（一）定語從句一般由關系代詞和關系副詞引導
1、關系代詞：who, whom, whose, which, that, as
2、關系副詞：when, where, why
關系代詞和關系副詞必須位于從句之首，主句先行詞之后，起著連接先行詞和從句的作用， 同時在從句中又充當句子成分。
e.g. She is the girl who sings best of all.（關系代詞who在從句中作主語）
The comrade with whom I came knows French.（whom在從句中作介詞with的賓語）
3、關系代詞和關系副詞的用法：1）當先行詞為人時用who 作主語，whom作賓語；2）當先行詞為物或整個句子時用which ，可作主語或賓語；3）先行詞為人、物時用that ，可作主語或賓語；4）whose用作定語，可指人或物；5）關系副詞when（指時間，在定語從句中作時間狀語，where（指地點，在定語從句中作地點狀語），why（指原因，在定語從句中作原因狀語）。
（二）限制性定語從句與非限制性定語從句
1、限制性定語從句：從句與主句關系密切，去掉從句，主句意義不完整，甚至不合邏輯。
e.g. I was the only person in our office who was invited.（去掉定語從句，意思就不完整）
2、非限制性定語從句：從句對先行詞關系不密切，去掉定從句，意思仍然完整。形式上用逗號隔開，不能that用引導。
e.g. Tom’s father, who is over sixty, still works hard day and night.（who引導非限制性定語從句，整個句子可分成兩句來翻譯）
（三）使用定語從句時特別注意的幾個問題
1、that與which的區別。
1）用that而不用 which的情況：①先行詞為不定代詞all, anything, nothing, …；②先行詞有最高級修飾，有序數詞修飾；③先行詞有only, very, any等詞修飾；④先行詞既有人又有物時。
e.g. There is nothing that can prevent him from doing it. 沒有什么能阻止他不干那件事。
The first place that they visited in Guilin was Elephant Trunk Hill. 在桂林他們所參觀的第一個地方是象鼻山。
This is the best film that I have ever seen. 這部電影是我看過的最好的一部。
Mr Smith is the only foreigner that he knows. 史密斯先生是他認識的唯一的外國人。
2）用which而不用 that的情況：①引導非限制性定語從句；②代表整個主句的意思；③介詞 + 關系代詞。
e.g. He had failed in the maths exam, which made his father very angry. 他數學考試沒有及格，這使他的父親很生氣。
This is the room in which my father lived last year. 這是父親去年居住過的房子。
3）as引導定語從句時的用法
①as引導限制性定語從句通常用于the same … as, such … as結構中。
e.g. I want the same shirt as my friend’s. 我要一件跟我朋友一樣的襯衫。
Such machines as are used in our workshop are made in China. 我們車間使用的這種機器是中國制造的。
②as引導非限制性定語從句既可放在主句之前，也可放在主句之后，用來修飾整個句子。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. 正如我所預料的那樣，他在這次期中考試中又獲得了第一名。
3）as 引導非限制性定語從句時與which的區別
①當主句和從句語義一致時，用as；反之，用which來引導非限制性定語從句。
e.g. He made a long speech, as we expected.
He made a long speech, which was unexpected.
②當非限制定語從句為否定時，常用which引導。
e.g. Tom drinks a lot every day, which his wife doesn’t like at all.
2. 關系代詞在從句中作主語時，從句的謂語動詞單數還是用復數應由先行詞決定。
e.g. The man who lives downstairs speaks English fluently. 住在樓下的那個人英語說得很流利。
The students who are in Grade Three are going to climb the hill tomorrow.
3. 定語從句有時不直接緊靠先行詞，中間由一個定語、狀語或謂語隔開。
e.g. There is an expression in his eyes that I can’t understand.
4. 引導定語從句的關系副詞有時可以用“介詞 + which”來代替。
e.g. October 1, 1949 was the day on which ( = when ) the People’s Republic of China was founded.
5. 當定語從句中謂語動詞是帶介詞或副詞的固定短語動詞時，短語動詞的各個固定部分不要拆開。
e.g. The sick man whom she is looking after is her father.
6. 介詞在關系代詞前，只能用which和whom，且不能省略；介詞在句尾，關系代詞可有which, that, whom, 口語中也可用who，且可省略。
e.g. The man (whom/ who/ that) you were talking about has come to school.
練習、定語從句
一、把下列每對句子合并成含有定語從句的主從復合句：
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 child. 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 flew a 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、根據句子意思，在第一個空白處填入介詞，在第二個填入關系代詞whom或which:
1. The person ________ ________ I spoke just now is the manager 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, ________ ________ this is one example, are well written.
三、選擇填空：
1. The man ____ visited our school yesterday is from London.
A. who B. which C. whom D. when
2. The woman ____ is talking to my mother is a friend of hers.
A. whose B. who C. whom D. which
3. Because of my poor memory, all ____ you told me has been forgotten.
A. that B. which C. what D. as
4. Do you remember those days ____ we spent along the seashore very happily?
A. when B. where C. which D. who
5. Tom did not take away the camera because it was just the same camera ____ he lost last week.
A. which B. that C. whom D. as
6. Those ____ want to go please sign their names here.
A. whom B. which C. who D. when
7. Where is the man ____ I met this morning?
A. when B. where C. which D. who
8. Who is the woman ____ is sweeping the floor over there?
A. who B. / C. that D. when
9. The man ____ you talked just now is a worker.
A. who B. whom C. to whom D. to who
10. The man ____ you are going to make friends is my father’s neighbour.
A. with whom B. when C. to whom D. which
11. The doctor ____ is leaving for Africa next month.
A. the nurse is talking to him B. whom the nurse is talking
C. the nurse is talking to D. who the nurse is talking
12. The man ____ around our school is from America.
A. which you showed B. you showed him C. you showed D. where you showed
13. He talked about a hero ____ no one had ever heard.
A. of whom B. from whom C. about that D. who
14. In fact the Swede did not understand the three questions ____ were asked in French.
A. where B. who C. in which D. which
15. Have you read the book ____ I lent to you?
A. that B. whom C. when D. whose
16. Finally, the thief handed over everything ____ he had stolen to the police.
A. that B. which C. whatever D. all
17. The foreign guests, ____ were government officials, were warmly welcomed at the airport.
A. most of them B. most of that C. most of whom D. most of those
18. This is the very letter ____came last night.
A. who B. which C. that D. as
19. I know only a little about this matter; you may ask ____ knows better than I.
A. whoever B. whomever C. anyone D. the one
20. This is the school ____ we visited three days ago.
A. where B. / C. when D. what
21. This is the factory ____ we worked a year ago.
A. where B. that C. which D. on which
22. Nearby were two canoes ____ they had come to the island.
A. which B. in which C. that D. /
23. Jack is pleased with ____ you have given him and all ____ you have told him.
A. that, what B. what, that C. which, what D. that, which
24. Do you work near the building ____ colour is yellow?
A. that B. which C. its D. whose
25. In the dark street, there wasn’t a single person ____ she could turn for help.
A. whom B. who C. to whom D. form whom
26. Is this school ____ we visited three years ago?
A. the one B. which C. that D. where
27. Is this the school ____ we visited three years ago?
A. the one B. where C. in which D. /
28, How many students are there in your class ____ homes are in the country?
A. whose B. who C. whom D. which
29. Alice received an invitation from her boss, ____ came as a surprise.
A. it B. which C. that D. he
30. The train was crowded and I had to get into a carriage ____ already seven other people.
A. when there were B. which there were C. that there were D. where there were
31. I live in the house ____ windows face south.
A. which B. whose C. where D. in that
32. ---- What game is popular with them? ---- The ____ most is tennis.
A. game they like it B. game they like C. best game they like D. best game they like it
33. They stayed with me three weeks, ____ they drank all the wine I had.
A. which B. which time C. during which time D. during which
34. The room ____ Mr White lives is not very large.
A. that B. which C. where D. when
35. Don’t forget the day ____ you were received into the Youth League.
A. when B. that C. at which D. where
36. I’ve finished writing the novel, ____ is to be published next month.
A. that B. what C. which D. when
37. He returned home safe and sound after a fierce battle, ____ was unexpected.
A. which B. as C. that D. it
38. ____ we is known to all, English is not very difficult to learn.
A. What B. As C. That D. Which
39. The old man had three sons, all of ____ died during World War Ⅱ.
A. whose B. that C. whom D. who
40. I have bought two pens, ____ write well.
A. none of which B. neither of which C. both of which D. all of which
41. Do you know the reason ____ she has changed her mind?
A. why B. which C. for that D. of which
42. He failed in the exam, ____ proves that he wasn’t working hard enough.
A. which B. what C. it D. that
43. During the week ____ he tried to collect materials for his article.
A. following B. followed C. to follow D. that followed
44. ____ was expected, he succeeded in the exam.
A. It B. Which C. As D. That
45. He studied hard and later became a well-known writer, ____ his father expected.
A. that was what B. what was that C. and which was D. which was what
46. We should read such books ____ will make us better and wiser.
A. when B. as C. whose D. what
47. You must show my wife the same respect ____ you show me.
A. when B. as C. whose D. what
48. He is absent ____ is often the case.
A. what B. which C. who D. as
49. It is the first time ____ I have come to your city.
A. that B. which C. what D. when
50. Who ____ has the same idea as it will do it in this way.
A. who B. that C. whom D. which
51. I shall never forget those years ____ I lived in the country with the farmers, ____ has a great effect on my life.
A. that, which B. when, which C. which, that D. when, who
52. This is the only book ____ I can find.
A. that B. which C. it D. with which
53. I don’t like ____ you speak to her.
A. the way B. the way in that C. the way which D. the way of which
54. That is one of those books that ____ worth reading.
A. is B. are C. has D. have
55. This is the only one of the students whose handwriting ____ the best.
A. is B. are C. has D. have
56. There was ____ to prevent the accident.
A. something could do B. anything we could do
C. nothing we couldn’t do D. nothing we could do