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限制性定語從句以及非限制性定語從句的區分、用法
根據定語從句與先行詞的關系，定語從句可分為限制性定語從句及非限制性定語從句。限制性定語從句緊跟先行詞，主句與從句不用逗號分開，從句不可省去；非限制性定語從句主句與從句之間有逗號分開，起補充說明作用，如省去，意思仍完整。以下是小編整理的限制性定語從句以及非限制性定語從句的區分、用法，一起來看看吧。
一、限制性定語從句
1.關系代詞that既可代表事物也可代表人，which只代表事物，它們在從句
中作主語或賓語。在從句中作賓語時常可省略。
I was the only person in our office that was invited to the palace ball．
The present that（which）I received last week was from my sister．
This is a book which is about space rocket technology．
2.關系代詞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。如：
This is the man who helped me．
The doctor whom you are looking for is in the room．
3. whose是關系代詞，修飾名詞，作定語，相當于who和whom的所有格，既可以修飾人又可以修飾物。如：
Do you know the student whose name is Wang Fei？
We lived in a room whose window opens to the west.
4. where是關系副詞，用來引導表示地點的定語從句，where在從句中作狀語。如：
At last we arrived at a small village where we’ll work for a week.
5. when是關系副詞，引導定語從句表示時間，在從句中作狀語。
注意，表示時間的the time，the day, the moment作先行詞，其定語從句引導詞有四種情況：1）when,2) in/ on which3) that4)省略。如：
By the time you arrive in London, we will have stayed there for two weeks.
I still remember the day I met her.
Each time he goes to business trip, he brings a lot of living necessities.
6. why是關系副詞，引導定語從句表示原因，在從句中作狀語。
7.關系副詞when, where, why可以用“介詞+關系代詞”結構代替，但有兩點要注意：
1）在“介詞+關系代詞”結構中，不能用that。關系代詞指物用which,指人時用whom，不用who；且which和whom在這個結構中不能省略。如：
The plane in which we flew to Canada is very comfortable. (正確)
The plane in that we flew in to Canada is very comfortable.(錯誤)
2）在使用介詞+關系代詞引導的定語從句時，含有介詞的動詞短語一般不拆開使用，如：look for, look after, take care of等。如“This is the watch which/that I am looking for.”不可以改為“This is the watch for which I am looking.”
二、非限制性定語從句
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，通常和主句間用逗號隔開，將從句拿掉后其他部分仍可成立
1. which引導的非限定性定語從句，可用來說明前面整個句子的情況或主句的某一部分。如：
She heard a terrible noise，which brought her heart into her mouth．
David studies hard and is ready to help others，which is what his parents expect．
2.在非限制性定語從句中，不能用that，而用who, whom代表人，用which或as代表事物。關系代詞作定語時用whose。如：
He loved his parents deeply, both of whom are very kind to him.
In the basket there are quite many apples, which have gone bad.
There are forty students in our class in all, most of whom are from big cities.限
His mother, who loves him very much, is strict with him.
China, which was founded in 1949, is becoming more and more powerful.
限制性定語從句和非限制性定語從句有時表達的意義不同，試分析下面兩個句子的差別：
His brother who is now a doctor always encourages him to go to college.
他那當醫生的哥哥常鼓勵他要考上大學。（他還有其他的哥哥）
His brother, who is now a doctor, always encourages him to go to college.
他的哥哥是當醫生的，常鼓勵他要考上大學。（他只有一個哥哥）
3. as和which引導非限制性定語從句
as和which引導非限制性定語從句，有相同之處也有不同之處。具體情況是：
1）As和which都可以在定語從句中做主語或者賓語，代表前面整個句子。
He married her, as/which was natural.
He was honest, as/which we can see.
As we know, smoking is harmful to one's health. The sun heats the earth, which is very important to us.
As we know, smoking is harmful to one’s health.
As is know, smoking is harmful to one’s health.
2）as引導非限制性定語從句，可放在主句之前，或者主句之后，甚至可以
切割一個主句；which引導的非限制性定語從句只能放在主句之后。
As is known to all, China is a developing country.
He is from the south, as we can see from his accent.
John, as you know, is a famous writer.
He has been to Paris more than several times, which I don’t believe.注意：當主句和從句存在邏輯上的因果關系時，常用which
Tom was always late for school, which made his teacher angry.
3）the same… as；such…as是固定結構,意思是“和……一樣……。”如：
I have got into the same trouble as he (has).
I have never heard such a story as he tells.
He is not such a fool as he looks.
This is the same book as I lost last week.
注意：當先行次由the same修飾時，偶爾也用that引導定語從句，但是和由as所引導的定語從句意思不同。如：
She wore the same dress that she wore at Mary’s wedding.
她穿著她在瑪麗婚禮上穿過的一條裙子。
She wore the same dress as her young sister wore.
她穿著和她妹妹所穿的一樣的裙子。
區別：
區別一：形式不同
限定性定語從句主句和從句之間不用逗號隔開，口語中使用時也不停頓;而非限定性定語從句與主句之間通常有逗號隔開，口語中使用時有停頓。
區別二：功能不同
限定性定語從句用于對先行詞的意義進行修飾、限制和識別，如果去掉，就會造成句意不完整或概念不清;而非限定性定語從句用于對先行詞起補充說明作用，如果省略，句意仍然清楚、完整。如：
People who take physical exercise live longer。 進行體育鍛煉的人活得長些。（若把從句去掉句子就失去意義）
His daughter， who is in Boston now， is coming home next week。 他女兒現在在波士頓，下星期回來。（若把從句去句子意義仍然完整）
區別三：翻譯不同
在翻譯定語從句時，一般把限定性定語從句翻譯在它所修飾的先行詞之前，而把非限定性定語從句與主句分開。如：
He is the man whose car was stolen。 他就是汽車被竊的那個人。
I’ve invited Jim， who lives in the next flat。 我邀請了吉姆，他就住在隔壁。
區別四：含義不同
比較下面的兩個句子：
I have a sister who is a doctor。 我有一個醫生的姐姐。（姐姐不止一個）
I have a sister， who is a doctor。 我有一個姐姐，她是當醫生的。（只有一個姐姐）
區別五：先行詞不同
限定性定語從句的先行詞只能是名詞或代詞，而非限定性定語從句的先行詞則可以是名詞或代詞，也可以是短語或句子;另外，當先行詞為專有名詞或其他具有獨一無二性的普通名詞時，通常要用非限制性定語從句，而不用限制性定語從句。如：
Peter drove too fast， which was dangerous。 彼得開車很快，這是很危險的。（which指drive too fast）
He changed his mind， which made me very angry。 他改變了主意，這使我很生氣。（which指整個主句）
Mr。 Smith， who is our boss， will leave for Japan next week。 我們的老板史密斯先生下周要去日本。（先行詞為專有名詞，要用非限制性定語從句修飾）
Her father， who has a lot of money， wishes her to study abroad。 她父親很有錢，希望她出國讀書。（先行詞為表獨一無二意義的普通名詞，要用非限制性定語從句修飾）
區別六：關系詞不同
關系詞that和why可用于限制性定語從句中，通常不用于非限制性定語從句;另外，在限制性定語從句中，關系詞有時可以省略（參見本章有關內容），而在非限制性定語從句中關系詞一律不省略。
語法專項練習
單項填空
1. The soldier ran to the building, and ____flew a flag.
A. on the top of whichB. on the top of whom
C. on the top of itD. which
2. When the same man ____murdered the old lady entered the hotel once more,
the waiter immediately phoned the police.
A. asB. thatC. whichD. whom
3. He wore, ____was very common at the time, a black jacket.
A. thatB. whichC. itD. what
4. Was it in the room ____Mr. Johnson lived ____the exhibition was held?
A. that; thatB. where; thatC. where; whereD. that; where
5. ____, the population of China is the largest in the world.
A. It is known thatB. As is well known
C. Which is well knownD. We all know that
6. This is the very reason____ he gave me.
A. thatB. whyC. for whichD. which
7. He arrived in New York in 1949, ____, some time later, he became a writer.
A. whenB. whereC. thatD. which
8. They’re talking about the newly opened market, ____you get all ____you need.
A. in which; whichB. where; thatC. where; whichD. which; that
9. She heard a terrible noise, ____brought her heart into her mouth.
A. itB. whichC. thisD. that
10. I said nothing, ____made her angry.
A. whichB. whatC. /D. that
11. I shall never forget the time ____the blacks and whites were fighting side by side.
A. whenB. thatC. /D. A, B and C
12. He has three sons, ____are doctors.
A. two of whomB. both of whomC. all of themD. each of them
13. He tore up my photo, and____ made me angry.
A. thatB. whatC. whichD. who
14. I still remember the sitting-room____ my mother and I sat in last year.
A. whereB. in whichC. thatD. to which
15. The day we looked forward to ____.
A. comeB. comingC. having comeD. has come
答案
1. C。由于and的存在，這是并列句，而不是非限制性定語從句，排除A.
2. B。這里the same修飾man，其后只能用能代表人的關系代詞that引導定語從句；whom是賓格，這里引導詞要在從句中作主語，故不能用。
3. B。which引導一個非限制性定語從句，which所代表的是整個主句的意思，為了強調從句而提前了。
4. B。識別強調句型不難，但極有可能在第一個空填that,而誤選D。其實被強調的部分還含有一個定語從句，修飾room.
5. B。只有as引導的非限制性定語從句可位于主句之前，排除C；若去掉句中的逗號，A項則可構成含有主語從句的復合句，D項則可構成含有賓語從句的復合句。
6. A。強干擾項是B.這里不選why，是因為定語從句缺的是賓語，故用關系代詞that.試比較：This is the reason why he gave me so much money;先行詞已被very一類的詞修飾過了，其后定語從句不用which引導，故亦排除D.
7. B。強干擾項是A.想當然地認為定語從句先行詞是時間，事實上，這個非限制性定語從句所修飾的先行詞是地點New York,被介詞結構分隔了。
8. B。where引導非限制性定語從句，在該定語從句中，不定代詞all又帶that引導的限制性定語從句。
9. B。從句子結構看，這是個主從復合句，故不用it和this;引導非限制性定語從句不用that.
10. A。如果只想當然地認為nothing是不定代詞，其后的定語從句要用that引導，就錯了。這里是一個非限制性定語從句，應該用which引導，并且which所代表的是整個主句的意思。
11. D。英語中少數幾個與時間有關的名詞，如the time, the day, the moment作先行詞，所帶定語從句的引導詞可用that代替when,也可以省略。
12. A。如果看出這是個定語從句，C、D很容易排除。Both of whom中的whom指兩個，數量是2/2；two of whom, whom指三人，數量是2/3.
13. A。強干擾項是C,因為有and，這是并列句,不是非限制性定語從句。這里that是指示代詞，作主語。
14. C。如果錯誤地把后面的介詞in理解為in last year,可能誤選A、B.事實上，in與前邊的關系代詞that引導定語從句。Last year是名詞詞組作時間狀語，不加冠詞。
15. D。這里“(that/which) we looked forward to”是修飾the day的定語從句；to的賓語是省略了的引導詞。
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