as引導限制性定語從句
限制性定語從句是英語語法中從句的一種，是定語從句的分支之一。限定性定語從句表現為先行詞在意義上是不可缺少的定語，若省略，所修飾主句的內容就不完整或失去意義，和主句的關系十分密切，寫時不可用逗號分開。下面是小編為大家收集的as引導限制性定語從句，歡迎閱讀，希望大家能夠喜歡。
as引導限制性定語從句 篇1
一、相同點
兩者引導非限制性定語從句時，可指代主句中的部分或整個句子的內容，在從句中做主語，賓語或表語，位于主句之后有時可互換。
The meeting was put off, as /which was exactly what we wanted.
He was a doctor, as/which I knew from his manner.
二、不同點
1. as可以放在主句前后，也可插入主句之中；而which引導的非限制性從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.在非限制性從句中，which后的be動詞不可省；as而后的be動詞可以省略。
She told me she won the match, which was a lie.
The material is elastic, as (was) shown in the figure.
3. which在非限制性定語從句做主語時可用各類動詞做謂語；而as做主語時，謂語常用系動詞，如be, seem, become等，一般不用其他行為動詞。
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”含義，常用的結構有as we know（眾所周知）；as often happens（正如常發生的那樣）；as is often the case（情況常常如此）; as we all can see（正如我們看到的）; beannounced/expected/known/imagined/mentioned/said/shown/reported等。這些結構常放句首，偶爾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. 在非限制性定語從句中which指代主句中某一個單詞時，as不可以。
My brother enjoyed playing basketball, which he really plays well.
Beijing, which he was born in, is our capital.
6. “介詞+關系代詞（介賓代物）”中關系代詞只能用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. 從句中的謂語動詞是否定形式時，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.在非限制性定語從句關系代詞代表前面主句中的賓語從句時，常用which
He said he had passed the exam, which was untrue.
as引導限制性定語從句 篇2
1. as引導限制性定語從句的主要結構有：the same…as；as…as；such…as；so…as。主句中出現the same, as, such, so修飾先行詞，需選擇as做關系代詞在定語從句中做主語或賓語。例，It’s the same person as we wanted to find yesterday .
2、as引導非限制性定語從句，指代整個主句內容，從句可置于句首，句中或句尾。
例：As everyone knows ,China is a beautiful country with a long history .
3、非限制性定語從句中的謂語為被動式時，常用as做主語。
例：besaid/known/announced/reported/mentioned/expected/discussed
as引導限制性定語從句 篇3
關系代詞：在句中作主語、賓語或定語
1.that既可代表事物也可代表人，which代表事物；它們在從句中作主語或賓語,that在從句中作賓語時常可省略關系詞，which在從句中作賓語也可以省略。[eg：This is the book （which）you want.]
2.如果which在從句中作“不及物動詞+介詞”的介詞的賓語,注意介詞不要丟掉,而且介詞總是放在關系代詞which的前邊,但有的.則放在它原來的位置
3.代表物時多用which,但在下列情況中用that而不用which：
a)先行詞是anything,everything,nothing ,none等不定代詞時；
b)先行詞由every,any,all,some,no,little,few,much等修飾時,這時的that常被省略；
c)先行詞前有序數詞或被形容詞最高級修飾時；
d)先行詞中既有人又有物時；
e)整個句中前面已有which,who,that時；
f)當先行詞為物并作表語時；
g)先行詞為one時；
h)先行詞同時又被the only,the very,the same修飾時；
i)在there be句型中，句子的主語是先行詞,而且又是物
j)以here is開頭的句子
k）It is a high time+ 定語從句
4.who和whom引導的從句用來修飾人，分別作從句中的主語和賓語，whom作賓語時，要注意它可以作動詞的賓語也可以作介詞的賓語。
5.whose是關系代詞，修飾名詞作定語,相當于所修飾成分的前置所有格。它引導的從句可以修飾人和物，當它引導的從句修飾物體時，可以與 of which 調換，表達的意思一樣。
關系副詞
關系副詞：在句中作狀語
關系副詞=介詞+關系代詞
why=for which
where=in/ at/ on/ ...which (介詞同先行詞搭配)
when=during/ on/ in/ ...which (介詞同先行詞搭配)
where是關系副詞,用來表示地點的定語從句。
6.when引導定語從句表示時間[注]值得一提的是，表示時間“time"一詞的定語從句只用when引導，有時不用任何關系代詞,當然也不用that引導.
By the time when you arrived in London,we had stayed there for two weeks.到你到達倫敦的時候，我們在那里已經待了兩個星期。
I still remember the first time when I met her.我仍然記得我第一次見到她。
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,他帶來了生活必需品,如毛巾,肥皂,牙刷等其他東西。
7.當從句的邏輯主語是some,any,no,somebody,anybody,nobody,something,anything,everything或nothing時,常用there is 開頭。
There is somebody here who wants to speak to you.這里有人要和你說話。
非限制性定語從句的作用是對所修飾的成分作進一步說明,通常是引導詞和先行詞之間用逗號隔開,將從句拿掉后其他部分仍可成立。
as引導限制性定語從句 篇4
1.先行詞指物,在句中作主語或賓語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聳立，它是一百多年前建造的。)
注意：無論先行詞指人或者指物,在句中作主語或者作賓語，非限制性定語從句的引導詞都不能用that。
2.先行詞在句中作定語，無論指人或者指物,引導詞都用whose:
The girl,whose name is Kate,is the top of the students in our school.(那個女孩是我們學校最優秀的學生，她的名字叫Kate。)
The book,whose cover is red,is mine.(封面是紅色的那本書是我的。)
3.先行詞指人,在句中作主語who:
John,who is only five,has an inborn talent for music. (約翰是一外5歲大的孩子,有著天生的音樂才能。)
4.先行詞指人,在句中作賓語whom:
His wife,whom you met at my home,was a teacher.
(他的妻子，就是你在我家遇見的那個，是一位老師。)
5.先行詞指物，在句中作時間狀語用when：
The sports meeting will be put off till next month,when we will have made all the preparations.(運動會將被推遲到下個月，那時我們做好一切準備。)
6.The next day we arrived in New York,where we were inerviewed on the radio.(第二天我們到達紐約，在那里我們接受了電臺的采訪。)
7.如果先行詞作介詞的賓語，先行詞指人，介詞提前的結構是：介詞+whom;先行詞指物，介詞提前的結構是：介詞+which:
President Wilson,with whom he had not the same intimate relations,is treated much less sympathetically.(威爾遜總統與他沒有同樣的親密關系，所以就沒有被很同情地對待。) The Second World War,in which millions of people were killed,ended in 1945.(第二次世界大戰造成數百萬人的死亡，于1945年結束。)
8.as也可以引導定語從句，常與such連用：
Such people as you describe are rare nowadays.(象你所描繪的那種人現在已經很少見了。) Let's disscuss only such questions as concern us.(讓我們只討論那些和我們有關的問題吧。) 注意：the same that+從句，意思是：正是那一個人或物;the same as+從句，意思是：就像某個人或物：
He is the same man that you are looking for.(他就是你要找的那個人。)
He is the same man as you met in the street.(他很象你昨天在街上遇見的那個人。實際上并不是那個人。)
This is the same pen that I lost yesterday.(這就是我昨天丟失的那支筆。)
This is the same pen as I lost yesterday.(這很像昨天我丟失的那支筆。)
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