定语从句总结定语从句在句中相当于一个形容词，起定语的作用，修饰说明名词、代词或主语的全部内容。

通常在被修饰的词语（即先行词）之后，由“关系词”引导。

定语从句的三种功能：1.连接功能：连接从句，引导一个定语从句2.指代功能：指代先行词3.语法功能：在定语从句中充当句子成分(定语从句中的关系词分为关系代词和关系副词两种)that which who whom whose when where why注: 关系代词在句中充当主语、定语、宾语，因此定语从句中不能再出现关系代词所替代的名词或代词。

1.关系代词在从句中作主语时不能省略①A plane is a machine which / that can fly . (作主语)The dog which / that was lost has been found . (作主语)②The number of people who / that lost homes reached 250,000 .Here comes the girl who / that wants to see you .2.关系代词在句中作宾语时可省略①The noodles that / which I cooked were delicious .（作宾语）This is the book that / which I want to read .The letter that / which I received yesterday was from my father .②The girl who / that we saw yesterday is Mary .Mr Li is a man whom / who / that we should lear from .Do you know the man whom / who / that is talking to ?3.关系代词在从句中做定语①The novel whose cover was broken blongs to me .②Henery is the boy whose mother is our English teacher .I know the person whose company produces computers .This is the person whose story surprised everybody .4.关系代词在句中作表语时可省略（只能用that）She is not the girl that she was .定语从句中关系代词与关系副词的选择1.明确关系代词，关系副词在定语从句中的不同作用关系代词which , that , who在定语从句中作主语或在及物动词或介词后作宾语关系副词when , where, why在定语从句中作状语，即定语从句中不缺主语、宾语，只缺时间、地点或原因状语2.分析句子结构，明确句法成分关系词在从句中作宾语还是作状语，关键取决于从句中的谓语动词。

如果定语从句中谓语动词是及物动词，应观察其后有无宾语。

如果没宾语，则应考虑使用能充当宾语的关系代词which或that。

如果句子中有宾语，就考虑关系副词when或where等关系副词（when , where , why ）1.When的用法（在定语从句中做时间状语）I still remember the day when I first came to Beijing .We will never forget the happy time when we worked on the farm .He came at a time when (at which ) we needed help .2.where的用法（在定语从句中做地点状语）This is the house where we lived last year .The factory where his father works is in the west of the city .After living in Pairs for fifty years , he returned to the small town where he grew up as a child .3. why的用法（在定语从句中做原因状语）There are several reasons why we can’t do that .He could n’t give the teacher a good reason why he was late for school .Is this the reason why ( for which ) he refused our offer ?The reason why ( for which ) she was ill is that she had eaten bad meat .4. 比较I’ll never forget the days that / which I spent with my teacher .I’ll never forget the days when I worked with you .It is the house that / which was built two years ago .It is the house where / in which I was born .The reason which / that he gave was an excuse .The reason why he was late was the rain .Do you know the reason why he didn’t turn up ?只能用that的定语从句1. 先行词为不定代词all everying nothing anything little much none时或被这些词修饰时，关系代词只用thatAll that can be done has been done .2. 当先行词被形容词的最高级修饰时，只用thatThis is the most beautiful park that I have visited .The Titanic is the most dangerous film that I’ve ever seen .The best one that I’ll choose will be you .3. 当先行词被序数词the first , the second , the last等修饰时，只用thatThe first lesson that we have learned will never be easily forgotten .This is the last class that we will have this term .4.当先行词被the only , the very , the last修饰时，只用that( some any few much no very only )The only student that may be elected is in our class .I have no question that will be asked .There was little that interested him at the meeting .This is the very book that I am looking for .5.当先行词既指人又指物时We often talk about the persons and things that we remember .The characters and the animals that are in the picture are very native .The train ran over a boy and his dog that were just crossing the railroad .6.当主语是以who或which开头的疑问句时，为避免重复而用thatWho is the girl that is standing there ?Who is the boy that shook hands with you just now ？Which is the hotel that you stayed at last month ?7.当way做先行词时，关系代词可以有三种形式①that ②in which ③×I don’t like the way that / in which /×you speak to your mother like that .8.先行词在句中作表语Shanghai is no longer the city that it used to be .定语从句练习：1. This is the bag _____ my mother bought yesterday.A. thatB. whoC. whomD. this2. The man _____ lives next to us is my English teacher.A. whomB. whichC. whoD. /3. The girl _____ you saw in the street is Mary.A. thatB. whoseC. whichD. as4. Is this the factory _____ a lot of students visited yesterday?A. the oneB. whichC. whoD. whom6. The only language _____ is easy to learn is the mother tongue.A. whichB. thatC. /D. it7. The girl handed everything _____ she had picked up in the street to the police.A. whichB. in whichC. thatD. all9. Please show me the book _____ you bought yesterday.A. whichB. whomC. whoseD. this10. This is the best book _____ I have been looking for all this year.A. whoB. whomC. whichD. /11. This is the only article of these that _____ written by him.A. wasB. wereC. isD. are12. The man _____ was here just now is a doctor.A. whomB. whoC. /D. he13. The boy _____ has two lovely dogs.A. who live next doorB. which lives next doorC. whom lives next doorD. that lives next door14. Those _____ made no mistakes in today’s exercises please raise your hands.A. whichB. whomC. thatD. who15. The farm _____ we stayed last week is a lovely place for a holiday.A. whenB. whereC. thatD. at that16. He is the most careful boy _____ I know.A. whatB. whichC. asD. ./17. This is the school _____ Mr. Smith once taught.A. in thatB. whenC. whereD. there18. Have you visited the house _____ the famous scientist was born?A. whereB. in thatC. thatD. which19. The factory _____ Mr. Li used to work was closed last week.A. whenB. whereC. thatD. which20. Do you still remember the day _____ we first met?A. thatB. whenC. whatD. on that21. Octo ber 1,1949 is the day _____ we’ll never forget.A. whenB. thatC. whereD. in which22. October 1, 1949 was the day _____ the People’s Republic of China was founded.A. whichB. whenC. whereD. in which23. Is this the shop _____ sells children’s clothing?A. whichB. whereC. in whichD. what25. I still remember the sitting-room _____ my mother and I used to sit in the evening.A. whatB. whichC. thatD. where26. Have you seen the girl _____?A. that I toldB. I told you ofC. whom I toldD. I told of28. Finally the thief handed in everything _____ he had stolen to the police.A. whichB. thatC. whatD. whatever29. The lecture spoke of some writers and novels _____ were known to us all.A. whichB. thatC. whoD. what30. I can still remember the sitting room _____ my mother and I used to sit in the evening.A. whatB. whichC. thatD. where32. The only question _____ is to find our way home.A. that matteredB. that mattersC. which matteredD. matter34. The farmers used wood to build a house _____ grain can be stored.A. with whichB. whereC. in thatD. which1. -Do you know the man ______is talking with your father？-Yes，he’s our headmaster.A. heB. whoC. whichD. whom2. Is this the river _____I can swim？A. whichB. in whichC. thatD. the one3. This is the best hotel in the city _____I know.A. whereB. whichC. thatD. it4. Can you lend me the dictionary ______the other day？A. that you boughtB. you bought itC. that you bought itD. which you bought it5. Anyone ______with what I said may put up you hands.A. which agreesB. who agreeC. who agreesD. which agree6. My watch is not the only thing ______ is missing.A. thatB. itC. which who7. The man ______coat is black is waiting at the gateA. who’sB. whoseC. that of which.8. The girl ______ is reading under the tree _____my sister.A. which；isB. whom；wasC. who；isD. who；was9. I love places ______the people are really friendly.A. thatB. whichC. whereD. who10. The world ______ is made up of matter.A. in that we liveB. on which we liveC. where we live inD. we live inⅡ. 用适当的关系代词that，which，who，whom填空。