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一.定语从句的基本定义放在名词或代词后面，由关系代词或关系副词引导的修饰该名词或代词的从句叫定语从句。被修饰的词叫先行词。一.定语从句的基本定义TheboywhoisreadingisTom.先行词关系代词Hospitalisaplacewhereadoctorworks.先行词关系副词二.关系词的分类1.关系代词2.关系副词关系代词在定语从句中作主语、宾语、表语和定语，常用的关系代词有：that,which,who,whom,whose关系副词在定语从句中作状语，常用的关系副词有：when,where,why二.关系词的分类三.关系代词的基本用法和注意点1.关系代词的基本用法三.1.关系代词的基本用法关系代词指代的先行词充当从句的成分who人主语、宾语whom人宾语which物主语、宾语that人或物主语、宾语、表语whose人或物定语①who指人,在定语从句中作主语或宾语。作宾语时，可省略。Theman(who)Italkedwithisourteacher.Apersonwhostealsthingsiscalledathief.②whom指人,在定语从句中作宾语，可省略。Theman(whom)InoddedtoisMr.Li.who,whom③which指物，在定语从句中作主语或宾语。作宾语时，可省略。Thesearethetreeswhichwereplantedlastyear.Thisrecorder（which）heisusingismadeinJapan.whichHeistheman(that)Itoldyouabout.④that指人或物，在定语从句中作主语或宾语。作宾语时，可省略。Aplaneisamachinethatcanfly.that⑤whose指人或物,在定语从句中作定语。不可省略。Weliveinahousewhosewindowsfacesouth.Thisisthelittlegirlwhoseparentswerekilledinthegreatearthquake.whose2.关系代词的用法注意点(1)that和which都可以指物，但以下5种情况只能用that不能用which。①当先行词中有人又有物时。如：Doyouknowthethingsandpersonsthattheyaretalkingabout?2.关系代词用法注意点(1)只能用that不能用which的5种情况②当先行词为不定代词all,one,few,little,no,some,any,everything,nothing,nobody,none等时。如：ThisisallthatIwantfromtheschool.③当先行词被only,just,very,right,last等修饰时。如：ThisistheverybookthatIamlookingforthesedays.④当先行词被最高级修饰时。如：TheTVtoweristhehighestbuildingthathasbeenbuiltinthiscity.⑤当先行词被序数词修饰时。如：ThefirstlessonthatIlearnedwillneverbeforgotten.(2)that和who都可以指人，但下面两种情况，多用who。(2)用who不用that的情况①先行词为all,anyone,one,ones等时。如：Allwhoheardthenewswereexcited.②先行词为those,he和people时。如：Thosewhowanttogopleasesignyournameshere.HewhodoesnotreachtheGreatWallisnotatrueman.(3)whose引导的定语从句注意点①whose引导定语从句，其后应紧跟名词，构成名词短语。②whose与它所修饰的名词一起可以作介词的宾语。如：Thebossinwhosedepartmentheworkedhadheardthenews.他工作所在部门的老板已经听说了这个消息。(3)whose引导的定语从句注意点④whose的先行词指物时，可用ofwhich代替，但语序不同，即whose+名词=the+名词+ofwhich，或=ofwhich+the+名词。如：Thenovelwhosetitle(=thetitleofwhich或ofwhichthetitle)isRedandBlackisveryinteresting.③whose引导的定语从句，其先行词既可以指人也可以指物。⑤whose的先行词指人时，可用ofwhom代替，但语序不同，即whose+名词=the+名词+ofwhom，或=ofwhom+the+名词。如：Theboywhosemother(=themotherofwhom或ofwhomthemother)isadoctorismyfriend.(4)关系代词在从句中作主语时，从句的谓语动词的人称和数必须与先行词保持一致。如：Thosewhoareagainsttheplanputupyourhands.Tomisoneofthestudentswhowerepraisedbytheteacheryesterday.Tomistheonlyoneofthestudentswhowaspraisedbytheteacheryesterday.(4)从句中的谓语动词与先行词保持一致Thescientistwhowemetyesterdayisveryfamouswhomintheworld.thatØ(2)Thedressisnew.Sheiswearingit.Thedresswhichsheiswearingisnew.thatØ(1)Thescientistisveryfamousintheworld.Wemetheryesterday.巩固练习：1.用定语从句合并句子巩固练习1：用定语从句合并句子(3)Heisthekindperson.Ihaveeverworkedwithhim.(4)Thisisthebestfilm.Ihaveeverseenthisfilm.HeisthekindpersonwhoIhaveeverworkedwith.whomthatØThisisthebestfilmthatIhaveeverseen.Ø1.Thegirl__________isstandingnexttoourteacherisherdaughter.2.Thegirl_________________ourteacheristalkingwithisafamoussinger.3.Thegirl________motherisateachercanspeakEnglishverywell.4.Ican’tfindthebook____________isborrowedfromthelibrary.5.Ican’tfindthebook________________youlenttome.who/that(who/whom/that)whosewhich/that(that/which)巩固练习：2.用适当的关系词填空巩固练习2：用适当的关系词填空四.介词+which/whom引导的定语从句1.介词的选用原则：(1)根据定语从句谓语动词的习惯搭配来决定。ThisisthebookonwhichIspent8dollars.ThisisthebookforwhichIpaid8dollars.四.“介词+which/whom”引导的从句，1.介词选用原则(2)根据先行词的习惯搭配来决定。IrememberthedayonwhichIjoinedtheParty.IrememberthedaysduringwhichIlivedthere.2.当介词放在关系代词前面时，关系代词只能用whom(指人)或which(指物)，且关系代词不能省略。Themanwithwhomyoutalkedjustnowismyneighbor.Ican’tfindthepenwithwhichIwaswriting.2.介词位于关系代词前，关系代词的使用3.当介词位于定语从句末尾时，可用which/that(指物),who/whom/that(指人)作从句中介词的宾语.而且作介词宾语的关系代词可以省略。(whom/who/that)(which/that)Dadisaperson________________Icaneasilytalkto.Isthistheplay___________youweretalkingaboutjustnow?3.介词位于句末，关系代词的使用4.在一些固定搭配的动词短语中，由于动词和介词不可分割，因此不能把介词置于关系代词之前。如：Thisisthewatch(that/which)Iamlookingfor.Thebabies(who/whom/that)thenurseislookingafterareveryhealthy.4.含介词的固定搭配动词短语的使用5.先行词是theway，意为“方式，方法”时，引导定语从句的关系词用that/inwhich或省略。Ididn'tliketheway_______________shetalkedtome.Theway_________________heteachesEnglishisinteresting.（that/inwhich）（that/inwhich）5.先行词为theway，关系词的使用五.关系副词when,where和why的用法五.关系副词的基本用法关系副词指代的先行词充当从句的成分when表时间的名词/名词词组时间状语where表地点的名词/名词词组地点状语why表原因的名词原因状语用关系副词when时，先行词指时间，when在定语从句中作时间状语，when可换成“介词+关系代词”。如：Istillrememberthedaywhen(=onwhich)IfirstcametoNanjing.Myfatherwasbornintheyearwhen(=inwhich)WorldWarⅡbrokeout.1.when1.when用关系副词where时，先行词指地点，where在定语从句中作地点状语，where可换成“介词+关系代词”。如：Thisisthefarmwhere(=onwhich)weworkedwhenwewereyoung.Theschoolwhere(=inwhich)hismotherteachesisinthewestofthecity.2.where2.where用关系副词why时，先行词指原因，why在定语从句中作原因状语，why可换成“介词+关系代词”。如：Thereareseveralreasonswhy(=forwhich)theboysshouldbepunished.Tomcouldn’tgivetheteacherthereasonwhy(=forwhich)hewaslateforschool.3.why3.why4.关系副词的用法注意点(1)当先行词为time，表示“次数”时，应用关系词that或省略。如：Thisisthefirsttime(that)thepresidenthasvisitedthecountry.(2)当point,situation,case等词作先行词表示“情况，境地，场合”等意思时，其后常由where引导定语从句，where在句中作状语。如：Canyouthinkofasituationwherethisphrasecanbeused?4.关系副词的用法注意点巩固练习：用适当的关系词填空1)October1,1949wastheday______(________)Chinawasfounded.2)Beijingistheplace______(________