——定语从句
【复习目标】
▲掌握定语从句的意义及作用。
▲区别各类引导词。
【课前准备】
●要求学生用定语从句造五个句子。
【知识要点】
在复合句中 ， 修饰名词或代词的从句叫定语从句 ， 被修饰的名词或代词叫先行词 ， 引导定语从句的有关系代词 who, whom, whose, which, that等和关系副词where, when, why等 ， 关系代词和关系副词在定语从句中担任句子成份。
1.由who引导的定语从句中 ， who用作主语 ， 如 ： This is the boy who often helps me.
2.由whom引导的定语从句中，whom用作宾语，如：The man whom you are waiting for has gone home.
3.由whose引导的定语从句中 ， whose用作定语 ， 如 ： Do you know the girl whose skirt is white?
4.由which引导的定语从句中，which用作主语或谓语动词的宾语或介词的宾语，如：
The room in which there is a machine is a work shop.
The river which is in front of my house is very clean.
This is the pen which you want.
注意 ：
(1)whom, which用作介词宾语时 ， 介词可放在 whom、which之前 ， 也可放在从句原来的位置上；但在含有介词的动词固定词组中，介词只能放在原来的位置上。如： He is the very person whom we must take good care of.
(2)引导非限制性定语从句时，必须用关系代词which，不用that,如：I have lost
my bag, which I like very much.
(3)关系代词在句中作主语时，从句的谓语动词的人称和数必须和先行词保持一致。
5.由that引导的定语从句中，that可以指人或物，在从句中作主语或谓语动词的宾语，但不能放在介词后面作介词宾语，如：
The book that I bought yesterday was written by Lu Xun.
注意在下面几种情况下必须用 that引导定语从句。
(1)先行词是不定代词all, few, little, much, something, nothing, anything等 ， 如 ：
All that we have to do is to practise English.
(2)先行词被序数词或形容词最高级所修饰，如
The first letter that I got from him will be kept.
(3)先行词被all, any, every, each, few, little, no, some等修饰 ， 如
I''ve eaten up all the food that you gave me.
(4)先行词被the only, the very, the same, the last修饰时如
He is the only person that I want to talk with.
(5)先行词既有人又有物时，如:
They talked about persons and things that they met.
(6)当句中已有who时 ， 为避免重复 ， 如 ： Who is the man that is giving us the
class?
6.由when, where, why引导的定语从句，如:
I don''t know the reason why he was late.
This is the place where we have lived for 5 years.
I''ll never forget the day when I met Mr Li for the first time.
注意：先行词是表示地点时，如果从句的谓语动词是及物的，就用 that(which)，如果从句的谓语动词是不及物的，就用where引导。This is the house Which /that he has lived in for 15 years.(Where he has lived for 15 year.)
7. 限制性定语从句和非限制性定语从句
(1)限制性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号分开。引导非限制性定语从句的关系代词有who, whom, whose, which, of which等，这些关系代词都不能省略。
(2)非限制性定语从句是对主句先行词的补充说明 ， 没有这种从句 ， 不影响主句意思的完整 ， 一般用逗号把主句和从句分开 ， 关系代词用 which,不用that;指人时可用who,如 ： I have two brothers, who are both students.
8．如何简化定语从句
（1）.定语从句简化为形容词或形容词短语作后置定语。如:
My grandfather lives in a village that is far away from here.
→My grandfather lives in a village far away from here.我祖父住在离这儿很远的一个村子。
This is a book that is worth reading.
→This is a book worth reading. 这是一本值得看的书。
（2） 定语从句简化为现在分词或现在分词短语作前置或后置定语。
The man who is standing under the tree is our English teacher.
→The man standing under the tree is our English teacher.
站在树下面的那个人是我们的英语老师。
I saw the house that was burning at that time.→I saw the burning house at that time.
当时我看到那房子在燃烧。
（3）定语从句简化为过去分词短语作后置定语。
I like to see the films which are directed by Zhang Yimou.→I like to see the films directed by Zhang Yimou. 我喜欢看张艺谋导演的电影。
She is the girl who was praised at the school meeting.→She is the girl praised at the school meeting. 她就是在校会上受表彰的那个女孩。
（4）定语从句简化为不定式作后置定语。
He is always the first person that comes to school.→He is always the first person to come to school.他总是第一个到校。
The report which will be given tomorrow is important to us.→The report to be given tomorrow is important to us. 明天要作的报告对我们很重要。
（5）定语从句简化为what 从句。
I couldn''t remember the words that he said.→I couldn''t remember what he said.
我记不得他说的话。
【典型例题解析】
例 1 The second book ______I want to read is Business @ the Speed of Thought.
A. which B. what C. that D. as
解析 先行词 book被序数词修饰时要用that引导定语从句，故选C。
例 2 I''ll never forget the days _____I stayed with you.
A. when B. in which C. that D. for which
解析 本题指时间，故选 A。
例 3 The book______ is sold out at the moment.
A. you need B. what you need
C. which you need it D. that you need it
解析 B、C、D中的what和it与先行The book相抵触 ， 故选 A。
例 4 Is this the place ______Lincoln once lived.
A. that B. which C. where D. when
解析 本题指地点，故选 C。
例 5 I''m one of the boys _________ never late for school.
A. that is B. who are C. who am D. who is
解析 本题中 who用作主语，谓语动词与先行词the boys保持一致，故选B。
【选讲例题】
例 6 Her sister,______ you met at my home, was a teacher of English.
A. whom B. that C. which D. who is
解析 非限制性定语从句中 ， 关系代词用 which,不用that,但指人时用who或whom.故选A。
例 7 These book are for students _____ mother language is not English.
A. of whom B. that C. which D. whose
解析 whose引导的定语从句中,whose用作定语，故选D。
定语从句专项练习及详解
1.The place _______interested me most was the Children's Palace.
A. Which B. where C. what D. in which
2.Do you know the man _______?
A. whom I spoke B. to who spoke C. I spoke to D. that I spoke
3.This is the hotel _______last month.
A. which they stayed B. at that they stayed
C. where they stayed at D. where they stayed
4.Do you know the year ______the Chinese Communist Party was founded?
A. which B. that C. when D. on which
5.That is the day ______I'll never forget.
A. which B. on which C. in which D. when
6.The factory ______we'll visit next week is not far from here.
A. where B. to which C. which D. in which
7.Great changes have taken place since then in the factory _______we are working.
A. where B. that C. which D. there
8.This is one of the best films _______.
A. that have been shown this year B. that have shown
C. that has been shown this year D. that you talked
9.Can you lend me the book ______the other day?
A. about which you talked B. which you talked
C. about that you talked D. that you talked
10.The pen ______he is writing is mine.
A. with which B. in which C. on which D. by which
11.They arrived at a farmhouse, in front of ______sat a small boy.
A. whom B. who C. which D. that
12.The engineer ______my father works is about 50 years old.
A. to whom B. on whom C. with which D. with whom
13.It there anyone in your class ______family is in the country?
A. who B. who's C. which D. whose
14.I'm interested in ______you have said.
A. all that B. all what C. that D. which
15.I want to use the same dictionary ______was used yesterday.
A. which B. who C. what D. as
16.He isn't such a man ______he used to be.
A. who B. whom C. that D. as
17.He is good at English, ______we all know.
A. that B. as C. whom D. what
18.Li Ming, ______to the concert enjoyed it very much.
A. I went with B. with whom I went C. with who I went D.I went with him
19.I don't like ______ as you read.
A. the novels B. the such novels C. such novels D. same novels
20.He talked a lot about things and persons ________they remembered in the school.
A. which B. that C. whom D. what
21.The letter is from my sister, ______is working in Beijing.
A. which B. that C. whom D. who
22.In our factory there are 2,000 workers, two thirds of ____are women.
A. them B. which C. whom D. who
23.You're the only person ______I've ever met ______could do it.
A. who;/ B./; whom C. whom;/ D./; who
24.I lost a book, ______I can't remember now.
A. whose title B. its title C. the title of it D. the title of that
25.Last summer we visited the West Lake, ______Hangzhou is famous in the world.
A. for which B. for that C. in which D. what
26.I have bought such a watch _______ was advertised on TV.
A. that B. which C. as D. it
27.I can never forget the day _______ we worked together and the day ______ we spent together.
A. when; which B. which; when C. what; that D. on which; when
28.The way ______he looks at problems is wrong.
A. which B. whose C. what D./
29.This is the reason ______he didn't come to the meeting.
A. in which B. with which C. that D. for which
30.This machine, ______for many years, is still working perfectly.
A. after which I have looked B. which I have looked after
C. that I have looked after D. I have looked after
31.The reason ______he didn't come was ______he was ill.
A. why; that B.that;why C. for that;that D.for which;what
32.He is working hard, ______will make him pass the final exam.
A.that B.which C.for which D.who
33.That is not the way ______I do it.
A./ B.which C.for which D.with which
34.I have two grammars, ______are of great use.
A. all of which B. either of which C. both of that D. both of which
35.I want to use the same tools _______used in your factory a few days ago.
A. as was B. which was C. as were D. which
36.My neigh bours used to give me a hand in time of trouble, _______ was very kind of them.
A. who B. which C. that D. it
37.This is the magazine _______ I copied the paragraph.
A. that B. which C. from that D. from which
38.He is not such a man _______ would leave his work half done.
A. that B. which C. who D. as
39. You can depend on whatever promise _______ he makes.
A. / B. why C. when D. whose
40. Smoking, _______ is a bad habit, is, however, popular.
A. that B. which C. it D. though
41. --- Did you ask the guard _______ happened?
--- Yes, he told me all _______ he knew.
A. what; that B. what; what C. which; which D. that; that
42. I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
A. when; who B. that; which C. which; that D. when; which
43. The number of the people who _______ cars _______ increasing.
A. owns; are B. owns; is C. own; is D. own; are
44. During the days ________, he worked as a servant at the Browns.
A. followed B. following C. to follow D. that followed
45. Is oxygen the only gas _______ helps fire burn?
A. that B. / C. which D. it
46. The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.
A. which; what B. through which; what C. through that; what D. what; that
47. Is _______ some German friends visited last week?
A. this school B. this the school C. this school one D. this school where
48. John got beaten in the game, _______ had been expected.
A. as B. that C. what D. who
49. I have bought two ballpens, _______ writes well.
A. none of them B. neither of them C. neither of which D. none of which
50. All that can be eaten _______ eaten up.
A. are being B. has been C. had been D. have been
参考答案及解析
1. A. which用作关系代词，在定语从句中作主语。
2．C. "和谁讲话”要说speak to sb. 本题全句应为Do you know the man whom I spoke to.。whom是关系代词，作介词to的宾语，可以省略。
3. D. where是关系副词，表示地点，在定语从句中作地点状语。
4. C. when是关系副词，表示时间，在定语从句中作时间状语。
5．A. which是关系代词，在从句中作forget的宾语。其他几个答案都不能作宾语。
6．C. 解析同第5题。
7. A. 解析见第3题。
8. A. 本句话的先行词应该是films,因此，关系代词that是负数概念，其谓语动词应用复述的被动语态have been shown。如果句中的one前面使用了定冠词the，则the one应该视为先行词。
9. A. “谈到某事物”应说talk about sth.。about是介词，其后要用which作宾语，不能用that。
10. A. with which是"介词+关系代词"结构,常用来引导定语从句.with有"用"的意思,介词之后只能用which,不能用that. with which在定语从句中作状语,即he is writing with a pen.
11. C. in front of which 即in front of a farmhouse. In front of which在从句中作状语.
12. D. with whom引导定语从句.with whom放在从句中即为:my father works with the engineer.
13. D. whose引导定语从句,在从句中作主语family的定语.
14. A. that引导定语从句,因为先行词是all,所以只能选用that引导.
15. D. the same……..as是固定用法, as引导定语从句时,可以作主语,宾语或表语.在本句话中,as作从句的主语.
16. D. such……… as是固定用法,as引导定语从句时,可以作主语,宾语或表语.在本题中,as作表语.
17. B. as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词，而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后，也可置于主句前。在本句中,as作宾语.
18. B. Li Ming enjoyed it very much是主句,with whom I went to the concert是定语从句.with whom放在从句中为:I went to the concert with Li Ming.
19. C. as引导定语从句时通常构成such…as或the same…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。 as在从句中可以作主语、表语或宾语。Such修饰单数名词时,要用such a……..,本题中such books, such直接修饰复数名词.
20. B. things和persons是先行词.当定语从句要修饰的先行词是既表示人,又表示物的名词时,其关系代词要用that.
21. D. who引导非限制性定语从句,who作从句的主语.
22. C. two thirds of whom 即:two thirds of the 2,000 workers.
23. D. 先行词person后有两个定语从句,第一个从句省略了关系代词whom.因为, whom作从句中met的宾语,可以省略.第二个从句who could do it.who在从句中作主语,不可省略.
24. A. whose title引导非限制性定语从句,whose title也可以说成the title of which
25. A. for which 引导定语从句,使用介词for,是来自于从句中的固定短语 be famous for "以……..而闻名".
26. C. 当先行词被such修饰时,引导定语从句的关系代词要用as. As在本从句中作主语.
27. A. 两个先行词the day都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when. 第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.
28. D. 在way、distance、direction等词后的定语从句中，常用that来代替“in (或其他介词)+which”、when或where，而that常可省略。
29. D. for which在定语从句中作原因状语,可用why 来替代.
30. B. which I have looked after 构成一个非限制性定语从句.
31. A. The reason why… was that….已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有 “因为”的含义。
32. B. 非限制性定语从句常用which引导,which表示前句话的整个含义.
33. A. 解释见28题.
34. D. 主句中的two表明不能选A.从句中的are表明不能选B. both of which用来引导非限制性定语从句.
35. C. as引导定语从句时通常构成such…as或the same…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。本题中as作从句的主语.
36. B. 非限制性定语从句常用which引导,which表示前句话的整个含义.
37. D.
38. D. 解析见35题.
39. A. he makes是定语从句, 从句前省略了关系代词that.
40. B. which is a bad habit 非限制性定语从句.
41. A. what happened是宾语从句. all 之后that he knew是定语从句.先行词是all,所以关系代词只能用that.
42. D. years是表示时间的名词,用when引导定语从句,是因为when在从句中作时间状语.第二个空选用which,引导一个非限制性定语从句.
43. C. 本句话的定语从句是who own cars. 其先行词是people,因此,定语从句的谓语动词要用复数的own。本句话主句的主语是The number of指“…..的数目”，是单数概念。因此，主句的谓语动词要用is。
44. D. that followed是定语从句，关系代词that在从句中作主语。
45. A. 先行词gas被only修饰，关系代词要用that，而不用which。
46. B. through which引导定语从句，through which即through the hole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。
47. B. 为便于理解，改写本句话：This is the school that some Germanfriends visited last week. 不难看出，作表语的the school是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。
48. A. 解释见35题。
49. C. 因为是two ballpens, 并且定语从句的谓语writes是单数概念。因此，C是正确选项。
50. B. 本句话中，主句的主语是all,为抽象概念。因此，其谓语应用单数的has been。关系代词that引导定语从句，并在从句中作主语。
一）定义及相关术语
1．定语从句：修饰某一名词或代词的从句叫定语从句。定语从句一般紧跟在它所修饰的先行词之后。
2．先行词：被定语从句修饰的词叫先行词。
3．关系词：引导定语从句的词叫关系词。
关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等；关系副词有when, where, why等。
关系词通常有下列三个作用：A、引导定语从句；B、代替先行词；C、在定语从句中担当一个成分。例如：
The man who is shaking hands with my father is a policeman. 该句中，who is shaking hands with my father 是定语从句，修饰先行词the man， “who”是引导定语从句的关系词，代替先行词the man，在定语从句中作主语。
（二）关系代词引导的定语从句
1．who 指人，在定语从句中作主语。
The boys who are playing football are from Class One. 正在踢足球的男孩是一班的。
Those who want to go to the museum must be at the school gate at 7 tomorrow morning. 想去博物馆的人必须在明晨7点到大门口集合。
Yesterday I helped an old man who had lost his way. 昨天我帮助了一位迷路的老人。
That is the teacher who teaches us physics. 那就是教我们物理的老师。
2．whom 指人，在定语从句中做宾语，常可省略。
Mr Liu is the person ( whom ) you talked about on the bus. 刘先生就是你们在公共汽车上谈论的那个人。
Li Ming is just the boy ( whom ) I want to see. 李明正是我想要见的男孩。
The professor ( whom ) you are waiting for has come. 你正在等的教授已经来了。
The girl ( whom ) the teacher often praises is our monitor. 老师经常表扬的那个女孩是我们的班长。
注意：关系代词whom 在口语或非正式文体中常可用who 来代替，也可省略。
The man ( whom / who )you met just now is my old friend.
3．Which 指物，在定语从句中做主语或宾语，做宾语时常可省略。
Football is a game which is liked by most boys. 足球是大多数男孩所喜欢的运动。
The factory which makes computers is far away from here. 制造计算机的那家公司离这儿很远。
He likes to read books which are written by foreign writers. 他喜欢外国作家写的书。
The house which is by the lake looks nice. 湖边的那幢房子看上去很漂亮。
This is the pen ( which ) he bought yesterday. 这是他昨天买的钢笔。
The film ( which ) they went to see last night was not interesting at all. 他们昨晚看的电影一点意思也没有。
4．That 指人时，相当于who 或whom；指物时，相当于which.。在定语从句中作主语或宾语，作宾语时常可省略。
The number of people that / who come to visit this city each year reaches one million. 每年来参观这座城市的人数达一百万。
Where is the man that / whom I saw this morning? 我今天早上看到的那个人在哪儿？
The person that /whom you introduced to me is very kind. 你介绍给我的那个人很友好。
The season that / which comes after spring is summer. 春天以后的季节是夏季。
Yesterday I received a letter that / which came from Australia. 昨天我收到了一封来自澳大利亚的信。
5．Whose 通常指人，也可指物，在定语从句中做定语。
I visited a scientist whose name is known all over the country. 我拜访了一个全国知名的科学家。
He has a friend whose father is a doctor. 他有一个爸爸当医生的朋友。
I once lived in the house whose roof has fallen in. 我曾经住在那幢屋顶已经倒塌了的房子里。
注意：指物时，常用下列结构来代替：
The classroom whose door is broken will soon be repaired.
The classroom the door of which is broken will soon be repaired.
Do you like the book whose cover is yellow?
Do you like the book the cover of which is yellow?
（三）“介词+关系代词”引导的定语从句
关系代词在定语从句中作介词宾语时，从句常常由“介词+关系代词”引出。
The school (which / that) he once studied in is very famous.
The school in which he once studied is very famous. 他曾经就读过的学校很出名。
Tomorrow I’ll bring here the magazine (which / that) you asked for.
Tomorrow I’ll bring here the magazine for which you asked.明天我将把你要的杂志带来。
This is the boy (whom / who / that) I played tennis with yesterday.
This is the boy with whom I played tennis yesterday. 这是我昨天跟他打台球的男孩。
We’ll go to hear the famous singer (whom / who / that) we have often talked about.
We’ll go to hear the famous singer about whom we have often talked.我们将去听那位我们经常谈论的著名歌唱家演唱。
The manager whose company I work in pays much attention to improving our working conditions.
The manager in whose company I work pays much attention to improving our working conditions.
我工作的那家公司的经理十分注意改善我们的工作条件。
注意：１．含有介词的短语动词一般不拆开，介词仍放在短语动词的后面。如：look for, look after, take care of 等。
This is the watch (which / that) I am looking for. (正) 这是我正在找的手表。
This is the watch for which I am looking . (误)
The babies (whom / who / that) the nurse is looking after are very healthy. (正) 那个保姆照看的小宝宝们都很健康。
The babies after whom the nurse is looking are very healthy. （误）
２．若介词放在关系代词前，关系代词指人时只可用whom，不可用who, that；关系代词指物时只可用which，不可用that。关系代词是所有格时用whose。
The man with whom you talked just now is my neighbour. (正) 你刚才跟他谈话的那个人是我的邻居。
The man with that / who you talked just now is my neighbour. (误)
The plane in which we flew to Canada was really comfortable. (正)我们去加拿大所乘坐的飞机实在很舒服。
The plane in that we flew to Canada was really comfortable. (误)
３．“介词+关系代词”前还可有some, any, none, all, both, neither, many, most, each, few等代词或者数词。如：
He loves his parents deeply, both of whom are very kind to him. 他深深地爱着他的父母，他们俩待他都很好。
In the basket there are quite many apples, some of which have gone bad. 篮子里有好些苹果，有些已经坏了。
There are forty students in our class in all, most of whom are from big cities. 我们班总共有４０个学生，大多数来自大城市。
Up to now, he has written ten stories, three of which are about country life. 迄今为止，他写了１０部小说，其中３部是关于农村生活的。
（四）关系副词引导的定语从句
1． when 指时间，在定语从句中作时间状语。
I still remember the day when I first came to this school. 我仍然记得我第一次来到这所学校的那一天。
The time when we got together finally arrived. 我们团聚的时刻终于到了。
October 1, 1949 was the day when the People’s Republic of China was founded. 1949年10月1日是中华人民共和国成立的日子。
Do you remember the years when he lived in the countryside with his grandparents. 你还记得在农村和你祖父母一起生活的那些年吗？
2． where 指地点，在定语从句中作地点状语。
Shanghai is the city where I was born. 上海是我出生的城市。
The house where I lived ten years ago has been pulled down. 我十年前住的房子已经被拆掉了。
I visited the farm where a lot of cows were raised . 我参观了那个饲养了许多奶牛的农场。
Is this the place where they fought the enemy? 这是他们当初打敌人的地方吗？
3． why 指原因，在定语从句中作原因状语。
Please tell me the reason why you missed the plane. 请告诉我你误机的原因。
The reason why he was punished is unknown to us. 他受惩罚的原因我们都不知道。
I don’t know the reason why he looks unhappy today. 我不知道他今天为什么看上去不愉快。
注意：关系副词引导的定语从句经常可以用“介词+关系代词”引导的定语从句来表示。如：
From the years when / in which he was going to primary school in the country he had known what he wanted to be when he grew up. 自从他在农村读小学时，他就已经知道长大后要做什么。
Great changes are taking place in the city where / in which they live. 他们生活的城市正发生巨大的变化。
The reason why / for which he refused the invitation is quite clear. 他为什么拒绝接受邀请的原因是十分明了的。
（五）限制性定语从句和非限制性定语从句
| 限制性定语从句 | 非限制性定语从句 |
形式上 | 不用逗号“，”与主句隔开。 | 用逗号“，”与主句隔开。 |
意义上 | 是先行词不可缺少的定语，如删除，主句则失去意义或意思表达不完整。 | 只是对先行词的补充说明，如删除，主句仍能表达完整的意思。 |
译法上 | 译成先行词的定语：“．．．的” | 通常译成主句的并列句。 |
关系词的使用上 | A．作宾语时可省略 | A．不可省略 |
B．可用that | B．不用that |
C．可用who 代替whom | C．不可用who 代替whom |
限制性定语从句举例：
The teacher told me that Tom was the only person that I could depend on. 老师告诉我说汤姆是我唯一的可以依靠的人。
China is a country which has a long history. 中国是一个历史悠久的国家。
In the street I saw a man who was from Africa. 在街上我看到一个来自非洲的人。
非限制性定语从句举例 ：
His mother, who loves him very much, is strict with him. 他妈妈十分地爱他，对他要求很严格。
China, which was founded in 1949, is becoming more and more powerful. 中国是1949年成立的，现在正变得越来越强大。
Last summer I visited the People’s Great Hall, in which many important meetings are held every year. 去年夏天，我参观了人民大会堂，在那儿每年都要举行许多重要会议。
注意区分下列几组句子的不同含义：
1. Her brother who is now a soldier always encourages her to go to college.
她那当兵的哥哥总是鼓励她上大学。（意含： 她还有其他哥哥。）
Her brother, who is now a soldier, always encourages her to go to college.
她哥哥是当兵的，他总是鼓励她上大学。（意含：她只有一个哥哥。）
2. All the books that have pictures in them are well written.
所有里面带插图的书都写得很好。（意含：不带插图的书则不一定写得好。）
All the books, which have pictures in them, are well written.
所有的书都带插图，这些书都写得很好。（意含：没有不带插图的书。）
（一）限制性定语从句中只能用that 引导定语从句的情况
1．当先行词是everything, anything, nothing (something 除外), all, none, few, little, some等代词时，或当先行词受every, any, all, some, no, little, few, much等代词修饰时。如：
Have you taken down everything that Mr. Li said? 李老师讲的你都记下来了吗？
There seems to be nothing that is impossible to him in the world. 对他来说似乎世界上没有什么不可能的事。
All that can be done has been done. 所有能做的都做好了。
There is little that I can do for you. 我不能为你干什么。
He stayed in the library and looked up any information that they needed. 他呆在图书馆查找所需的资料。
注意：当先行词指人时，偶尔也可用关系代词who，如：
Any man that / who has a sense of duty won’t do such a thing. 任何有责任感的人都不会做这样的事。
All the guests that / who were invited to her wedding were important people. 所有应邀来参加她婚礼的客人都是重要人物。
2．当先行词被序数词修饰时。如：
The first place that they visited in London was the Big Ben. 在伦敦他们参观的第一个地方是大本钟。
3．当先行词被形容词最高级修饰时。如：
This is the best film that I have ever seen. 这是我看过的最好的电影。
4．当先行词被the very, the only修饰时。如：
This is the very dictionary that I want to buy. 这正是我要买的词典。
After the fire in his house, the old car is the only thing that he owns. 家里发生了火灾过后，那辆旧车成了他的唯一拥有。
注意：当先行词指人时，偶尔也可用关系代词who。如：
Wang Hua is the only person in our school who will attend the meeting. 王华是我校唯一出席会议的人。
5．当先行词前面有who, which等疑问代词时。如：
Who is the man that is standing by the gate? 站在门口的那个人是谁？
Which is the T-shirt that fits me most? 哪件T恤衫最合我的身？
6．当先行词为人与动物或人与物时。如：
They talked about the persons and things that they remembered at school 他们谈论着他们所能记起的在校时的人和事。
Look at the man and his donkey that are walking up the street. 瞧瞧那个沿街走来的人和他的 毛驴。
（二）关系代词as和which 引导的定语从句
as 和which 引导非限制性定语从句时，其用法有相同之处，也有不同之处。具体情况是：
1. as 和which都可以在定语从句中做主语或宾语，代表前面整个句子。如：
He married her, as / which was natural. 他跟她结婚了，这是很自然的事。
He is honest, as / which we can see. 他很诚实，这一点我们看得出来。
2. as 引导的非限制性定语从句可以放在主句之前、主句之后，甚至还可以分割主句。 which 引导的非限制性定语从句只可放在主句之后。另外，as 常常有“正如、正像”的含义。如：
As is known to all, China is a developing country. 众所周知，中国是发展中国家。
He is from the south, as we can know from his accent. 他是南方人，这一点我们从他的口音可以知道。
John, as you know, is a famous writer. 正如你所知， 约翰是个著名作家。
Zhang Hua has been to Paris more than ten times, which I don’t believe. 张华已去过巴黎十多次了，这一点我不相信。
注意：当主句和从句之间存在着逻辑上的因果关系时，关系词往往只用which。如：
Tom was late for school again and again, which made his teacher very angry. 汤姆老是迟到，这使得老师很恼火。
These tables are made of metal, which made them very heavy. 这些桌子是金属的，这使得这些桌子很重。
3.当先行词受such, the same 修饰时，关系词常用as。 如：
I’ve never heard such stories as he tells. 我从未听过象他讲的这样的故事。
He is not such a fool as he looks. 他可不象他看上去的那样傻。
This is the same dictionary as I lost last week. 这部词典跟我上星期丢失的一样。
注意：当先行词受the same 修饰时，偶尔也用 that引导定语从句，但与as引导的定语从句意思有区别。如：
She wore the same dress that she wore at Mary’s wedding. 她穿着她在玛丽婚礼上穿过的同一条连衣裙。
She wore the same dress as her younger sister wore. 她穿着跟她妹妹所穿的一样的连衣裙。
(三) 以the way为先行词的限制性定语从句通常由in which或that引导，而且通常可以省略。如：
The way (that / in which ) he answered the questions was surprising. 他回答这些问题的方式令人惊奇。
I don’t like the way (that / in which) you laugh at her. 我不喜欢你冲她的样子。
（四）关系代词与关系副词的选择
用关系代词还是关系副词引导定语从句主要看关系词在定语从句中的作用（即所担当的成分）。试比较：
A. I know a place where we can have a picnic. 我知道一个我们可以野炊的地方。
I know a place which / that is famous for its beautiful natural scenery. 我知道一个以自然景色优美而闻名的地方。
B. I will never forget the days when we spent our holidays together. 我永远忘不了我们一起度假的日子。
I will never forget the days that / which we spent together. 我永远忘不了我们一起度过的日子。
C. This is the reason why he was dismissed. 这就是他被解雇的原因。
This is the reason that / which he explained to me for his not attending the meeting. 这就是他向我解释的他没有参加会议的原因。
（五）but 有时也用作关系词引导定语从句。如：
There are very few but admire his talents. 很少有人不赞赏他的才干的。（but = who don’t）
（六）定语从句与同位语从句的区别
1．定语从句修饰限定先行词，它与先行词是修饰关系；同位语从句说明先行词的具体内容，它与先行词是同位关系。
The plane that has just taken off is for Paris. （定语从句） 刚刚起飞的那架飞机是开往巴黎的。
The fact that he has already died is quite clear. （同位语从句） 他已经去世了，这个事实很明了。
2．定语从句由关系代词或关系副词引导，关系词在从句中担当相应的句子成分，关系代词在从句中作宾语时经常可省略。同位语从句主要由连词that 引导，在从句中一般不担当成分；有时也由where, when, how, who, whether, what 等连词引导，这些连词则在从句中担当成分。
The news that he told me is true. （定语从句） 他告诉我的消息是真的。
The news that he has just died is true. （同位语从句）他刚刚去世了，这个消息是真的。
The problem that we are facing now is how we can collect so much money. (定语从句) 我们现在面临的问题是如何筹集这么多资金。
The problem how we can collect so much money is difficult to solve. （同位语从句） 我们如何筹集这么多资金，这个问题很难解决。
The question that he raised puzzled all of us. （定语从句） 他提出的问题让我们很为难。
The question whether he is sure to win the game is hard to answer. （同位语从句） 他是否一定会赢得那场比赛，这个问题很难回答。
3．同位语从句与先行词一般可以用动词be发展成一个完整的句子, 而定语从句则不能。如：
A. The idea that he we could ask the teacher for advice is wonderful. （同位语从句） 我们可以向老师请教，这个主意不错。
The idea was that we could ask the teacher for advice.
B. The fact that the earth moves around the sun is known to all. （同位语从句） 地球围绕太阳转，这个事实人人皆知。
The fact is that the earth moves around the sun.
C. Pay attention to the problem how we can protect the wild animals. （同位语从句） 请注意如何保护野生动物这个问题。
The problem is how we can protect the wild animals.
