taught in different schools.
（一）定语从句的先行词
先行词是定语从句所修饰的对象。只有正确找出先行词，才能明白定语从句所修饰的究竟是什么成分，才能正确理解句子前后各部分的逻辑关系，分清句子结构，从而正确理解句子。
1. 一个词（通常是名词，也可以是代词）
For a social epidemic to occur, however, each person so affected must then influence his or
her own acquaintances, who must in turn influence theirs, and so on; and just how many others
pay attention to each of these people has little to do with the initial influential.
2. 一个短语
During the past generation, the American middle-class family that once could count on hard
as在定语从句的用法
as在定语从句的用法
as 在定语从句的用法
英语是一种西日耳曼语支，最早被中世纪的英国使用，并因其广阔的殖民地而成为世界使用面积最广的语言。下面是店铺为大家整理的as 在定语从句的用法，欢迎阅读与收藏。
as 在定语从句的用法1
一、as引导定语从句与其它词连用
A．用于the same．．．as．．．结构中
This is the same sickle as I lost yesterday．这把镰刀和我昨天丢的那把一样。
We drove out of the town by the same road as we had
entered by．我们沿着进城的同一道路开车出城。
This is the same material as is used in building the bridge．这和建那座桥所用的材料一样。
注意：在这一结构中，as有时可以由that代替。例如：
I live in the same district as ／that he lives in．我和他住在同一区。
但两者亦有区别：
1．当定语从句省略谓语部分时，要用as。例如：
She uses the same scent as you（do）／that you do．她用的香水和你的一样。
This book of his is the same as yours．他的这本书和你的那本一样。
2．在容易引起歧义时，慎用as和that。例如：
This is the same knife as I lost last week．
（一般理解为：这把刀和我上周丢的那把相似。也可理解为：这是我上周丢的那把刀。）
This is the same knife that I lost last week．这是我上周丢的那把刀。 3．that在现代英语中可作关系副词，而as则不可。例如：
I live in the same district that he lives．（不可用as。）
as与which引导的定语从句及定语从句关系代词和关系副词的区别教案
个性化教案
as与which引导的定语从句及
定语从句关系代词和关系副词的区别
适用学科 英语 适用年级 高三
适用区域 适用版本区域 课时时长（分钟） 60分钟
知识点 1. as与which引导的定语从句
2. 只能用which引导的定语从句
3. 定语从句与状语从句的区别
4. 定语从句的强调句型
教学目标 知识：1、掌握定语从句中非限制性定语从句的使用。
2、能准确使用关系词解答定语从句的相关问题。
方法：要总结、熟记一些关系词在定语从句中的使用；要学会在实际中灵
活运用。
能力：1、能正确运用关系代词和关系副词在各类定语从句中。
2、掌握并会分析句子成分，从而熟练解题。
教学重点 1.继续探讨关系词在非限制性定语从句中的应用
2.通过对相似句型的比较及句子成分的分析，在一些特殊情况下，关系
代词和关系副词如何进行选择
教学难点 as 引导的非限制性定语从句；定语从句中需要注意的特例。
教学过程
一、 复习预习
1.关系代词的种类：
关系代词: that, which, who, whose,
关系副词: when, where, why
2. He talked about the schoosl and the teachers _______he had visited . 个性化教案
A. that B. which C.who D. whom
3. He talked about the schoosl and the teachers _______he had visited .
A. that B. which C.who D. whom
4.Thelost their way in the forest ,_______made matters worse .