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定语从句定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，定语从句分为限定性和非限定性从句两种。一.定语从句及相关术语1.定语从句：修饰一个名词或代词的从句称为定语从句，一般紧跟在它所修饰的先行词后面。2.关系词：引导定语从句的关联词成为关系词关系词有关系代词和关系副词。关系代词有that,which,who,whom,whose,as等；关系副词有where,when,why等。关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。二.关系代词引导的定语从句1.who指人，在从句中做主语(1)TheboyswhoareplayingfootballarefromClassOne.(2)YesterdayIhelpedanoldmanwholosthisway.2.whom指人，在定语从句中充当宾语，常可省略。(1)Mr.Liuistheperson(whom)youtalkedaboutonthebus.(2)Mr.LingisjusttheboywhomIwanttosee.注意：关系代词whom在口语和非正式语体中常用who代替，可省略。(3)Themanwho/whomyoumetjustnowismyfriend.如果在从句中做宾语,就用whom或who.比如:Heisthemanwhom/whoItalkto.如果是在从句中作主语就只能用who.比如:HeisthemanwhohasanEnglishbook.3.which指物，在定语从句中做主语或者宾语，做宾语时可省略(1)Footballisagamewhichislikedbymostboys.(2)Thisisthepen(which)heboughtyesterday.4.that指人时，相当于who或者whom；指物时，相当于which。在定语从句中做主语或者宾语，做宾语时可省略。(5)Thenumberofthepeoplethat/whocometovisitthecityeachyearrisesonemillion.(6)Whereisthemanthat/whomIsawthismorning?5.whose通常指人，也可指物，在定语从句中做定语(1)Hehasafriendwhosefatherisadoctor.(2)Ioncelivedinahousewhoseroofhasfallenin.whose指物时，常用以下结构来代替（ofwhich）(3)Theclassroomwhosedoorisbrokenwillsoonberepaired.(4)Theclassroomthedoorofwhichisbrokenwillsoonberepaired.(5)Doyoulikethebookwhosecoverisyellow?(6)Doyoulikethebookthecolorofwhichisyellow?三.介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导(1)Theschool(that/which)heoncestudiedinisveryfamous.(2)Theschoolinwhichheoncestudiedisveryfamous.(3)TomorrowIwillbringhereamagazine(that/which)youaskedfor.(4)TomorrowIwillbringhereamagazineforwhichyouasked.(5)We’llgotohearthefamoussinger(whom/that/who)wehaveoftentalkedabout.(6)We’llgotohearthefamoussingeraboutwhomwehaveoftentalked.注意：1.含有介词的动词短语一般不拆开使用，如：lookfor,lookafter,takecareof等(1)Thisisthewatchwhich/thatIamlookingfor.(T)(2)ThisisthewatchforwhichIamlooking.(F)2.若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose(1)Themanwithwhomyoutalkedismyfriend.(T)(2)Themanwho/thatyoutalkedwithismyfriend.(F)(3)TheplaneinwhichweflewtoCanadaisverycomfortable.(T)(4)TheplaneinthatweflewintoCanadaisverycomfortable.(F)3.“介词+关系代词”前可有some,any,none,both,all,neither,most,each,few等代词或者数词(1)Helovedhisparentsdeeply,bothofwhomareverykindtohim.(2)Inthebaskettherearequitemanyapples,someofwhichhavegonebad.(3)Therearefortystudentsinourclassinall,mostofwhomarefrombigcities.四．关系副词引导的定语从句1.when指时间，在定语从句中做时间状语(1)IstillrememberthedaywhenIfirstcametotheschool.(2)Thetimewhenwegottogetherfinallycame.2.where指地点，在定语从句中做地点状语(1)ShanghaiisthecitywhereIwasborn.(2)ThehousewhereIlivedtenyearsagohasbeenpulleddown.3.why指原因，在定语从句中做原因状语(1)Pleasetellmethereasonwhyyoumissedtheplane.(2)Idon’tknowthereasonwhyhelooksunhappytoday.注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换(1)Thereasonwhy/forwhichherefusedtheinvitationisnotclear,(2)Fromtheyearwhen/inwhichhewasgoingtoschoolhebegantoknowwhathewantedwhenhegrewup.(3)Greatchangeshavetakenplaceinthecityinwhich./whereIwasborn.五、判断关系代词与关系副词方法一：用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：ThisisthemountainvillagewhereIstayedlastyear.Thisisthemountainvillage(which)Ivisitedlastyear.I'llneverforgetthedayswhenIworkedtogetherwithyou.I'llneverforgetthedays(which)Ispentinthecountryside方法二：准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词(who,whom,that,which,whose)；先行词在从句中做状语时，应选择关系副词(where地点状语，when时间状语，why原因状语)六．限制性定语从句和非限制性定语从句限制性定语从句非限制性定语从句形式上不用逗号和主句隔开用逗号和主句隔开意义上是先行词不可缺少的定语，不能删除是对先行词的补充说明，删除后意思仍完整译法上翻译成先行词的定语，“…的…”通常翻译成主句的并列句关系词的使用上A.做宾语时可省略B.可用thatC.可用who代替whomA．不可省B。不用thatC。不用who代替whom限制性定语从句举例：(1)TheteachertoldmethatTomwastheonlypersonthatIcoulddependon.(2)Chinaisacountrywhichhasalonghistory.非限制性定语从句举例：(1)Hismother,wholoveshimverymuch,isstrictwithhim.(2)China,whichwasfoundedin1949,isbecomingmoreandmorepowerful.（一）限定性定语从句1.that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置2.which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢3.代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括all,anything,much等，这时的that常被省略4.who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语5.where是关系副词，用来表示地点的定语从句6.when引导定语从句表示时间［注］值得一提的是，表示时间“time”一词的定语从句不用when引导，有时不用任何关系代词，或用that引导BythetimeyouarriveinLondon,wewillhavestayedtherefortwoweeks.IstillrememberthefirsttimeImether.Eachtimehegoestobusinesstrip,hebringsalotoflivingnecessities,suchastowers,soap,toothbrushetc.7.whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格8.当从句的逻辑主语是some,any,no,somebody,anybody,nobody,something,anything,everything或nothing时，常用thereis来引导（二）非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立1.which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分2.在引导限定性定语从句时，that有时相当于inwhich,atwhich,forwhich或atwhichAttitudestowardsdaydreamingarechanginginmuchthesamewaythat(inwhich)attitudestowardsnightdreaminghavechanged.人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。Ilikethemusicfortheveryreasonthat(forwhich)hedislikeit.我出于某种原因喜欢这种音乐，而他恰恰与我相反。Wearrivedthedaythat(onwhich)theyleft.刚好我们到的那天他们走了。3.有时as也可用作关系代词4.在非限定性定语从句中，不能用that，而用who,whom代表人，用which代表事物.八、关系代词as和which引导的定语从句as和which引导非限制性定语从句，有相同