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。
关系代词有: that, which, who, whom, whose, 等
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。 The man who is shaking hands with my father is a policeman.
1.who 指人，在定语从句中 作主语。 The boys who are playing football are from Class One. Those who want to go to the museum must be at the school gate at 7 tomorrow morning.
Yesterday I helped an old man who had lost his way.
That is the teacher who teaches us physics.
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. Li Ming is just the boy ( whom ) I want to see.
The professor ( whom ) you are waiting for has come.
The girl ( whom ) the teacher often praises is our monitor.
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.
The factory which makes computers is far away from here.
He likes to read books which are written by foreign writers. The house which is by the lake looks nice. This is the pen ( which ) he bought yesterday. The film ( which ) they went to see last night was not interesting at all.
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.
Where is the man that / whom I saw this morning? The person that /whom you introduced to me is very kind. The season that / which comes after spring is summer.
Yesterday I received a letter that / which came from Australia.
Up to now, he has written ten stories, three of which are about country life.
A．作宾语时可省略 B．不可省略 A．可用that B．不用that A．可用who 代替 whom B．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. China is a country which has a long history. In the street I saw a man who was from Africa.
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。）
（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。
Have you taken down everything that Mr. Li said?
There seems to be nothing that is impossible to him in the world.
All that can be done has been done.
There is little that I can do for you. He stayed in the library and looked up any information that they needed.
All the guests that / whoawere Any man that / who has invitedof duty wedding such a sense to her won’t do were important people. thing. Any man that / who has a sense of duty won’t do such a thing.
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。
The news that he told me is true. The news that he has just died is true. The problem that we are facing now is how we can collect so much money. The problem how we can collect so much money is difficult to solve.
The question that he raised puzzled all of us.
The question whether he is sure to win the game is hard to answer.
B. The fact that the earth moves around the sun is known to all.
The fact is that the earth moves around the sun.
1. Dorothy was always speaking highly of her role in the play, of course, _____ made the others unhappy. A. which B. who C. this D. what
2. After living in Paris for fifty years he returned to the small town _______ he grew up as a child. A. which B. when C. that D. where
3. The gentleman _______ you told me yesterday proved to be a thief. A. who B. about whom C. whom D. with whom
4. Please take any seat ____ is free. A. which B. where C. in which D. that