as引导限制性定语从句
限制性定语从句是英语语法中从句的一种，是定语从句的分支之一。限定性定语从句表现为先行词在意义上是不可缺少的定语，若省略，所修饰主句的内容就不完整或失去意义，和主句的关系十分密切，写时不可用逗号分开。下面是小编为大家收集的as引导限制性定语从句，欢迎阅读，希望大家能够喜欢。
as引导限制性定语从句 篇1
一、相同点
两者引导非限制性定语从句时，可指代主句中的部分或整个句子的内容，在从句中做主语，宾语或表语，位于主句之后有时可互换。
The meeting was put off, as /which was exactly what we wanted.
He was a doctor, as/which I knew from his manner.
二、不同点
1. as可以放在主句前后，也可插入主句之中；而which引导的非限制性从句只能位于主句之后。
As is known to all, fish can’t live without water.
Air, as we know, is gas.
2.在非限制性从句中，which后的be动词不可省；as而后的be动词可以省略。
She told me she won the match, which was a lie.
The material is elastic, as (was) shown in the figure.
3. which在非限制性定语从句做主语时可用各类动词做谓语；而as做主语时，谓语常用系动词，如be, seem, become等，一般不用其他行为动词。
He saw the girl, which delighted him.
He didn’t say anything at the meeting , as/which seemed very strange.
4. as常用“正如”含义，常用的结构有as we know（众所周知）；as often happens（正如常发生的那样）；as is often the case（情况常常如此）; as we all can see（正如我们看到的）; beannounced/expected/known/imagined/mentioned/said/shown/reported等。这些结构常放句首，偶尔也可以放句中或句末。
As is known to all, China is a developing country.
Kate was late for school, as often happened.
5. 在非限制性定语从句中which指代主句中某一个单词时，as不可以。
My brother enjoyed playing basketball, which he really plays well.
Beijing, which he was born in, is our capital.
6. “介词+关系代词（介宾代物）”中关系代词只能用which。
The Travel Agency, with which our company has been dealing for several years, has opened for new branches.
Air is a mixture of gases, of which oxygen forms 21 percent.
7. 从句中的谓语动词是否定形式时，常用which。
He can write a letter in English, which I can not.
Metal will bear beating with a hammer, which a stone will not
8.在非限制性定语从句关系代词代表前面主句中的宾语从句时，常用which
He said he had passed the exam, which was untrue.
as引导限制性定语从句 篇2
1. as引导限制性定语从句的主要结构有：the same…as；as…as；such…as；so…as。主句中出现the same, as, such, so修饰先行词，需选择as做关系代词在定语从句中做主语或宾语。例，It’s the same person as we wanted to find yesterday .
2、as引导非限制性定语从句，指代整个主句内容，从句可置于句首，句中或句尾。
例：As everyone knows ,China is a beautiful country with a long history .
3、非限制性定语从句中的谓语为被动式时，常用as做主语。
例：besaid/known/announced/reported/mentioned/expected/discussed
as引导限制性定语从句 篇3
关系代词：在句中作主语、宾语或定语
1.that既可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词，which在从句中作宾语也可以省略。[eg：This is the book （which）you want.]
2.如果which在从句中作“不及物动词+介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的.则放在它原来的位置
3.代表物时多用which,但在下列情况中用that而不用which：
a)先行词是anything,everything,nothing ,none等不定代词时；
b)先行词由every,any,all,some,no,little,few,much等修饰时,这时的that常被省略；
c)先行词前有序数词或被形容词最高级修饰时；
d)先行词中既有人又有物时；
e)整个句中前面已有which,who,that时；
f)当先行词为物并作表语时；
g)先行词为one时；
h)先行词同时又被the only,the very,the same修饰时；
i)在there be句型中，句子的主语是先行词,而且又是物
j)以here is开头的句子
k）It is a high time+ 定语从句
4.who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语。
5.whose是关系代词，修饰名词作定语,相当于所修饰成分的前置所有格。它引导的从句可以修饰人和物，当它引导的从句修饰物体时，可以与 of which 调换，表达的意思一样。
关系副词
关系副词：在句中作状语
关系副词=介词+关系代词
why=for which
where=in/ at/ on/ ...which (介词同先行词搭配)
when=during/ on/ in/ ...which (介词同先行词搭配)
where是关系副词,用来表示地点的定语从句。
6.when引导定语从句表示时间[注]值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词,当然也不用that引导.
By the time when you arrived in London,we had stayed there for two weeks.到你到达伦敦的时候，我们在那里已经待了两个星期。
I still remember the first time when I met her.我仍然记得我第一次见到她。
Each time when he goes to business trip,he brings a lot of living necessities,such as towels,soap,toothbrush etc.每一次他去出差,他带来了生活必需品,如毛巾,肥皂,牙刷等其他东西。
7.当从句的逻辑主语是some,any,no,somebody,anybody,nobody,something,anything,everything或nothing时,常用there is 开头。
There is somebody here who wants to speak to you.这里有人要和你说话。
非限制性定语从句的作用是对所修饰的成分作进一步说明,通常是引导词和先行词之间用逗号隔开,将从句拿掉后其他部分仍可成立。
as引导限制性定语从句 篇4
1.先行词指物,在句中作主语或宾语which:
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然耸立，它是一百多年前建造的。)
注意：无论先行词指人或者指物,在句中作主语或者作宾语，非限制性定语从句的引导词都不能用that。
2.先行词在句中作定语，无论指人或者指物,引导词都用whose:
The girl,whose name is Kate,is the top of the students in our school.(那个女孩是我们学校最优秀的学生，她的名字叫Kate。)
The book,whose cover is red,is mine.(封面是红色的那本书是我的。)
3.先行词指人,在句中作主语who:
John,who is only five,has an inborn talent for music. (约翰是一外5岁大的孩子,有着天生的音乐才能。)
4.先行词指人,在句中作宾语whom:
His wife,whom you met at my home,was a teacher.
(他的妻子，就是你在我家遇见的那个，是一位老师。)
5.先行词指物，在句中作时间状语用when：
The sports meeting will be put off till next month,when we will have made all the preparations.(运动会将被推迟到下个月，那时我们做好一切准备。)
6.The next day we arrived in New York,where we were inerviewed on the radio.(第二天我们到达纽约，在那里我们接受了电台的采访。)
7.如果先行词作介词的宾语，先行词指人，介词提前的结构是：介词+whom;先行词指物，介词提前的结构是：介词+which:
President Wilson,with whom he had not the same intimate relations,is treated much less sympathetically.(威尔逊总统与他没有同样的亲密关系，所以就没有被很同情地对待。) The Second World War,in which millions of people were killed,ended in 1945.(第二次世界大战造成数百万人的死亡，于1945年结束。)
8.as也可以引导定语从句，常与such连用：
Such people as you describe are rare nowadays.(象你所描绘的那种人现在已经很少见了。) Let's disscuss only such questions as concern us.(让我们只讨论那些和我们有关的问题吧。) 注意：the same that+从句，意思是：正是那一个人或物;the same as+从句，意思是：就像某个人或物：
He is the same man that you are looking for.(他就是你要找的那个人。)
He is the same man as you met in the street.(他很象你昨天在街上遇见的那个人。实际上并不是那个人。)
This is the same pen that I lost yesterday.(这就是我昨天丢失的那支笔。)
This is the same pen as I lost yesterday.(这很像昨天我丢失的那支笔。)
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