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定语从句中关系代词的使用什么是定语从句？担任定语用法的句子叫做定语从句。因此定语从句又被称为形容词性从句。定语从句的结构是？先行词+关系词+从句e.g.Sheisthegirlwhoisthemostcleverinourschool.Thisisanoldcomputerwhichworksslowly.怎么判断一个从句是定语从句呢？可以依据定语从句的结构进行判断，看到先行词和关系词后接从句并且翻译为“……的”的句子就是定语从句了。关系词是做什么用的？引导定语从句的词称为关系词。关系词的分类关系词关系代词关系副词介词+关系代词关系代词常见的关系代词有which,that,who,whom,whose,as。注意：定语从句不能用what引导。既然是关系“代词”，那么是不是说他们是有指代的对象呢？没错，关系代词在定语从句中作主语，宾语，表语，定语等。Examples：Thisisanoldcomputer.Thisoldcomputerworksslowly.将上两句结合起来后就是：Thisisanoldcomputerwhichworksslowly.e.g.TheplacethatinterestedmemostwastheChildren'sPalace.Theplaceinterestedmemost.TheplacewastheChildren’sPalace.who和whom作关系代词的用法。二者都用于指人，who在定语从句中作主语、宾语，whom在定语从句中作宾语。在定语从句中who不能做介词的宾语，whom则可以。e.g.ThisisthedoctorwhohasjustcomebackfromU.S.A.IhavemanyfriendstowhomIamgoingtosendpostcards.注意：一些固定的“动词+介词”固定结构不能把介词提到关系代词前，否则会失去其习语的含义。比如lookfor,carefor,dealwith,hearfrom，getthrough等。e.g.ThisistherightmodelforwhomI’mlooking.(X)ThisistherightmodelwhomI’mlookingfor.练习：将下列句子合成用who或者whom引导的定语从句。Heistheonlyone.Hecansolvetheproblem.Key:Heistheonlyonewhocansolvetheproblem.Thereisnotasingleperson.Shecanturntosomebodyforhelp.Key:Thereisnotasinglepersontowhomshecanturntosomebodyforhelpwhose作关系代词的用法whose一般指人，但有的时候也能指物。当先行词在从句中以所有格形式进行使用时，一般要用whose。Youaretheonlyone.Hemightlistentoyouridea.得出结论是:Youaretheonlyonewhoseideahemightlistento.练习：将下列句子合成用whose连接的定语从句：I’dlikearoom.Theroom’swindowlooksoutoverthesea.Key:I’dlikearoomwhosewindowlooksoutoverthesea.Pleasepassmethedictionary.Thedictionary’scoverisblack.Key:Pleasepassmethedictionarywhosecoverisblack.which作关系代词的用法which一般指代物，在定语从句中做主语，宾语，偶尔做定语。e.g.Egyptisacountrywhichisfamousforitspyramids.你能把上面这个句子拆开么？Egyptisacountry.Thecountryisfamousforitspyramids.练习：将下列句子合成一个which引导的定语从句：Theriverrunsthroughthecentreofthecity.Theriverbringsuslotsofpleasures.Key:Theriverwhichrunsthroughthecentreofthecitybringsuslotsofpleasures.Thatismyhome.Myhousestandsatthetopofthemountain.Key:Thatismyhomewhichstandsatthetopofthemountain.that做关系代词的用法that常用来指人或物，在从句中可作主语，宾语，和表语。在做宾语和表语的时候可以省略。e.g.Thepicture(that)wearestudyingwasdrawnbyafifteen-year-oldstudent.Thisisall(that)Icando.瞧一瞧：下面的句子你能拆开么？1.Ihavebeentothecitytwice(that)youjustvisited.Key:Ihavebeentothecitytwice.Youjustvisitedthecity.2.Isoxygentheonlygasthathelpsfireburn?Key:Isoxygentheonlygas?Gashelpsfireburn.as作关系词的用法as引导定语从句常出现在such…as…,thesame…as…，as…as…,或者so…as…等结构中。as引导定语从句时，在主句中常作主语，宾语，表语等。e.g.Thehuntertookonlysuchthingsashereallyneededintothejungle.上面的句子可以拆成：Thehuntertookonlysuchthingsintothejungle.Hereallyneededsuchthings.注意：thesame…as…和thesame…that…都表示“和……相同”，thesameas强调的是类型的相同thesamethat强调的是物体本身的相同.e.g.StudentAhasthesamebookasStudentBhas.A学生使用的教材和B同学的是同样的。TodayIusethesamebookthatisusedyesterday.我今天使用的和昨天使用的是同一本教材。练习：1.Theengineer_____myfatheristalkinghasjustcomefromabroad.A.withwhomB.withwhoC.withwhichD.that2.All_____isneededisasupplyofoil.A.thethingB.thatC.whatD.as3.Ihaveneverseensuchacleverboy______you.A.whichB.thatC.asD.what4.Hisparentswouldn’tlethimmarryanyone_______familywaspoor.A.ofwhomB.whomC.ofwhoseD.whose5.Helivesinahotel_____isonlyfiveminutes’walkfromhere.A.thatB.whichC.inwhichD.where