1. 定语从句 2. 先行词
3. 关系词的用法：关系代词&关系副词
一、定语从句：充当定语功能的句子
定语可以由形容词、名词、代词、数词、分词、副词、不定式以及介词短语等来充当，也可以由一个句子来充当。定语从句用来修饰名词、代词或整个主句。 Tom is a hardworking student who always gets first in his class. 汤姆是一个用功的学生，他在班里总是第一名。（修饰名词student。）
Football is played over 80 countries, which makes it popular. 80多个国家都在踢足球，因此足球很流行。 （修饰整个主句Football is played over 80 countries。） 二、先行词与关系词
1. 先行词：被定语从句修饰的名词、代词
Don’t forget the book that I told you to bring. 别忘了我让你带的书。（the book为先行词。）
2. 关系词：引导定语从句的关联词，分为关系代词与关系副词。关系代词在定语从句中作主语、宾语、表语、定语等；关系副词在定语从句中作状语。 关系代词有：that, which, who, whom, whose… 关系副词有：where, when, why…
I will never forget the days when I stayed in New York. 注意：
① 关系词一般紧跟在先行词之后引导定语从句。定语从句总在被修饰的先行词后面。 ② 关系代词起着代词和连词的作用，关系副词起着副词和连词的作用。 ③ 关系词代替先行词，因此在定语从句中不能再重复使用相当于先行词的词。 下面的句子是错误的：
This is the right book that you are looking for the book.（应去掉the book。） This is the right book that you are looking for it.（应去掉it。） ① 常见的关系代词 指代对象 主格 宾格 所有格 ②常见的关系副词 指代对象 时间 地点 原因
Our chemistry teacher is a man who/that can make his class lovely and interesting.
我们的化学老师可以使他的课堂生动有趣。 （who/ that在定语从句中作主语，代指人a man。） The books that/ which they bought were written by me. 他们买的那些书是我写的。 （that/which 在定语从句中作宾语，代指物 the books。）
Make marks in places where you have questions. 在你有问题的地方做出标记。 （where为关系副词，在定语从句中作地点状语。）
I still remember the time when we first met scores of years ago.
我依然记得几十年前我们第一次见面的情景。 （when为关系副词，在定语从句中作时间状语。）
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指代人 who, that whom, that whose 先行词 day, year, date, time the place, the city, Beijing the reason 指代物 which, that as 既可指人也可指物 that whose 关系副词及相应介词结构 when, during which where, in which, from which why, that, for which 2定语从句 微信：ziqidonglai12378
三、关系代词选择三步骤： 1. 首先找出先行词。
The book that/which you just laid on the top shelf is mine.
你刚才放在高层书架上的书是我的。（the book是先行词，指物。） 2. 确定先行词在从句中所作的成分。
先行词the book在后面的定语从句中作laid的宾语，因此选择指物的关系代词which/that作宾语。 3. 确定关系代词的人称和数。
先行词the book可知是第三人称单数，如果关系代词作主语，则从句的谓语动词相应用单数。
关系代词的用法：
常用关系代词有who, whom, whose, that, which… ，在定语从句中作主语、宾语、表语、定语等。 关系代词主要起三种作用：代替先行词、在定语从句中作成分、连接先行词与定语从句。 This is an old computer. It works much slower. 这是一台旧电脑。它工作起来速度较慢。 （普通代词it代替an old computer。）
This is an old computer which/that works much slower. 这是一台工作起来速度较慢的旧电脑。 （关系代词which/ that代替an old computer。）
(1) who/whom的用法
二者都用于指人。who在定语从句中作主语、宾语，whom在定语从句只作宾语。 In this earthquake, the number of people who lost homes reached as many as 250,000. 在这次地震中失去家园的人数多达250000。（who在定语从句中作主语。）
The man whom you met just now is my friend. 你刚才见到的那个人是我的朋友。 （whom在定语从句作宾语。）
(2) whose的用法：whose一般指人，但有时也指物。在定语从句中作定语。
You’re the only one whose advice he might listen to. 只有你的建议他可能会听。 （whose在定语从句中作advice的定语。）
I’d like a room whose window looks out over the sea. 我想要一个通过窗户可以俯看大海的房间。 （whose在从句中作window的定语。）
(3) which的用法：which一般指物，在定语从句中作主语、宾语。
Football is a game which is liked by most boys. 足球是大多数男孩子喜欢的一项运动。 （which在定语从句中作主语）
This is the pen which he bought yesterday. 这是他昨天买的那支钢笔。 （which在定语从句中作宾语，可以省略）
(4) that的用法：that指人或物，在从句中可作主语，宾语或表语。作宾语或表语时可省略。
指人时相当于who或whom,指物时相当于which.
The number of the people that/who come to visit the city each year is rising. 每年来参观这个城市的人的数量在增多。（that在定语从句中当主语）
Where is the man that/whom I saw this morning? 我今天上午见到的那个人在哪儿？ （that在定语从句作宾语）
四、关系副词的用法：常用的有where, when, why, that等。这些关系副词在定语从句中作状语。 (1) where的用法：在定语从句中作地点状语，指代地点。
此时常可用in which, on which, at which, to which等结构代替。 Potato can be grown in places where it is too cold to grow rice.
（＝Potato can be grown in places in which it is too cold to grow rice.） 有些太冷不能种稻米的地方，可以种马铃薯。
(2) when的用法：在定语从句中作时间状语，往往代指时间。此时常可用on which, in which, at which,
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during which等代替。
I shall never forget the days when we worked on the farm.
（＝I shall never forget the days on which we worked on the farm.） 我永远也不会忘记我们在农场劳动的那些日子。
(3) why的用法：why在定语从句中作原因状语。可以用for which代替。why不可引导非限制性定语从
句，此时可用for which代替。
I have come around to explain the reason why I was absent from the meeting. 我来是为了向你解释我当时没到会的原因。（why在从句作原因状语。） (3) that的用法：在表明方式、时间或地点的先行词后面，常用that来代替in which，when或where， that
也可省去。that在句中不作任何成分，只起到引导定语从句的作用，修饰的先行词常为the way, the time, the day, the place等，此时也可换为其他相应的关系副词。
1) 表示方式时：
that（=in which）常省略，此时不能用how引导定语从句。但把the way去掉之后，可直接用how引导方式状语。
Can you work out a way （that/ in which） we can solve this problem？
你能找出一种我们可以解决这个问题的方法吗？（that在定语从句中不作成分。） 2) 表示地点时：
that（＝where＝介词＋which）也可省略。
I have never been to the places（that/ where/ in which） the Indians live. 我从未到过那些印第安人居住的地方。（that在定语从句中不作成分。） 3）表示时间时：
that（=when=介词＋which）也可省略。
I still remember the days （that/ when/on which） I helped my father on the farm. 我仍然记得在农场上给我爸爸帮忙的日子。（that在定语从句不作成分。） 4) 另外，关系副词that有时还可用来代替关系副词why，表示原因。
The reason that（=why）he lost his life was lack of medical care. 他的死是由于缺乏医疗护理。 注意：在下面这个句子中，不能用why，只能用which或that。
I don’t want to hear any reason （that/ which）you might give. 我不想听你给出的任何理由。 （在这个定语从句中，that/ which作定语从句中谓语动词give的宾语。）
五、定语从句中需要注意的问题
1. what，how不可引导定语从句 ① what本身是复合关系代词，等同于“先行词＋关系代词（which/that）”。不能用what引导定语从句。 Time is what we demand most. （=Time is all (that) we demand most.）我们所需要的就是时间。 Tell me what is happening. （=Tell me something that is happening.）告诉我正在发生什么事。 She isn’t what she used to be. （=She isn’t the one (that) she used to be.）她不是过去的她了。 ② how为复合关系副词。本身等同于the way，in which，因此，不能用how引导定语从句。
I don’t like how you behave. (=I don’t like the way (that/ in which) you behave.) 我不喜欢你行事的方法。 This is how I worked out this problem. （=This is the way (that/ in which) I worked out this problem.） 这就是我解出这道题的方法。
2．关系代词that和which的用法辨析
that和which在定语从句中都可作主语或宾语，指物。作宾语时，均可省略。通常情况下，二者可互换使用。但有时却不宜随便互换。 ① 宜用that的情况
1) 当先行词是all, much, little, few, something, anything, everything, none, nothing, some等不定代词或被
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不定代词修饰时。
Have you taken down everything that Mr Li has said ?（李老师所说的话你都记下来了吗？） There is little that I can do for you. （我几乎不能为你做任何事。） 2) 先行词被序数词修饰时，只能用that
The first place that they visited in London was the Big Ben. （他们在伦敦参观的第一站就是大笨钟。） 3) 先行词被形容词最高级修饰时，只能用that
This is the best film that I have seen. （这是我看过的最好的电影。） 4) 当先行词有the only, the same, the very, 等词修饰时。
These articles are the very ones that should be read.(这些文章才是应该读的。) Chatting was the only thing that interested her most. (聊天是她唯一感兴趣的事。) 5) 当主句是以who或which开头的特殊疑问句时
Who is the person that is standing at the gate？(站在门口的那个人是谁？) 6) 当先行词有两个或两个以上，并且分别表示人和物时
She took photographs of the things and people that she was interested in. (她把她所感兴趣的人和物全拍摄了下来。) 7) 当主句以here, there开头时
Here is a hotel that you’ve been looking for.(这就是你一直在找的旅馆。) There is a seat in the corner that is still not taken.(在角上还有一个空位。)
※ 当定语从句中先行词前是such, so, as, the same等时，用关系代词as来引导，as在定语从句中作主语或宾语。
注意：在表示“如此…以致…”的such /so…that…结构中，that不作任何句子成份。
非限定性定语从句起补充说明作用，在句子中不充当成分，缺少也不会影响全句的理解，它与主句往往用逗号隔开。将非限定性定语从句放在句子中间，其前后都需要用逗号隔开。
限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确。
引导状语从句的连词as可以用作关系代词，引导定语从句，因而被称作准关系代词。
1. 准关系代词as引导限制性定语从句，用于以下3个结构中，as在从句中作主语、宾语或表语： a. so / such…as
Such people as were mentioned by him were honest. (as作主语) I’ve never seen such a clever man as he is. (as作表语)
Last term our maths teacher set so difficult an (= such a difficult) examination problem as none of us
worked out. (as作宾语) b. the same…as
Modern statemen are often faced with the same problem as defeated the ancient Romans. (as 作宾语) I like the same book as you do. (as 作宾语) c. as…as
As many children as came were given some cakes. (as 作主语)
（as...as引导定语从句时，第一个as还是程度副词,意思就是“同样,相同”。第二个as为定语从句的关系代词，类似于which/that/who等，代指其前面的名词/代词，并在定语从句中充当主语、宾语、表语等）
第二个as代替先行词children，在后面的定语从句中充当主语。 1. He is as diligent a man as ever lived. (as 作主语)
同样，第二个as代指前面的先行词a man,做ever lived的主语. 2. I give him as much as he could eat.
也通常理解为定语从句，much为代词，相当于much food. 第二个as代替much (food)，在定语从句中充当eat的宾语.
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3. We've got food for as many people as want it. 翻译：我们弄到了无论多少人吃都够了的食物.
第一个as还是“一样地”,第二个as代指people,做want it的主语. 4. She will marry as healthy a man as she can find.
还是引导定语从句，第一个as依旧是程度副词“一样地”（用法上类似于so）,修饰形容词healthy,表示程度. 补充：
a. such…as 与 such…that的区别
such…as 引导定语从句；such…that引导结果状语从句。
They talked in such simple English as children could understand. 他们用孩子们能听懂的简单的英语交谈。
They talked in such simple English that children could understand it. 他们用十分简单的英语交谈，连孩子们都能听懂。 I will provide you with such things as you may need. 我要供给你一些你可以用得着的东西。
He shut the window with such a force that the glass broke. 他如此用力地关门，结果玻璃碎了。 b. the same…as与the same…that的区别：
the same…as指两物相似，the same..描述的是同一物。 This is the same bag as I lost yesterday. 这个书包和我昨天丢失的（书包）相似。（相似物） This is the same bag that I lost yesterday. 这正是我昨天丢失的那个书包。（同一物） 2. 准关系代词as引导非限制定语从句。
a. as引导非限制性定语从句，只代表主语或主句的一部分所表达的意思(不能指代某个名词或代词)，可以放在主句前， 后或中间，在从句中作主语或宾语、例如：
As is known to all, he is the best student in our class. (as指代整个句子，作主语，置于句首) He opposed the idea, as could be expected. (as 指代整个句子，作主语，置于句末) As we all know, he studies very hard. (as 指代整个句子，作宾语，置于句首)
Taiwan is, as you know, an inseparable part of China. (as指代整个句子，作宾语，置于句中) 常用的这类句式有：
as is said above 综上所述 as is known to all 众所周知 as is often the case 通常如此
as is reported in the newspaper 如报纸所报导的
b. 主句具有否定意义，as引导的定语从句位于主句之后时，as指代的主句不包括否定意义，并可用but取代。例如： Whales are no fish, as some people think / but some people think they are. I am no orator, as Brutus is.我不善言词,而勃鲁特斯却是个雄辩家.
Spiders are not insects, as many people think, nor even nearly related to them. 蜘蛛不是昆虫,尽管许多人认为它是昆虫,它甚至与昆虫几乎没有关系. 但当as引导的定语从句位于主句前时，as指代的主句仍包括否定意义。 As has been said above, grammar is not a set of dead rules. 正如前面所说的，语法不是一套死条文。
3. 在非限制性定语从句中，which和as引导定语从句时的区别：
a. which引导的从句不能放在主句前，而as引导的从句则既可以放在主句前，也可以放在主句后。 b.能 用作关系代词，as和which都可以指代一个句子，但as有“正如”、“就像”之意，which则没有此含义。 He is a foreigner, as I know from his accent. (as指代一个句子，意为“正如”、“就像”)
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He has to work on Sunday, which he doesn’t like. (which指代一个句子，没有“正如”、“就像”)
c. 当从句的谓语动词是be或相当于连系动词的seem, become等时，可用as或which作主语。但当从句的谓语是行为 动词时，只能用which作主语。
4. as 可用作连词，引导状语从句，构成省略形式“as + 过去分词”这一特殊结构，译成汉语时作用如定语。例如： The bridge as shown in the picture is really wonderful. (as shown = as it is shown 可译为“图中的桥”) See the answers as given at the end of this book. (as given = as it is shown 可译为“书后给出的答案”) English as spoken in Australia is slightly different from British English. (as spoken = as it is spoken 可译为“在澳大利亚讲的英语”) 请看下列的“as + 过去分词”结构用于修饰前面的名词：
The study as described in the article… 如文章中描述的那种学习 The program as conducted by… 由…指挥的（指导的）节目 The art as applied to medicine… 应用于医学的艺术 The products as seen on TV…电视上看到得产品
六、典型分析
1．Mr. Smith ________ is smoking is looking for ________ he lost yesterday.
A．whom；which B．who；what C．that；who D．which；where 2．One of the most delicious drinks ________ I like is orange juice.
A．which B．that C．whose D．whom
3．We all like the story about the teacher ________ happened in our school last week.
A. which B．who C．whom D．what 4. I know a place _____we can have a big meal.
A. that B. where C. which D. what 5. The designers______ helped us build the library are from the UK.
A. which B. whom C. who D. whose 6. There are lots of things_______ I need to prepare before the trip.
A. who B. that C. whom D. whose 7. People often like clothes_______ can make them look young.
A. what B. that C. who D. in which 8. The little boy was wrapping the present _______would be sent to his teacher.
A. who B. that C. what D. / 9. ---There are so many girls over there. Which one is your sister? ----The one_____ hat is yellow.
A. who B. whose C. that D. which 10. I shall never forget the day_______ I spent with you.
A. when B. that C. in which D. where 七、专题练习
1. Nearly all the streets are in straight lines, ________ from east to west. Those ________ run from north to south are called avenues.
A. running; that B. run; who C. running; who D. run; that 2. This is the case ________ he’s had all his money stolen.
A. when B. where C. that D. on which
3. Mr. Smith will pay a visit to Beijing this autumn, ________ we will enjoy the Olympic Games in 2008.
A. where B. when C. which D. how
4. The artist will not paint people or animals but he will paint anything ________ .
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A. that the little girl asks him B. the little girl asks him to C. for the little girl to ask him D. what the little girl asks him 5. —How did you get in touch with the travel agent, Robin?
—Oh, that’s easy. I surfed the Internet and then called one ________ the telephone number is provided. A. which B. in which C. of which D. whose 6. October 15th is my birthday, ________ I will never forget.
A. when B. that C. what D. which
7. The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.
A. when B. where C. which D. whose
8. There are several research centers in China ________ a certain disease called Bird Flu is being studied.
A. which B. where C. when D. what
9. I hope that the little ________ I have been able to do does good to them all.
A. which B. what C. that D. when
10. The time is not far away ___ modern communications will become widespread in China’s vast countryside.
A. as B. when C. until D. before
11. ________ is known to everybody, Taiwan is a part of China. We must unify it.
A. It B. As C. Which D. What
12. I shall never forget the day ________ Shen Zhou V was launched, ________ has a great effect on my life.
A. when, which B. that, which C. which, that D. when, that
13. The bread my wife makes is much better than ________ you can buy at a store.
A. that which B. one that C. that of which D. this of which 14. There is no such place ________ you dream of in all this world.
A. that B. what C. which D. as
15. The people, ________ had been damaged by the flood, were given help by the Red Cross.
A. all whose homes B. all of whose homes C. all their homes D. all of their homes 16. The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.
A. who B. when C. on which D. which
17. Is this research center ________ you visited the modern equipment last year?
A. where B. that C. the one that D. the one where 18. Some pictures of the river brought the days back to the old ________ they swam in it.
A. when B. that C. who D. where 19. The man showed us so heavy a stone ________ no man can lift.
A. that B. as C. which D. and
20. He stayed there for quite a long time, during ________ time he learned much spoken English.
A. that B. this C. which D. same
答案：
六：1-5 BBBAC 6-10 BBBBB
七：1-5 ABABC 6-10 DBBCB 11-15 BAADB 16-20 DDABC
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定语从句练习50题
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.
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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 neighbours 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
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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 ball pens, _______ 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是复数概念，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.
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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 German friends 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 ball pens, 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。
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