as引导的定语从句及非限制性定语从句(课堂PPT)
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as引导定语从句的用法
as引导定语从句的用法
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
(1) As is known to all, China is a developing country.
(2) He is from the south, as we can see from his accent.
(3) John, as you know, is a famous writer.
(4) He has been to Paris more than several times, which I don’t believe.
================================
As 的用法例
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：
(完整版)高中英语非限制性定语从句(36张PPT)
tip
that, why不能在非限制性定语从句中使用。
Exercise1 Finish the following exercises.
1. Do you remember the day__w_h_e_n_/_o_n_which we went to school together?
2. She was always talking in the class, _w_h_i_c_h made other students unhappy.
去掉后,句意不完 去掉后，句意完整
整
修饰限制
只可修饰先行词
作宾语时可以省 略
补充说明
可修饰先行词或主句
不可省略且不能用 that , why 引导
Exercise3 Translate the sentences into Chinese: 1.His son who is twenty years old is a doctor.
(4)_形__容___词___比___较__级___/_最___高___级__ +介词+
关系代词：
China has thousands of islands, the largest of which is Taiwan.
Step four
Work in group of four to finish
as引导定语从句
A
9
（3）
1 as在非限制性定语从句中做宾语时通常 做see 、watch 、know 、say 、tell 、 remember 等词的宾语
It was true，as everybody could know．
As has been said before， China plays an important role in the world.
4. She will marry as wealthy a man as she can
find .
她将嫁给她能找到的任何一个有钱人。
A
6
5. There is so warm a house as we want to live in . 这里有如此暖和的房子，我们都想住在里面。
6. He has so difficult a problem , as none of us can solve . 他有如此难的一个问题，我们没有人能解决。
2 as在非限制性定语从句中做主语时， 谓语动词通常是被动形式，如是不及 物动词，则正常使用。
3 as often happens（appears）
A
10
as is well discussed 正如已讨论过的 as is often said 正如通常所说 as is often the case 通常就是这样 as has been pointed 正如所指出的那样 as has been said before 如上所述 as often happens 如同经常所发生的那样
as与which引导的定语从句区别(课堂PPT)
He speaks English very flBiblioteka Baiduently, which I can’t. 他的英语说得非常流利， 这我可不行。
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(8) 关系代词作定语修饰后面的名词时， 一般只用which, 而不用as。如：
He suggested going swimming in the river, which idea we agreed with. 他提议去河里游泳，我们就同意了他的
follow the traffic rules.
•Th能a力n目k标s for your
listening.情感态度
语言知识
Module8
Accidents.
生词…短语…句型 Unit 1
15
6
(4) As引导的非限制性定语从句指表示
积极的意义，与主句是顺理成章的关系，
绝不能与之矛盾。若非限制性定语从句
表示一种消极的意义，则只用which。 如：
He has succeeded in his career, as / which we all hope. 他在事业中成 功了，这正是我们大家所希望的。
Grammar Pit Stop
英语语法加油站
As 与Which引导的定语从句 的用法区别
临泽一中 王锟
1
一.as和which的相同点
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(8) 关系代词作定语修饰后面的名词时， 一般只用which, 而不用as。如：
He suggested going swimming in the river, which idea we agreed with. 他提议去河里游泳，我们就同意了他的
follow the traffic rules.
•Th能a力n目k标s for your
listening.情感态度
语言知识
Module8
Accidents.
生词…短语…句型 Unit 1
15
6
(4) As引导的非限制性定语从句指表示
积极的意义，与主句是顺理成章的关系，
绝不能与之矛盾。若非限制性定语从句
表示一种消极的意义，则只用which。 如：
He has succeeded in his career, as / which we all hope. 他在事业中成 功了，这正是我们大家所希望的。
Grammar Pit Stop
英语语法加油站
As 与Which引导的定语从句 的用法区别
临泽一中 王锟
1
一.as和which的相同点
高中英语语法精品课件：As引导的从句精讲
started off on foot. • As you are sorry，I’ll forgive you. • It is very difficult for us to know what to do as we
are not his parents.
6.引导方式状语从句
• as引导方式状语从句时，只修饰和说明主句的谓语动词， 表示“按照，依照”、“用什某么方式或方法”；as只起 引导词的作用，一般不在从句中充担成分；从句一般应置 于主句之后，有时也可置于主句之前。
• Please leave things as they are. • We left all the books as they were. • We should leave nature as it is.
9.引导表语从句
• as有时可以用来引导一个表语从句，意为 “像……的样子（那样）”。
• Just as he was speaking there was a loud explosion.
• He smiled as he passed. • As she sang，the tears ran down her cheeks. • We get wiser as we get older. • As a young man，he was a store keeper and
are not his parents.
6.引导方式状语从句
• as引导方式状语从句时，只修饰和说明主句的谓语动词， 表示“按照，依照”、“用什某么方式或方法”；as只起 引导词的作用，一般不在从句中充担成分；从句一般应置 于主句之后，有时也可置于主句之前。
• Please leave things as they are. • We left all the books as they were. • We should leave nature as it is.
9.引导表语从句
• as有时可以用来引导一个表语从句，意为 “像……的样子（那样）”。
• Just as he was speaking there was a loud explosion.
• He smiled as he passed. • As she sang，the tears ran down her cheeks. • We get wiser as we get older. • As a young man，he was a store keeper and
限制性定语从句和非限制性定语从句区别课件共23张PPT
非限制性定语从句应注意以下几点：
一、非限制性定语从句通常不能用that 引导。 1. I like the book, which was bought
yesterday. 我喜欢这本书，这是昨天买的。 2. I like the book which / that was bought yesterday. 我喜欢昨天买的那本书。
所有的杂志都是他写的, 里面都有漂亮的图 画。 （杂志只有一种）
当先行词是地名人名、世界上独一无二的 事物或家庭唯一成员时，通常只用非限制 性定语从句。
Mr. Smith, who is our boss, will leave for Japan.
Three of the biggest man-made projects in the world are the Great Wall of China，the Pyramids of Egypt and the Aswan High Dam， which is also in Egypt．世界上最大的三项人造 工程是中国的长城，埃及的金字塔和阿斯旺高 坝，它也在埃及。
2. She heard a terrible noise, which
brought her heart into her mouth. 她听到一个可怕的声音，这让她把心 都提到嗓子眼了。
四、非限制性定语从句由“介词+关系代词” 引导时，其中的关系代词不能用as。 1. He bought the car for more than $20,000,
中考语法--非限制性定语从句(共21页PPT)
Exercises:Fill the blanks.
1. I like girls _w_h_o_/_t_h_a_t___has black and long hair. 2. I like girls _w__h_o_s_e____hair is black and long.
3. I like the girl under the tree _, w__h_o___ has black and long hair. 4. I like the girl under the tree _,w_h__o_se___ hair is black and long.
Non-restrictive Attributive Clause
非限制性定语从句
contents
1. 限制性定从与非限制性定从的区别
1). 意思 2). 引导词 3). 关系代词的省略 4). 先行词 5). 不定代词/数词+of which/whom 结构
2. 限制性定从和非限制性定从小结
3. 练习
Exercises: Fill the blanks.
1. 2019__,_w_h_e_n___we took the entrance exam to high school, is an unforgettable year for me. 2. The year _w__h_e_n__ we took the entrance exam to high school is an unforgettable year for me.
专题08 定语从句--2023年高考高中英语语法课件(全国通用)
The poor man has no house in which to live. →The poor man has no house to live in. →The poor man has no house in which he can live. 那个穷人没房子住。
课堂练习
单句填空
(2)意义：as表示“正如，像”，常用于下列习惯用语中：as we can see “正如 我们都能看到的那样”；as is well known＝as is known to all “众所周 知”；as we had expected “正如我们所预料的那样”；as often happens “正如经常发生的那样”；as is often the case “正如经常发生的那样”；as has been said/seen/heard before 正如所说/所看/所听到的那样；as is mentioned above “正如上面提到的”；which常译作“这一点，这件事”，此 时指前面主句所提到的那件事。 ④He passed the examination, as could be expected. 不出所料，他反对这个意见。 ⑤Jim has made great progress, which makes his parents very happy. 吉姆进步很大，这使他父母很高兴。 (3)用法：当非限制性定语从句是否定句或表示否定意义时，只能用which。 ⑥He failed the examination, which was unexpected/not expected. 他考试失利了，这是未预料到的。
课堂练习
单句填空
(2)意义：as表示“正如，像”，常用于下列习惯用语中：as we can see “正如 我们都能看到的那样”；as is well known＝as is known to all “众所周 知”；as we had expected “正如我们所预料的那样”；as often happens “正如经常发生的那样”；as is often the case “正如经常发生的那样”；as has been said/seen/heard before 正如所说/所看/所听到的那样；as is mentioned above “正如上面提到的”；which常译作“这一点，这件事”，此 时指前面主句所提到的那件事。 ④He passed the examination, as could be expected. 不出所料，他反对这个意见。 ⑤Jim has made great progress, which makes his parents very happy. 吉姆进步很大，这使他父母很高兴。 (3)用法：当非限制性定语从句是否定句或表示否定意义时，只能用which。 ⑥He failed the examination, which was unexpected/not expected. 他考试失利了，这是未预料到的。
非限制性定语从句(课堂PPT)
• __I_t_ is known to all that the earth is round.
(形式主语)
•W__h_a_t is known to all is that the earth is round.
（主语从句）
13
注意4：非限制性定语从句和简单句的比较
1) He failed in the exam. __T_h_i_s__ made his parents angry.
8
注意1：有时同一个限制性从句变为非限 制性从句会改变全句的意思。
1) I have a sister who works in a hospital.
我有一位在医院工作的姐姐。 （不只一位姐姐）
2) I have a sister, who works in a hospital.
我有一位姐姐，她在医院工作。 （只有一位姐姐）
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Compare:
• The earth is round. __I_t_ is known to all.
• The earth is round, _w_h__ic_h__/_a_sis known to all. (定从)
• __A__s is known to all, the earth is round.
• as has been mentioned above 正如上面所提到的
非限制性定语从句(46张PPT)
so busy. 6. The school, _w__h_e_r_e_I once studied, was built thirty
years ago.
7. John said he’d been working in the office for an hour,__w_h_i_c_h_ was true.
2. The house, which we bought last month, is very nice.
3. Charles Smith, who was my former teacher, retired last year.
4. This novel, which I have read three times, is very touching.
在非限制性定语从句中，不能用that引导定 语从句，只能用who / whom指人，用which 指物，而且引导词不能省略。例如：
The chairman, who spoke first, sat on my right.
His speech, which bored everyone, went on and on.
b) His son, who is a doctor, is now visiting the USA.
2. a) This is the place where I lived ten years ago.
years ago.
7. John said he’d been working in the office for an hour,__w_h_i_c_h_ was true.
2. The house, which we bought last month, is very nice.
3. Charles Smith, who was my former teacher, retired last year.
4. This novel, which I have read three times, is very touching.
在非限制性定语从句中，不能用that引导定 语从句，只能用who / whom指人，用which 指物，而且引导词不能省略。例如：
The chairman, who spoke first, sat on my right.
His speech, which bored everyone, went on and on.
b) His son, who is a doctor, is now visiting the USA.
2. a) This is the place where I lived ten years ago.
(完整版)as引导定语从句
2. Such girls as he knows are good at English . 他所认识的女孩都擅长英语。
3. Do you have such books as we like ? 你有我们喜欢那种书吗？
4. She will marry as wealthy a man as she can find . 她将嫁给她能找到的任何一个有钱人。
as might be expected as we had expected正如所料 as is well known to all众所周知
as anybody can see
• It’s as pleasant a film as I have ever seen. 这是一部和我以往看的同样好的电影。
As many soldiers as marched were killed.
很多游行的战士都被杀了。
1. It’s the same person that we wanted to find yesterday . 我们昨天要找的是同一个人。
• We have arrived at the same conclusoin as they have.
• 我们已得出和他们同样的结论。
比较:the same...as和the same...that
• This is the same watch as I lost. • 这同我丢的那块表一样。 • This is the same watch that I lost • 这正是我丢的那块表。
3. Do you have such books as we like ? 你有我们喜欢那种书吗？
4. She will marry as wealthy a man as she can find . 她将嫁给她能找到的任何一个有钱人。
as might be expected as we had expected正如所料 as is well known to all众所周知
as anybody can see
• It’s as pleasant a film as I have ever seen. 这是一部和我以往看的同样好的电影。
As many soldiers as marched were killed.
很多游行的战士都被杀了。
1. It’s the same person that we wanted to find yesterday . 我们昨天要找的是同一个人。
• We have arrived at the same conclusoin as they have.
• 我们已得出和他们同样的结论。
比较:the same...as和the same...that
• This is the same watch as I lost. • 这同我丢的那块表一样。 • This is the same watch that I lost • 这正是我丢的那块表。
(完整版)as引导定语从句的用法
as引导定语从句的用法
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
(1） As is known to all， China is a developing country。
(2） He is from the south, as we can see from his accent.
（3） John， as you know， is a famous writer。
(4）He has been to Paris more than several times, which I don’t believe.
================================
As 的用法例
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:
as引导的定语从句及非限制性定语从句课件
The earth , as we know , moves round the sun .地球，我们都知道，围着太阳转。 Tom works hard and is willing to help others, as we all know.汤母工作努力，并且 乐于助人，这一点我们都知道。
学习交流PPT
学习交流PPT
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3.The man pulled out a gold watch , ______ hands were made of small diamonds(钻）。(2008,陕西）
4.A whom B that C they D whose
5.4) Gun control is a subject _____ Americans have talked for a long time.（2009陕西）
This is the same bike that we lost yesterday.
学习交流PPT
2
3) as 引导的非限制性定语从句， 位置灵活， 可位于句首，句中，句尾， as “正如，正像“ As everyone knows ,China is a beautiful country with a long history . 正如每个人都知道，中国是一个有着悠久历史 的美丽国家。
学习交流PPT
17
学习交流PPT
学习交流PPT
19
3.The man pulled out a gold watch , ______ hands were made of small diamonds(钻）。(2008,陕西）
4.A whom B that C they D whose
5.4) Gun control is a subject _____ Americans have talked for a long time.（2009陕西）
This is the same bike that we lost yesterday.
学习交流PPT
2
3) as 引导的非限制性定语从句， 位置灵活， 可位于句首，句中，句尾， as “正如，正像“ As everyone knows ,China is a beautiful country with a long history . 正如每个人都知道，中国是一个有着悠久历史 的美丽国家。
学习交流PPT
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高中非限制性定语从句详解.ppt
量， 为师 生 创造一 个良好 的工作 、学习 和生活 环境， 努力创 造一个 和谐校 园。
二、 工 作思 路 与 目 标
、 立足 常规优 化管理 机制
、 强化 意 识提 高 服 务 质
量
、 开源 节流 提升保 障能力
三、 主要 工作及 措施
、坚 持“ 以 人为
本” ， 强化 队 伍 建 设
加 强 学习 ， 提 高 后 勤 人 员 的 自 身 素 质 ， 增 强 服 务 意 识 。
一流 的学 校 需要 一 流 的 后 勤 ， 而 一 流 的 后 勤 需 要 配 备 一 流 素 质 的 人 员 。 下 面
是小 编 整理 的2017 年 中 学 总 务 处 工 作 计 划 ， 欢 迎 大 家 参 考 ！
2017 年中 学 总务
处工作计 划一：
一 、指导 思想
以党 的群众 路线教 育实践 活动精 神为指 导，
1.A.This is the place where I lived ten years ago .
B. The school,where I once studied,was built thirty years ago.
2.A.He is a man who I can ask for help.
This is so difficult a question ____ no one can work out.
Unit5Lesson1Aseastory定语从句(II)课件-高中英语北师大版
the city/ get the chance to h_o_s_t_the 2008 Olympic Games
Beijing is the city w__h_ic_h__/t_h_a_t has got the chance to host the 2008 Olympic Games.
a nurse/ die in the fight against SARS
whose+n=the +n+of+which/who
Which house is mine?
My house
房顶是棕色的房子是我的。 The housewhose roof is brown is mine.
I know the doctor. His daughter studies abroad.
This is the house where he lives. = This is the house __i_n_w__h_ic_h___he lives.
= This is the house _(w__h_ic_h_/_th_a_t_)_he lives in.
2、定语从句在修饰一个表示_时__间__的名词时，常用 when 引导。
Something that we heard was of great truth.
当先行词是all, everybody, nobody, anybody等不定代词时，如
关系代词as的用法总结PPT
03
as引导原因状语从句
表示“因为…”
as表示原因时，语气较弱，所表示的原因指比较明显，或是已知的事实。
as引导的从句可放在主句之前（表示原因不明显），也可放在主句之后（表示原因明显）。
表示“既然…”
as表示“既然…”时，引导的原因状 语从句一般放在句首，用逗号与主句 隔开，表示一种让步。
as引导的从句表示的原因是一种既成 事实，因此从句中的谓语要用一般现 在时或现在完成时。
用法
表示“和……一样”，用于比较状语从句，强调两者之间的相似 程度。
例句
She sings as sweetly as a nightingale.（她唱得和夜莺一样动 听。）
so as to/such as to
结构
so + 形容词/副词 + as to 或 such + 名词 + as to
用法
表示“按照…”
含义
根据某个标准、规则或指示进行。
例句
Please do as I say.（请按照我说的做。）
表示“以…方式”
含义
描述行为或活动的方式。
例句
She dances as gracefully as a ballerina. （她跳舞像芭蕾舞演员一样优雅。）
05
as引导让步状语从句
She has the same book as I have.（她有我所拥有的那本书 。）
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This is my motorbike, which was sent to me by my uncle
9
The vase, whose price is a little high, is valuable.
The girl, to whom I talked just now , was the manager of that company.
made the others unhappy.
a．who b．which c．this d．what
12
5. I boughtwenku.baidu.coman ancient chinese vase , _____ was very reasonable.
a. which price b. its price c. whose price d. that price
11
3.Carol said the work would be done by
October, ＿＿＿＿＿personally I
doubt very much.
a. it b.that
c.when d.which
4.Dorothy was always speaking highly of
her role in the play, ________,of course ,
This is the same bike that we lost yesterday.
2
3) as 引导的非限制性定语从句， 位置灵活， 可位于句首，句中，句尾， as “正如，正像“ As everyone knows ,China is a beautiful country with a long history . 正如每个人都知道，中国是一个有着悠久历史 的美丽国家。
限定先行词
对现行词起补充说明作用
8
The man , who has three children, is my uncle.
那个人， 有三个孩子， 是我的叔叔。
The man who has three children is my uncle.
那有三个孩子的人是我的叔叔。
She was late again, which made the teacher upset.
13
注意：1）定语从句中的主谓一致：
1.…one of +复数名词 + 关系代词+ 复数 形式动词
2. = …..not the only one of…….
3. Titanic is one of the most wonderful movies that have been produced in Hollywood.
4
注意：
as 引导的非限制性定语从句与which 引导 的非限制性定语从句异同：
1）都可指代整个句子，但as 从句位置灵 活，可位于句首，句中， 句尾， ”正如正 像”
2） which 引导的从句只位于主句之后，意
为A“s 这一点”,主从句一般是因果关系
_____is known , the ewahrtihchis round.
brought her heart into her mouth.
a.it b.which
c.this d.that
2.The weather turned out to be very good ,
____ was more than we could expect.
a.what b.which c.that d.it
The factory, where I worked , belonged to Japan.
The war, when/ during which Chinese fought against Japanese , last (持续） eight years.
10
1.She heard a terrible noise, _______
一 ：关系代词 as 引导的定语从句： 1） as 引导的限制性定语从句，一般 先行词前有such，the same 修饰， 构成 such + 名词 as…像……..之类的，像…..一
样的
the same + 名词 + as…和. …….同样的 as 可以充当主语，宾语或表语,
1
1. He is not the same man as he was. 2. Such girls as he knows are good at
She was late again, ______ made the 5
The road was too slippery, __w__h_ic_h__caused lots of accidents.
She entered a good university, __a_s__ we had expected.
6
7
限制性定语从句 非限制性定语从句
先行词与从句间没 有逗号隔开
先行词是名词或代 词
先行词与从句之间有逗号隔开
先行词是名词，代词或前面整个 句子（一般which指代整个句子）
关系代词，关系副 不能用that 引导，一般不用 词，介词+关系代词 why 引导而用for which 代替 引导
关系词做宾语时可省 关系词做宾语时不可省
The earth , as we know , moves round the sun .地球，我们都知道，围着太阳转。 Tom works hard and is willing to help others, as we all know.汤母工作努力，并且 乐于助人，这一点我们都知道。
3
常见的as 引导的非限制定语从句 as we all know as is known as every knows as we (had) expected as is mentioned above
English . 3.We have found such materials as are
used in their factory. 2)the same + 名词 + as……..像….一样的 3) the same + 名词 +that ……就是同一人或物 This is the same bike as we lost yesterday.
9
The vase, whose price is a little high, is valuable.
The girl, to whom I talked just now , was the manager of that company.
made the others unhappy.
a．who b．which c．this d．what
12
5. I boughtwenku.baidu.coman ancient chinese vase , _____ was very reasonable.
a. which price b. its price c. whose price d. that price
11
3.Carol said the work would be done by
October, ＿＿＿＿＿personally I
doubt very much.
a. it b.that
c.when d.which
4.Dorothy was always speaking highly of
her role in the play, ________,of course ,
This is the same bike that we lost yesterday.
2
3) as 引导的非限制性定语从句， 位置灵活， 可位于句首，句中，句尾， as “正如，正像“ As everyone knows ,China is a beautiful country with a long history . 正如每个人都知道，中国是一个有着悠久历史 的美丽国家。
限定先行词
对现行词起补充说明作用
8
The man , who has three children, is my uncle.
那个人， 有三个孩子， 是我的叔叔。
The man who has three children is my uncle.
那有三个孩子的人是我的叔叔。
She was late again, which made the teacher upset.
13
注意：1）定语从句中的主谓一致：
1.…one of +复数名词 + 关系代词+ 复数 形式动词
2. = …..not the only one of…….
3. Titanic is one of the most wonderful movies that have been produced in Hollywood.
4
注意：
as 引导的非限制性定语从句与which 引导 的非限制性定语从句异同：
1）都可指代整个句子，但as 从句位置灵 活，可位于句首，句中， 句尾， ”正如正 像”
2） which 引导的从句只位于主句之后，意
为A“s 这一点”,主从句一般是因果关系
_____is known , the ewahrtihchis round.
brought her heart into her mouth.
a.it b.which
c.this d.that
2.The weather turned out to be very good ,
____ was more than we could expect.
a.what b.which c.that d.it
The factory, where I worked , belonged to Japan.
The war, when/ during which Chinese fought against Japanese , last (持续） eight years.
10
1.She heard a terrible noise, _______
一 ：关系代词 as 引导的定语从句： 1） as 引导的限制性定语从句，一般 先行词前有such，the same 修饰， 构成 such + 名词 as…像……..之类的，像…..一
样的
the same + 名词 + as…和. …….同样的 as 可以充当主语，宾语或表语,
1
1. He is not the same man as he was. 2. Such girls as he knows are good at
She was late again, ______ made the 5
The road was too slippery, __w__h_ic_h__caused lots of accidents.
She entered a good university, __a_s__ we had expected.
6
7
限制性定语从句 非限制性定语从句
先行词与从句间没 有逗号隔开
先行词是名词或代 词
先行词与从句之间有逗号隔开
先行词是名词，代词或前面整个 句子（一般which指代整个句子）
关系代词，关系副 不能用that 引导，一般不用 词，介词+关系代词 why 引导而用for which 代替 引导
关系词做宾语时可省 关系词做宾语时不可省
The earth , as we know , moves round the sun .地球，我们都知道，围着太阳转。 Tom works hard and is willing to help others, as we all know.汤母工作努力，并且 乐于助人，这一点我们都知道。
3
常见的as 引导的非限制定语从句 as we all know as is known as every knows as we (had) expected as is mentioned above
English . 3.We have found such materials as are
used in their factory. 2)the same + 名词 + as……..像….一样的 3) the same + 名词 +that ……就是同一人或物 This is the same bike as we lost yesterday.