as与which引导的定语从句区别(课堂PPT)
英语语法：关系代词as在定语从句中的运用
【 导语】定语从句就是在整个句⼦中充当定语的句⼦修饰名词或代词，被修饰的名词词组或代词即先⾏词。定语从句通常出现在先⾏词之后，由关系词（关系代词或关系副词）引出，⼩编在这⾥特意为⼤家整理了关系代词as的⽤法，⼀起来看⼀下吧！
⼀、引导限制性定语从句
⽤在 such, same, as 等之后，引导限制性定语从句。如：I live in the same place as Tom does. 我和汤姆住在同处。
He’s not such a fool as he looks. 他并不像看上去的那样愚蠢。
He smokes as expensive a cigarette as he can afford. 他抽⼀种他买得起的最贵的烟。
⼆、引导⾮限制性定语从句
单独⽤作关系代词，引导⾮限制性定语从句，可放在主句之前、之后或中间，且主从句之间⼀般要⽤逗号隔开。如：As was expected, he succeeded at last. 正如我们所料，他终于成功了。
I had coffee after dinner, as is my usual practice. 我饭后喝咖啡，这是我的习惯。
Freddie, as might be expected, was attending the conference. 弗雷迪在参加会议，这是可以预料到的。
三、as与which的⽤法区别① 引导限制性定语从句的区别：as⽤作关系代词引导限制性定语从句时，它通常只⽤于 such, same, as 等之后，⽽which ⽤作关系代词引导限制性定语从句时，则⽤于除 such, same, as 之外的其他结构。② 引导⾮限制性定语从句的区别：which引导⾮限制性定语从句时，通常只能位于主句后，⽽as引导的⾮限制性定语从句位于主句之前、之后或中间。
根据从句谓语动词的特点来看，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)
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.
(完整版)定语从句as的用法
as 引导定于从句：
1、as用作关系代词和关系副词引导限定性定语从句，并在从句中做主语、表语和状语，构成the same ...as, such...as等结构。
Eg: I have got into the same trouble as you.
2、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：（as we all know, as it is known, as is known to all, 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) .
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。
Eg:
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 forgot to bring his pen with him, as was often the case.
他忘了带笔，这是常事。（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） The two brothers were satisfied with
this decision, as was agreed
A定语从句which与that,as和which
定语从句which 和that的区别
1
定语从句中which和that的区别
只能用that的情况：
<1>关系代词在定语从句中作表语（或先行词在主句中做表语），不管是人或物只能用that。
He is not the man that he was when I first saw him.
【他现在不是我第一次见他时那样的。】
<2>当先行词即指物又指人时，多用that引导定语从句。
Look at the girl and the dog that are crossing the street.
【瞧正在过马路的那个女孩和那只狗。】
<3>当先行词是有生命的动物或人时，宜使用that而不是which。
1.What's the name of the animals that jumps about?
【四处蹦跳的动物叫什么名字？】
2.Who is the girl that talked to you yesterday?
【昨天和你说话的女孩儿是谁？】
<4>当先行词被形容词的最高级修饰时引导定语从句的关系代词只能用that，而不能用which。
This is the most interesting book that I've ever read.
【这是我所读过的最有趣的书。】
<5>当先行词被something,anything,nothing,everything all,
little,much, the one,none等时，引导定语从句多用关系代词that。
1.The goverment has promised to do all that lies in its power to
alleviate the hardships of people.
【政府承诺尽其一切力量减轻人民的苦难。】
2.When we see anything
as 的用法
AS在定语从句中的用法
1. 引导限制性定语从句和非限制性定语从句
（1）as多与such 或the same连用，可以代替先行词是人或物的名词。
（2）as 也可单独使用，引导非限制性定语从句，作用相当于which。例如：
The elephant’s nose is like a snake, as anybody can see.
（3）the same… that与 the same …as在意思上是不同的。
2．As引导的非限制性定语从句的位置
as引导的非限制性定语从句位置较灵活，可以位于主句前面．中间或后面，一般用逗号与主句隔开，但which所引导的非限制性定语从句只能放在主句之后。例如：
(1) As is expected, the England team won the football match.
(2) The earth runs around the sun, as is known by everyone.
希望对你有用啊！
英语:定语从句中什么时候用As作为先行词的关系词?
1、在“the same…as”和 “such…as”结构中，as是关系代词，引导非限制性定语从句，as在从句中作主语、宾语或表语。如：
⑴．Is it the same tree as can live everywhere?
⑵．I live in the same city as he (live in)．
⑶．China is no longer the same as it used to be．
⑷．I wish there would be such a machine as can work out all the problems．
⑸．We hope to get such a tool as he is using．
⑹．Such man as he is isn’t dealt with．
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。
【初中英语】定语从句as和which的用法(1)
定语从句
1. 非限定性定语从句——用逗号隔开
作用：提供附加而非必要的信息，只是对先行词作进一步的解释、补充或者说明。若去掉此定语从句，整个主句的意义一样很明确，不会引起误解和歧义。
eg.Beijing，which is the capital of China,has developed into a
international city.
如果定语从句修饰一个专有名词，我们一般要用逗号，也就是说要用非限制性定语从句。因为专有名词本身的含义就很完整，不需要限制，用定语从句知识对它进行补充说明。
2. As的用法
（1）as在引导限定性定语从句时，只是在一些固定的结构中，即只能用在such,the same, as ,so 的后面。
eg.he is not the same as we knew.
（2）as引导非限定性定语从句可位于句首，而which不能这么用。
eg.As is known, the whale is not fish but a mammal.（as指的是 the whale
is not a fish but a mammal.）
总所周知，鲸不是鱼类，而是哺乳类动物。
（3）as和which都可以引导非限定性定语从句，代替前面的整个句子。
eg.he married her, as/which was natural.
但因为as引导的定语从句有“正好...”,“就像...”,“由...而知”的含义。所以，当主句和从句内容上一致时，或者说从句内容是顺着主句意思说下来时，用as。若主句和从句内容上下不一致时，或从句内容对主句的内容起反对、排斥、否定等消极作用时，多用which。
eg. She has married again, as was expected.
She has married again, which was unexpected.
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。但含义有区别。1、Dorothy
was always speaking highly of her role in the play, _______ , of course, made the others
unhappy.
A. who B. Which C. this D. what
2、The number of senior high school students is increasing, _______ is mentioned above
A. that B. it C. such D. as
二、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
As we know(众所周知) ；As has been said above/before（正如前文所述） ；As has been
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 .