定语从句在复合句中，修饰一个名词或代词的从句叫做定语从句；被定语从句所修饰的词叫先行词；定语从句必须放在先行词之后；引导定语从句的词叫关联词。如：关联词常见的关联词有关系代词that，which，who，whom，whose和关系副词where，when，why等。种类1由that引导的定语从句一般情况下that可指人或物，可以代替who，whom和which，在从句中作主语或谓语动词的宾语，但不能作介词的宾语。如：The comrade that（who）is speaking at the meeting is an advanced worker正在会上讲话的那个同志是个先进工人。 Is this the doctor that（whom）you talked about yesterday？这就是你们昨天谈论的那位医生吗？The letter that（which）I received yesterday was from my father昨天我收到的信是我父亲寄来的。2由who，whom和whose引导的定语从句Who指人，在从句中作主语，whom在从句中作宾语，whose在从句中作定语。如：This is the thief who stole my bike这就是偷我自行车的那个贼。He is the boy whom you wanted to find他就是你想要找的那个男孩。The girl whose mother is a doctor is waiting for you outside妈妈是个医生的那个女孩在外面等你。3由which引导的定语从句which指事物，在从句中作主语或谓语动词的宾语。如：The book which Mum bought me last week is called“Red Star Over China”妈妈上周买给我的那本书名叫西行漫记。The house which Lu Xun once lived in is now the Lu Xun Museum鲁迅曾经住过的那所房子现在是鲁迅博物馆。4由where，when和why引导的定语从句Where指地点，在从句中作地点状语，when指时间，在从句中作时间状语，why指原因，在从句中作原因状语。如：I will never forget the day when I joined the League我永远忘不了我入团的那一天。He will go back to the school where he studied next week下周他要回到他曾经学习过的学校。I dont know the reason why he quarreled with Zhang Lin我不知道他同张琳吵架的原因。注意点关系代词在定语从句中作宾语时，关系代词常省去。如：The play（which）I watched just now had been on twice on Channel 3我刚才看的那个戏剧在3频道上已上演了两次。Multiple choice: 1. He came back to the village _ he spent years in his childhood. A. which B. that C. 不填 D. in which2. The village _ he stayed for five years has disappeared in the map. A. whichB. thatC. 不填 D. where3. How can I forget the days _ we spent together? A. whichB. whenC. in whichD. where4. He did not give the reason _ he was late for school. A. that B. which C. why D. how5. The reason _ he told us at the meeting turned out to be a made-up story. A. thatB. whyC. for whichD. when6. Jack chose to become a political fighter after college, _ was against his parents will. A. itB. asC. whichD. that7. Who was the man _ you talked a moment ago? A. thatB. whoC. whomD. to whom8. Most of the land areas _ were covered by trees before have become deserts. A. whereB. whichC. in whichD. 不填9. The book _ I spent 30 yuan is well worth reading. A. which B. on which C. that D. on that10. I still remember the little wooden room _ my brother and I used to sit in the evening. A. what B. which C. that D. in which11. 23. He is the only one of those boys who never _ late for school. A. hasB. haveC. comeD. comes12. The speaker spoke of some writers and some books _were popular then. A. 不填 B. that C. which D. who13. This is the reason_ he is leaving now.A. that B. which C. why D. 不填14. It is for this reason _ he is leaving now. A. thatB. whichC. whyD. 不填15. No one would believe the reason _ he gave for his absence from the meeting. A. which B. why C. for which D. to which16. In the last years we planted thousands of young trees around our village, _ two thirds have survived the drought.A. 不填 B. which C. which of D. of which17. Such a man_ you described doesnt seem to have ever existed.A. which B. that C. as D. who18. I have the same magazine_ you bought just now. A. which B. like C. that D. as19. Those houses are sold at such a low price _ people expected. A. like B. as C. that D. which20. I have never heard so strange a story_ he told us.A. that B. which C. but D. as22. The British are not familiar with different cultures and other ways of doing things, _ is often the cases in other countries.A. that B. so C. it D. as23. Any student _ are below 50% must retake the examination. A. who has test resultsB. whose test results C. the test results of whomC. of whose test resutlts24. There have been some cases _ women employees were fired because they are pregnant. A. thatB. whichC. in whichD. with which25. Can you think of a situation _ this word can be used as a verb? A. thatB. whichC. in whichD. 不填26. Can you tell me the name of the factory _ you visited last week?A. as B. where C. 不填 D. when27. We all have heard of Thomas Edison, _ invented the electric light and many other things.A. one B. the one C. a man D. who28. The day will come _ the people all over the world will live in peace. A. that B. where