定语从句定语从句在句中充当定语是修饰名词的主谓结构，必须有先行词，在定语从句中，引导词必须充当成分1. 关系代词，关系副词（1）指人that who whom whoseeg: The man who lives next to us sells vegetablesThe girl (that/whom) we saw yesterday was Jim’s sisterThat’s the girl whose father is a teacher(2) 指物that which whoseeg: A plane is a machine that can flyThe noodles (that) I cooked were deliciousThis is the house whose window broke last night(3) 指地点where that which whoseeg: This is the factory where we worked last yearThis is the factory (that/which) we visited last yearcf: This is the factory where we visited some equipment last yearThis is the factory that/ which produces shoeseg: I stood next to the window from where I could see a beautiful gardencf: I stood next to the window and from there I could see a beautiful gardeneg: Where there is a will，there is a wayThat’s where you make mistakesYou should put back the books where they belongcf: You should put back the books at the place where they belongeg: Is this factory the one where we worked last year?cf: Is this factory where we worked last year?eg: It is in the classroom that I lent Tom money It is the classroom where I lent Tom moneycf: Where did you find Tom? It was in the hotel where we often met each other (that I found him) (4). 指时间when that whicheg: I’ll never forget the day s when we worked togetherI’ll never forget the days that或which we spent togethercf: I’ll never forget the day s when I spent my childhood in the countryTell me the exact time at which he is to arrive in Beijingeg: It is two o’clock when he gets up It is at two o’clock that he gets up(5). 指原因why for which that /eg: He doesn’t know the reason why/ for which/ that/ / his wife said that eitherThe reason why he was late for school was that he missed the busThe reason that he gave us was that he missed the bus(6). 指方式in which that /eg: He should tell me the way in which/ / / that he made moneyCould you tell me the way Tom thinks of to solve the problem?2. 只用that不用which的几种情况1）当先行词为all, little, much以及复合不定something, anything, nothing, everythingeg: There is nothing in the world that can frighten him Tell me all that are absentcf: The plane is something which/that can fly2). 当先行词被all, no, some, any, every, the last, the same, the very, just the, little, much等修饰eg: There is no art that stands above classesHe is the very boy that we are looking for3). 当先行词被序数词或形容词最高级修饰eg: This is the first step that we should take This is the most exciting basketball match that I have ever watched4). 当先行词为并列的人和物eg: They talked about the persons and things that most impressed themI saw a girl and a dog that are crossing the street5). 当主语是以who which 开头的特殊疑问句eg: Who is the man that called on you just now?Which of the subjects that you are studying is the most difficult?3. whose n = of which the n/the n of whicheg: That is a book whose cover \The cover of which \Of which the cover is blue4. one of 单独作主语谓语用单数eg: One of the students is often late在定语从句中，one前没有修饰词，从句谓语用复数，one前有the, the only, the very, just the等修饰，从句中谓语用单数eg: Tom is one of the students who are late for schoolTom is the/ the only/ the very/ just the one of the students who is late for school5. 只用which 用来引导非限制性定语从句或介词加whicheg: Grammar, which I like very much, is good for meThe knife with which I’m cutting the meat is very sharp6. 在非限制性定语从句中，all of few of many/most/none/some of…等结构中eg: It’s a family of eight people, all of who m love music He has many books, few of which are interesting 但若是句号，分号and/ so/ but以及为短语时，则用all of them/ iteg: He has many books./ ; most of them are interestingHe has many books and most of them are interestingHe has many books，most of them over 100 years7. but用作关系代词相当于that/who….noteg: He is world-famous，so there is nobody but knows of himThere is no difficulty but can be overcome8. 关系代词as经常与主句先行词被as such so the same等修饰，连用eg: Such a man as he (is) is not easy to get along with Have you ever seen as lovely goldfish as these?I told him the same story that/as you told me Here is so heavy a box as no one can lift 定从cf: Here is so heavy a box that no one can lift it 结从9. the same…..as 同类（one）The same…..that 同一（it）eg: That’s the same watch that/ as I have I want to use the same tool that/as you used yesterday cf: I want to buy the same coat as is on show on TV10. as , which都能代表前面主句整个意思而which只能放在主句之后eg: She was late for school, as/which made the teacher very angryAs everybody can see, the elephant is not like a wallHe wrote many books, some of which you will read some daycf: as is hoped as everyone can see As is well known as we knowAs often happens as we had expected As has been said before11. He lost the papers during the war, in which case he had to rewrite themDon’t call between 12 o’clock and 1 o’clock, during which time I am usually having lunch12. 先行词为case point conditions situation position等名词+ where从句在。