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as引导的定语从句的用法

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As 引导的定语从句：
1）“as”
As 在引导非限制性定语从句时，可以代替整个句子或一件事，在从句中做主语、宾语或表语，意为“正如…,就像…,据…”；从句位置可置于主句之前或之后，有时也可作为插入语置于句中，一般用逗号和主句隔开。

常见结构：as we can see, as can be seen, as we know, as is (well) known, as may be imagined, as often happens, as has been said before, as was mentioned above, as is ofen the case, as (indeed) it is, etc.
As is well known, great changes have taken place in China.
Great changes, as is well known, have taken place in China.
This experiment is very simple, as indeed it is.
Ps:
a) whch 和as 一样，也可代替整个句子引导非限制性定语从句，但which 只能用于主句之后；
b）在as引导的非限制定从中，如果运用的是被动语态结构，be 动词可以省略；但which 不可以：
She married him, which was unexpected.
= She marrid him as (was) unexpected.
2) as 除了代替整个句子，也可以代替主句中的一个特定词. As 在他引导的定语从句（限制性或非限制性）中可以充当主语，宾语和表语；在这种用法中它经常和such, so, same等词搭配使用，且当先行词中有such, so, same 等词修饰时，关系代词通常必须用as
They were satisfied with this decision, as was agreed beforehand.
I never heard such stories as he tells.
The place doesn’t look the same as it was before liberation.
Have you bought the same book as I referred to yesterday?
PS: 先行词中有the same 修饰时，定从也可用that 引导，但意思上有区别，as 表示与此相同的一类，that表示就是那一个。

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as 引导的定语从句

as 引导的定语从句

the same…that…
He is reading thesamebookthatI read yesterday.
他正在读我昨天读的那本书。，
such (+n.) +as…
such as…
Suchpeopleasknew Mary admired her.认识玛丽的人都钦佩她。
He is notsucha foolashe looks.他并不想看起来那样傻。
夜晚变得冷，在这一带通常如此。
Water is boiling at100°C,asis shown in the figure.如图所示，水在100°C时沸腾。
1.which即可指代整个主句又可指代主句中的一部份。
2.引导表示具体的内容
3.从句只在主句之后。
He changed his mind at the last moment,whichmade him angry.
他抽一种他买的起的最贵的香烟。
2.as与which引导的非限制定语从句的区别
as从句
例句
which从句
例句
1.as只指代整个主句。
2.引导从句时表示“正如”，没有具体的内容
3.从句的位置
很灵活
Air,asis well-known, is a gas.
众所周知，空气是气体。
The night has turned cold,asis usual around here.
他在最后一刻改变了主意，这是我很生气。
I called him by the wrong name, forwhichmistake I apologize.
我叫错了他的名字，对此我表示道歉。
3.as引导的非限制性定语从句常常成为一些惯用句型。
as定语从句用法

as定语从句用法

as定语从句用法1. 嘿，你知道吗，as 引导的定语从句就像是一把神奇的钥匙，能打开理解复杂句子的大门！比如“She is as beautiful as a fairy.”她就像仙女一样美丽。

2. 哇塞，as 定语从句的用法可重要啦！就如同是句子世界里的指明灯呀！像“He is not so strong as he looks.”他可不像看起来那么强壮。

3. 哎呀，as 定语从句的用处可大了去了，简直就是语言表达的得力助手呢！就说“As a child, he was very naughty.”小时候，他可调皮啦。

4. 嘿呀，as 定语从句可是个厉害的角色呢，就像给句子穿上了漂亮的外衣！例如“As we all know, the earth is round.”众所周知，地球是圆的。

5. 哇哦，as 定语从句的用法你可得搞清楚呀，这可关系到你的英语水平呢！像“She sings as well as her sister.”她唱得和她姐姐一样好。

6. 哎呀呀，as 定语从句多有趣呀，就好像是句子的魔法棒！比如“AsI expected, he passed the exam.”正如我所料，他通过了考试。

7. 嘿，别小看as 定语从句呀，它可是很了不起的呢，如同是语言的宝藏！像“He did the work as carefully as possible.”他尽可能仔细地做这项工作。

8. 哇，as 定语从句的魅力你感受到了吗？那简直就是语言的闪光点呀！例如“As is often the case, he was late again.”像往常一样，他又迟到了。

9. 哎呀，as 定语从句真的太有用啦，这可是英语的秘密武器呀！就说“As soon as I arrive, I will call you.”我一到就给你打电话。

10. 嘿哟，as 定语从句的重要性不言而喻了吧，简直就是英语学习的必备呀！比如“As time goes by, everything will change.”随着时间的流逝，一切都会改变。

定语从句as的用法

定语从句as的用法

1. such …as…“像……一样的”，“像……之类”the same…as…“和……同样的”例如：This is the same thing as we are in need of.2. …such as…such为代词，意思为”这样的人/物“，as修饰先行词such。

例如：This book is not such as I hope.3. …,as…在这里，as引导非限定性定语从句，相当于which引导的非限定性定语从句，有时可互换。

例如：He is from Beijing, as/which they know from the way he speaks.但是两者也有不同的用法：(1)位置不同as引导的定语从句可放在主句前,插入主句中或放在主句后，而which引导的定语从句只能放在主句后。

As we all know, getting up early is very helpful.If you go along the street to the end, as I tell you to do, you’ll find the hospital.（2）当非限制定语从句中谓语是 say, know, imagine, expect, announce, suppose 以及这些动词的被动式时，用as。

常见的结构有as we all know 众所周知as was expected 正如所预料的那样as was reported 正如报道的那样As is known to all, Taiwan is part of china.Einstein, as we know, is a famous scientist.。

初中英语定语从句知识点：As在定语从句中的用法

初中英语定语从句知识点：As在定语从句中的用法

初中英语定语从句知识点：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 elephants 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.。