高中限制性定语从句及非限制性定语从句概念区别及练习 含答案
高中限制性定语从句及非限制性定语从句概念区别及练习 含答案
导入练习11.—Is that the small company you often refer to?—Right, just the one _______ you know my father used to work for years.that B.which C.where D.As2.—Where did they fi nish the experiment?—It was in the lab _______ was taken charge of by Prof.Smith.A.whereB./C.whichD.in which3.Examination compositions, together with most business letters and government reports, are the main situations _______ formal language is used.A.in whichB.in thatC.of whichD.of that4.Which fi lm is the one _______ main actor has won the Best Actor Prize in the fi lm festival?A.whoB.whomC.whoseD.which5.In that country, November 30th is a national festival _______ everyone, men and women, old and young, sings and dances happily in the streets.A.whereB.whenC.thatD.as6.This is John Brown, _______ I think has something interesting to tell you.A.whichB.whomC.thatD.who7.We climbed the Huangshan Mountain yesterday, _______, not surprisingly, was crowded with visitors from all over the world.A.whereB.whichC.thatD.when8.The famous football player, _______ a big party will be held tomorrow morning, is to arrive this afternoon.A.in honour of himB.in his honourC.in whose honourD.in which honour9._______ was reported in the newspaper, seventeen passengers had been killed in the traffi c accident.A.ItB.AsC.WhatD.That10.The owner paid the worker $10 for tidying the whole building, most of _______ hadn’t been cleaned for at least a year.A.thatB.whatC.whenD.which11.He has made great contributions to the science of physics, _______ he was awarded the 2021 Nobel Prize.A.about whichB.whatC.for whichD.when12.I don’t want to use the same tool _______ you used yesterday to repair the air conditioner.A.itB.thatC.oneD.what13.They were interested _______ you told them.A.in whichB.in thatC.all thatD.in everything14.Is that the reason _______ you are in favor of the proposal?A.whichB.whatC.whyD.for that15.I have bought the same dress _______ she is wearing.A.asB.thatC.whichD.what限制性定语从句提供有关主语或宾语的重要信息, 起限定作用, 与被修饰局部的关系严密, 如果省略该从句会使主句语义表达不完整。
英语中限制性定语从句和非限制性定语从句讲解和练习
定语从句讲解和练习一、概念: He is the boy who often goes to school late.先行词关系词定语从句They have a clever son.Do you know the man over there?I know the man who wrote the book.二、原则： a.定语从句必须紧紧地跟在先行词后面，限制修饰先行词。
b.定语从句必须用关系词来引导。
c.关系词在定语从句中作一个句子成分.三、扩大. She is the old woman whom I saw this morning.Mary is the girl whose parents work in Japan.Is this the key which you are looking for?October 1, 1949 is the day when New China was founded.This is the house where the great man was born.I don’t know the reason why she looks unhappy today.四、下列定语从句只能用that来引导：1.先行词为形容词最高级所修饰This is the longest bridge that I have ever seen.2.先行词为序数词所修饰This is the first composition that he has ever written in English.3.先行词既包括人又包括物They talked of things and persons that happened in the school.He talked about the teachers and schools that he had visited.4.主句是who或which开头的特殊疑问句中的定语从句Who is the man that came this morning?Which is the bag that you lost?5.先行词为the only, the very, the last, the same所修饰的定语从句He is the very person that the police are looking for.This is the only thing that I can remember.6.先行词是everything, nothing, something, all, little, much,everybody等不定代词Tell us everything that you know, please.Is there anything that you don’t understand?7.先行词被all, every, no, some, any, little, much修饰时All that glitters is not gold.I’ve read all the books that you gave me.五、只用which 情况有两种情况：1、非限制性定语从句，关连词要用which；2、做介词宾语时只能用which。
限制性定语从句以及非限制性定语从句的区分、用法
限制性定语从句以及非限制性定语从句的区分、用法限制性定语从句以及非限制性定语从句的区分、用法根据定语从句与先行词的关系，定语从句可分为限制性定语从句及非限制性定语从句。
限制性定语从句紧跟先行词，主句与从句不用逗号分开，从句不可省去；非限制性定语从句主句与从句之间有逗号分开，起补充说明作用，如省去，意思仍完整。
以下是店铺整理的限制性定语从句以及非限制性定语从句的区分、用法，一起来看看吧。
一、限制性定语从句1.关系代词that既可代表事物也可代表人，which只代表事物，它们在从句中作主语或宾语。
在从句中作宾语时常可省略。
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.关系代词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。
如：This is the man who helped me．The doctor whom you are looking for is in the room．3. whose是关系代词，修饰名词，作定语，相当于who和whom 的所有格，既可以修饰人又可以修饰物。
如：Do you know the student whose name is Wang Fei？We lived in a room whose window opens to the west.4. where是关系副词，用来引导表示地点的定语从句，where在从句中作状语。
如：At last we arrived at a small village where we’ll work for a week.5. when是关系副词，引导定语从句表示时间，在从句中作状语。
高中英语限制性定语从句和非限制性定语从句有四大区别及练习华师大版
限制性定语从句和非限制性定语从句有四大区别;一、在句中作用不同限制性定语从句对被修饰的先行词有限定制约作用;使该词的含义更具体;更明确..限制性定语从句不能被省略;否则句意就不完整..非限制性定语从句与先行词关系不十分密切;只是对其作一些附加说明;不起限定制约作用..如果将非限制性定语从句省去;主句的意义仍然完整..二、外在表现形式不同限制性定语从句因与先行词关系密切;所以不可以用逗号将其与主句隔开；而非限制性定语从句与先行词关系不十分密切;所以可用逗号将其与主句隔开..例1. This is the place where he used to live.例 2. Mr. Zhang;who came to see me yesterday;is an old friend of mine.在例 1中;定语从句与先行词关系密切;为限制性定语从句;不可用逗号将其与主句隔开..在例2中;定语从句与先行词关系不密切;为非限制性定语从句;可用逗号将其与主句隔开..三、先行词内容有所不同大多数限制性和非限制性定语从句的先行词往往为某一个词或短语;而特殊情况下非限制性定语从句的先行词也可为整个主句;此时非限制性定语从句常由 which 引导..例：1. A middle-aged woman killed her husband;which frightened me very much.由语境可知;令“我”恐惧的内容应为“中年女子杀害了自己的丈夫”这整个一件事;因此先行词为整个主句;此时应由 which 引导定语从句..例：2. A five-year-old boy canspeak two foreign languages; which surprises all the people present.由语境可知;令所有在场的人感到惊讶的内容是“一个五岁男孩会讲两门外语”这整个一件事;因此先行词为整个主句;此时应由 which 引导非限制性定语从句..四、关系词的使用情况有所不同一 that 不可用于引导非限制性定语从句所有关系代词和关系副词均可引导限制性定语从句;大多数关系代词和关系副词可引导非限制性定语从句;但 that 不可..例如：他没通过这次考试;令我很失望..误：He didn't pass the exam;that disappointed me.正：He didn't pass the exam;which disappointed me.值得注意的是;不少同学误认为只有 which 才能引导非限制性定语从句;这个观点是不正确的..使用非限制性定语从句时;如果先行词指人;则用 who ; whom或 whose 引导非限制性定语从句；先行词指物可用 which 引导非限制性定语从句；先行词表时间或地点且在从句中作时间状语或地点状语时;可用when;where 引导非限制性定语从句..例1. We'll graduate in July;when we will be free.例2. Last Sunday they reached Nanjing;where a conference was to be held.二关系代词替代情况不同关系代词 whom 在限制性定语从句中作宾语时可用 who 代替 whom ;但 whom 在非限制性定语从句中作宾语时不可用 who 来代替..例: 1. This is the girl whom I met in the street.先行词 the girl 在限制性定语从句中作宾语;可用 who 代替whom .例: 2. A young man had a new girl friend;whom he wanted to impress.先行词 a new girl friend 在非限制性定语从句中作宾语;不可用 who 代替 whom .在限制性定语从句中;先行词指人时可用 that 代替 who/ whom ;但在非限制性定语从句中先行词指人时;不可用 that 代替who/whom .例：她有一个姐姐;她是教师..误： She has a sister;that is a teacher.正：She has a sister;who is teacher.三关系代词省略情况不同关系代词在限制性定语从句中作宾语时可以省去;非限制性定语从句的所有关系词均不可省..例 1. This is the bookwhich/thathe lost yesterday.先行词 the book 在限制性定语从句中作宾语;关系代词 which 或 that 可以省略..例 2. The book; which he lost yesterday; has been found.先行词 the book 在非限制性定语从句中作宾语;关系代词which 不可省..四as引导定语从句时的用法① as引导限制性定语从句通常用于the same … as; such … as 结构中..e.g. I want the same shirt as my friend’s.Such machines as are used in our workshop are made in China. 我们车间使用的这种机器是中国制造的..② as引导非限制性定语从句既可放在主句之前;也可放在主句之后;用来修饰整个句子..通常用下列句型：as is known to all; as is said; as is reported; as is announced; as we all know; as I expect 等..e.g. As I expected; he got the first place again in this mid-term examination.3as 引导非限制性定语从句时与which的区别① 当主句和从句语义一致时;用as；反之;用which来引导非限制性定语从句..e.g. He made a long speech; as we expected.He made a long speech; which was unexpected.② 当非限制定语从句为否定时;常用which引导..e.g. Tom drinks a lot every day; which his wife doesn’t likeat all.2. 定语从句有时不直接紧靠先行词;中间由一个定语、状语或谓语隔开..这种定语从句叫做分隔性定语从句e.g. There is an expression in his eyes that I can’t understand.4. 引导定语从句的关系副词有时可以用“介词+ which”来代替..e.g. October 1; 1949 was the day on which = when the People’s Republic of China was founded.5. 当定语从句中谓语动词是带介词或副词的固定短语动词时;短语动词的各个固定部分不要拆开..e.g. The sick man whom she is looking after is her father.6. 介词在关系代词前;只能用which和whom;且不能省略；介词在句尾;关系代词可以省略..定语从句练习、一、把下列每对句子合并成含有定语从句的主从复合句：1. The fan is on the desk. You want it.2. The man is in the next room. He brought our textbooks here yesterday.3. The magazine is mine. He has taken it away.4. The students will not pass the exam. They don’t study hard.5. The woman is our geography teacher. You saw her in the park.6. The letter is from my sister. I received it yesterday.7. The play was wonderful. We saw it last night.8. The train was late. It was going to Nanning.9. The boy is my brother. He was here a minute ago.10. The tree is quite tall. He is climbing it.11. Here is the girl. Her brother works in this shop.12. That’s the chi ld. We were looking at his drawing just now.13. This is the boy. His sister is a famous singer.14. I want to talk to the boys. Their homework haven’t been handed in.15. Is that the woman Her daughter is in my class.16. He used to live in a big house. In front of it grew many banana trees.17. They passed a factory. At the back of the factory there were rice fields.18. The soldier ran to the building. On the top of it flewa flag.19. In the evening they arrived at a hill. At the foot of the hill there was a temple.20. She came into a big room. In the middle of it stood a large table.二、根据句子意思;用介词＋关系代词whom或which 完成下列句子.1. The person ________ ________ I spoke just now is themanager that I told you about.2. The pencil ________ ________ he was writing broke.3. Wu Dong; ________ ________ I went to the concert; enjoyed it very much.4. The two things ________ ________ Marx was not sure were the grammar and some of the idioms of English.5. Her bag; ________ ________ she put all her books; has not been found.6. The stories about the Long March; ________ ________ thisis one example; are well written.三、选择填空：1. The man ____ visited our school yesterday is from London.A. whoB. whichC. whomD. when2. The woman ____ is talking to my mother is a friend of hers.A. whoseB. whoC. whomD. which3. Because of my poor memory; all ____ you told me has been forgotten.A. thatB. whichC. whatD. as4. Do you remember those days ____ we spent along the seashore very happilyA. whenB. whereC. whichD. who5. Tom t took away the camera because it was just the samecamera ____ he lost last week.A. whichB. thatC. whomD. as6. Those ____ want to go please sign their names here.A. whomB. whichC. whoD. when7. Where is the man ____ I met this morningA. whenB. whereC. whichD. who8. Who is the woman ____ is sweeping the floor over thereA. whoB. /C. thatD. when9. The man ____ you talked just now is a worker.A. whoB. whomC. to whomD. to who10. The man ____ you are going to make friends is my father’s neighbour.A. with whomB. whenC. to whomD. which11. The doctor ____ is leaving for Africa next month.A. the nurse is talking to himB. whom the nurse is talkingC. the nurse is talking toD. who the nurse is talking12. The man ____ around our school is from America.A. which you showedB. you showed himC. you showedD. where you showed13. He talked about a hero ____ no one had ever heard.A. of whomB. from whomC. about thatD. who14. In fact the Swede did not understand the three questions____ were asked in French.A. whereB. whoC. in whichD. which15. Have you read the book ____ I lent to youA. thatB. whomC. whenD. whose16. Finally; the thief handed over everything ____ he had stolen to the police.A. thatB. whichC. whateverD. all17. The foreign guests; ____ were government officials; werewarmly welcomed at the airport.A. most of themB. most of thatC. most of whomD. most of those18. This is the very letter ____came last night.A. whoB. whichC. thatD. as19. I know only a little about this matter; you may ask ____ knows better than I.A. whoeverB. whomeverC. anyoneD. the one20. This is the school ____ we visited three days ago.A. whereB. /C. whenD. what21. This is the factory ____ we worked a year ago.A. whereB. thatC. whichD. on which22. Nearby were two canoes ____ they had come to the island.A. whichB. in whichC. thatD. /23. Jack is pleased with ____ you have given him and all ____ you have told him.A. that; whatB. what; thatC. which; whatD. that; which24. Do you work near the building ____ colour is yellowA. thatB. whichC. itsD. whose25. In the dark street; there wasn’t a single person ____ she could turn for help.A. whomB. whoC. to whomD. form whom26. Is this school ____ we visited three years agoA. the oneB. whichC. thatD. where27. Is this the school ____ we visited three years agoA. the oneB. whereC. in whichD. /28; How many students are there in your class ____ homes are in the countryA. whoseB. whoC. whomD. which29. Alice received an invitation from her boss; ____ cameas a surprise.A. itB. whichC. thatD. he30. The train was crowded and I had to get into a carriage____ already seven other people.A. when there wereB. which there wereC. that there wereD. where there were31. I live in the house ____ windows face south.A. whichB. whoseC. whereD. that32. ---- What game is popular with them---- The ____ most is tennis.A. game they like itB. game they likeC. best game they likeD. best game they like it33. They stayed with me three weeks; ____ they drank all the wine I had.A. whichB. which timeC. during whichD. during which time34. The room ____ Mr White lives is not very large.A. thatB. whichC. whereD. when35. Don’t forget the day ____ you were received into theYouth League.A. whenB. thatC. at whichD. where36. I’ve finished writing the novel; ____ is to be published next month.A. thatB. whatC. whichD. when37. He returned home safe and sound after a fierce battle; ____ was unexpected.A. whichB. asC. thatD. it38. ____ is known to all; English is not very difficult to learn.A. WhatB. AsC. ThatD. Which39. The old man had three sons; all of ____ died during World War Ⅱ.A. whoseB. thatC. whomD. who40. I have bought two pens; ____ write well.A. none of whichB. neither of whichC. both of whichD. all of which41. Do you know the reason ____ she has changed her mindA. whyB. whichC. for thatD. of which42. He failed in the exam; ____ proves that he wasn’t working hard enough.A. whichB. whatC. itD. that43. During the week ____ he tried to collect materials for his article.A. followingB. followedC. to followD. that followed44. ____ was expected; he succeeded in the exam.A. ItB. WhichC. AsD. That45. He studied hard and later became a well-known writer; ____ his father expected.A. that was whatB. what was thatC. and which wasD. which was what46. We should read such books ____ will make us better and wiser.A. whenB. asC. whoseD. what47. You must show my wife the same respect ____ you show me.A. whenB. asC. whoseD. what48. He is absent; ____ is often the case.A. whatB. whichC. whoD. as49. It is the first time ____ I have come to your city.A. thatB. whichC. whatD. when50. Who ____ has the same idea as it will do it in this way.A. whoB. thatC. whomD. which51. I shall never forget those years ____ I lived in thecountry with the farmers; ____ has a great effect on my life.A. that; whichB. when; whichC. which; thatD. when; who52. This is the only book ____ I can find.A. thatB. whichC. itD. with which53. I don’t like ____ you speak to her.A. the wayB. the way in thatC. the way whichD. the way of which54. That is one of those books that ____ worth reading.A. isB. areC. hasD. have55. This is the only one of the students whose handwriting ____ the best.A. isB. areC. hasD. have定语从句参考答案一、1. The fan that you want is on the desk.2. The man who brought our textbooks here yesterday is in next room.3. The magazine which he has taken away is mine.4. The students who don’t study hard will not pass the exam.5. The woman you saw in the park is our geography teacher.6. The letter I received yesterday is from my sister.7. The play that we saw last night was wonderful.8. The train which was going to Nanning was late.9. The boy who was here a minute ago is my brother.10. The tree he is climbing is quite tall.11. Here is the girl whose brother works in this shop.12. That’s the child whose drawing we were looking at just now.13. This is the boy whose sister is a favous singer.14. I want to talk to the boy whose homework hasn’t beenhanded in.15. Is that the woman whose daughter is in my class16. He used to live in a big house; in front of which grew many banana trees.17. They passed a factory; at the back of which there were rice fields.18. The soldier ran to the building; on the top of which flewa flag.19. In the evening they arrived at a hill; at the foot of which there was a temple.20. She came into a big room; in the middle of which stooda large table.二、1. to whom; 2. wiht which; 3. with whom;4. about which;5. in which;6. of which三、1~5 ABACD 6~10 CDCCA 11~15 CCADA 16~20 ACCAB21~25 ABBDC 26~30 ADABD 31~35 BBDCA 36~40 CABCC 41~45 AADCD 46~50 BBDAB 51. BAABA。
限制性定语从句和非限制性定语从句的区别
Practice A
• 1. 2. 请区分出下列句子哪些是限制性定语从句， 那些是非限制性定语从句： The teacher told me that Tom was the only person that I could depend on. His mother, who loves him very much, is strict with him. China is a country which has a long history. China, which was founded in 1949, is becoming more and more powerful.
A、who
B、who want
C、what wants
D、want
7、His walking stick, ____ he can’t
walk, was lost yesterday. A、that
D
B、with which
C、which D、without which
8、They have decided to finish their
C、which
D、where
B
C. that D. the one which
5、This is the factory_______we visited
last year.
A
A、that
B、 in which
C、what
D、the one
解析：the factory是定语从 句的先行词, 用作宾语； 从句we visited last year中 visit是个及物动词，后接 宾语，因此选A.
形式上
意义上
译法上
高考英语语法复习之限制性定语从句和非限制性定语讲义
高中英语语法复习之限制性定语从句和非限制性定语定义和用法在英语语法中，定语从句是用来修饰名词或代词的句子成分，通常分为限制性定语从句和非限制性定语从句两种。
限制性定语从句和非限制性定语从句是英语语法中两个重要的概念。
限制性定语从句是指用来修饰一个名词或代词的从句，这个从句在句子中充当定语的作用，对名词或代词起限定、说明的作用。
与之相反，非限制性定语从句通常用来进一步说明被修饰的名词或代词，起到补充说明的作用，它不能充当主语、宾语等成分，并且通常可以被省略。
限制性定语从句通常由that、which、who、whom、whose等引导词引导，也可以由as、when、where、why等引导词引导。
限制性定语从句通常与主句之间需要用逗号隔开，而且通常放在主句之后。
例如:The book, which I read last week, is really interesting.(限制性定语从句)The man, who is a doctor, can help you.(限制性定语从句)非限制性定语从句则没有这些限制，它可以充当主语、宾语、表语、定语等成分，并且通常可以被省略。
非限制性定语从句通常由that、which、who、whom、whose等引导词引导，也可以用as、when、where、why等引导词引导。
例如:The book, that I read last week, is really interesting.(非限制性定语从句)The man, who is a doctor, can help you.(非限制性定语从句)需要注意的是，非限制性定语从句和限制性定语从句在句子中的作用不同，因此需要根据具体情况来选择合适的定语从句类型。
限制性定语从句是先行词在定语从句中充当主语或宾语，对先行词起修饰和限制作用，二者缺一不可。
限制性定语从句和非限制性定语从句是英语语法中的两个重要概念。
语法规则：如何区别限制性定语从句和非限制性定语从句
限制性定语从句和非限制性定语的区别定语从句可分为两类：限制性定语从句和非限制性定语从句。
那么，两者之间有何区别呢？下面笔者结合近几年的高考题分析二者的不同点。
一、含义有所不同限制性定语从句表示所谈的是哪个人及哪件事。
比如说‘I met the man’所指何人不清楚，因此要说‘I met the man who lives next door’。
而非限制性定语从句对所谈的人、物或群体只提供进一步的信息，无需对他们加以确定。
比如说‘I saw Michael Jordan’时，很清楚指的是谁。
但若要进一步说明Michael Jordan，则可说‘I saw Michael Jordan, who is the greatest NBA star’。
请比较以下例句：1.A person whose e-mail account is full won’t be able to send or receiveany e-mails. （限制性定语从句）2.Many children,whose parents are away working in big cities, are takengood care of in the village.（非限制性定语从句）3.Some pre-school children go to a day-care center,where they learnsimple games and songs.（非限制性定语从句）4.Mozart’s birthplace and the house where he composed ‘The MagicFlute’are both museums now.（限制性定语从句）二、标点有所不同限制性定语从句前后绝不用逗号或破折号；而在句子中间，非限制性定语从句的前、后都用逗号，但在主句后面时，在从句句末用句号。
破折号有时也可用来代替逗号。
高中英语课件-限制性定语从句和非限制性定语从句的区别
区别一：形式上不同
限定性定语从句主句和从句之间不 用逗号隔开，口语中使用时也不停 顿；而非限定性定语从句与主句之 间通常有逗号隔开，口语中使用时 有停顿。
区别二：功能不同（最重要的区别） 限定性定语从句用于对先行词的意义进行限制和
识别，如果去掉，就会造成句意不完整或概念不 清； 而非限定性定语从句用于对先行词起补充说明作 用，如果省略，句意仍然清楚、完整。 People who take physical exercise live longer. 进行体育锻炼的人活得长些。(若把从 句去掉句子就失去意义) His daughter, who is in Boston now, is coming home next week. 他女儿现在在波士顿， 下星期回来。(若把从句去句子意义仍然完整)
year, occasion
Where Place, spot,
地点 状语
point, stage,
position, policy,
point, condition,
street, occasion,
cases,
situation
why reason
原因 状语
There is one point where I’d like your advice. 有一点，我想听听你的建议。
There are cases where this rule does not hold good. 在一些情况下，这个规则是不适用的。 This company has now introduced a policy where pay rises are related to performance at work. 这家公司引进一种政策：薪酬与工作表现 挂钩。
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导入练习11. —Is that the small company you often refer to?—Right, just the one _______ you know my father used to work for years.A.thatB. whichC. whereD. As2. —Where did they fi nish the experiment?—It was in the lab _______ was taken charge of by Prof. Smith.A. whereB. /C. whichD. in which3. Examination compositions, together with most business letters and government reports, are the main situations _______ formal language is used.A. in whichB. in thatC. of whichD. of that4. Which fi lm is the one _______ main actor has won the Best Actor Prize in the fi lm festival?A. whoB. whomC. whoseD. which5. In that country, November 30th is a national festival _______ everyone, men and women, old and young, sings and dances happily in the streets.A. whereB. whenC. thatD. as6. This is John Brown, _______ I think has something interesting to tell you.A. whichB. whomC. thatD. who7. We climbed the Huangshan Mountain yesterday, _______, not surprisingly, was crowded with visitors from all over the world.A. whereB. whichC. thatD. when8. The famous football player, _______ a big party will be held tomorrow morning, is to arrive this afternoon.A. in honour of himB. in his honourC. in whose honourD. in which honour9. _______ was reported in the newspaper, seventeen passengers had been killed in the traffi c accident.A. ItB. AsC. WhatD. That10. The owner paid the worker $10 for tidying the whole building, most of _______ hadn’t been cleaned for at least a year.A. thatB. whatC. whenD. which11. He has made great contributions to the science of physics, _______ he was awarded the 2009 Nobel Prize.A. about whichB. whatC. for whichD. when12. I don’t want to use the same tool _______ you used yesterday to repair the air conditioner.A. itB. thatC. oneD. what13. They were interested _______ you told them.A. in whichB. in thatC. all thatD. in everything14. Is that the reason _______ you are in favor of the proposal?A. whichB. whatC. whyD. for that15. I have bought the same dress _______ she is wearing.A. asB. thatC. whichD. what限制性定语从句提供有关主语或宾语的重要信息，起限定作用，与被修饰部分的关系紧密，如果省略该从句会使主句语义表达不完整。
例如：This is the very person that is wanted by the police.He is the man who /that lives next door.非限制性定语从句只是用来对被修饰部分作补充性的说明，与先行词关系比较松散，先行词与从句间可以用逗号隔开，从句可略去：The minister, who is to visit our university, is said to be a Qinghua University graduate.The businessman, whose suitcase has been found by a stranger, has left for Beijing.如果定语从句的先行词是专有名词或是带有形容词性物主代词(my, his, etc)或形容词性指示代词(this, that, etc)作限定词的名词词组，其后的定语从句通常为非限制性的。
例如：My mother, who has been on a visit to Australia, will fly back tomorrow..限制性定语从句的先行词只能是名词，代词或名词性词组，而非限制性定语从句的先行词除了是名词及名词性词组外，还可能是句子的一部分或是整个句子。
例如：They say he plays truant, which he doesn’t. [which指代plays truant]The meeting was put off till next month, as we hoped. [as指前面的句子]下面的表格归纳了前面已提到的两者不同之处：表一：限制性定语从句与非限制性定语从句的区别限制性定语从句非限制性定语从句1．提供确定或限定主句中某个名词的信息。
1．提供对确定主句中某个名词的非主要附加信息。
2．由深层嵌入句派生而来。
2．由两个独立的深层嵌入句派生而来。
3．无分隔定语从句和主句和停顿或特殊标点符号（逗号/插入语/破折号）。
3．书面语中用逗号，口语中用特殊的停顿和降低声调来把定语从句和主句分隔开来。
4．不可以修饰整个命题，只修饰一个名词。
4．可以修饰一个中心名词，或以评价的形式修饰整个命题。
5．可使用that和who(m),which等关系代词。
5．That不能当作关系代词，只可用wh-代词。
6．不常用来修饰专有名词。
6．既可修饰普通名词，也可修饰专有名词。
7．可修饰带有any 或every等类属限定词的中心名词。
7．不可修饰带有any 或every等类属限定词的中心名词。
as的用法1、as引导限制性定语从句时，常与such或the same连用，构成the same…as; such…as结构，as用于代替指人或物的先行词。
例如：I have never eaten such tasty foods as she cooked me.试比较the same…as和the same…that：This is the same book as I read last week.（这和我上周读的那本书是一样的。
）This is the same book that I read last year.（这就是我上周读的那本书。
）如果先行词表示抽象概念，则没有这种区别，例如：She told me the same story as/that she had told you.在as／so…as结构中，后面的as也是关系代词，例如：We took as many men as could be permitted to attend the meeting.2、引导非限制性定语从句关系代词as引导非限制性定语从句时，用于代替整个主句，意思是“正如”，相当于and this或and that。
as从句位置较之which引导的非限制性定语从句更加灵活，因而as从句既可以指前面提到的内容，也可以指后面将要提到的内容，which一般在主句后。
例如：The test is cancelled, as you have hoped.The test, as you have hoped, is cancelled.▲注：as代表前面的整个主句并在从句中做主语时表达的意思应与主句一致，而且从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.例如：He failed to pass the exam again, as is predicted.He failed to pass the exam again, which annoyed his mother greatly.记住以下的as结构：as is known to all (众所周知)，as is often the case (情况常常如此)，as the name Indicates／suggests (顾名思义)，as may be imagined (可以想象得出)，as often happens (这种情况常常发生)，as has been said before (如前所述)，as has been pointed out (正如已经指出的)，as will be shown in ( 将在…中指出)，as is hoped ( 正如所希望的)3 介词+ 关系代词“介词+ 关系代词”引导的定语从句既可以是限制性定语从句，又可以是非限制性定语从句，“介词+关系代词”在从句中做主语、宾语、状语、定语等，介词的选择则要根据它与其先行词的关系或前后名词、动词等的搭配关系来决定，同时还应该考虑句子在上下文中要表达的意思。