定语从句考点透视基本概念：一个句子充当定语称之为定语从句。被修饰限定的词叫先行词，引导定语从句的词叫关系词，包括关系代词和关系副词。定语从句可分为两种，即限制性定语从句和非限制性定语从句。正确使用关系词关系词关系代词that主语which宾语whom人或物表语whose定语as关系副词when时间where地点状语why原因选择依据：1）弄清关系词在从句中作什么成分，是主语、宾语、定语还是状语2）辨别先行词表示的是人、物、事还是时间、地点、原因3）判断从句是限制性的还是非限制性的(只有that,why不能引导非限制性从句)考点一：关系代词that和which在很多情况下可以互换，但哪些情况只能用that?在以下几种场合只能用thatA.先行词(指物)本身是不定代词或先行词被不定代词修饰Allthatcanbedonehasbeendone.B.先行词兼有指人和指物的名词C.先行词(指物)被thevery,theonly,thenext,thelast等修饰D.先行词(指物)被形容词最高级和序数词修ThisisthebestTVthatismadeinChina.E.当主句是which/who引导的特殊疑问句Whothatyouhaveeverseencandoitbetter?考点二：有哪些情况关系代词不用that，而用which，who，whom?Fillintheblanks:１．Hemadethesamemistakesagain,_____madehisparentsveryangry.２．YesterdayIboughtadictionary,_______costmemorethan100yuan.３．MrSmith,_______gaveatalkseveralmonthsago,willcomeagain.４．Myunclehascomebackfromabroad,______Ihaven’tmetforalongtime.1、在非限制性定语从句中，指事物用which，指人用who或whom2、在介词后面，指事物用which，指人用whom1.Herbag,inwhichsheputallhermoney,hasbeenstolen.2.Thisistheringonwhichshespent1000dollars.3.XiaoWang,withwhomIwenttotheconcert,enjoyedhimselfverymuch.考点三：在介词后面，指事物用which，指人用whom在定语从句中如何正确判断与使用介词?方法1.看定语从句中动词或形容词与介词的搭配1.Thegirl_____whomhehadfoughtallhislifenolongerseemedimportanttohim.2.Heistheman_____whomIthinkyoucandepend.3.Hereferredtosomereferencebooks______whichIamnotveryfamiliar.方法2.看从句中的动词或动词词组与先行词的搭配1.Hemadeaholeinthewall,______whichhecouldseewhatwasgoingonoutsidethehouse.2.Thelibrarian_____whomIjustshookhandsworksheartandsoul.方法3、根据先行词判断，所用的介词与先行词搭配1.Therate______whichwildanimalsarebeingdestroyedhasincreased.2.Thisisourclassroom,_______________（在前面）whichthereisateacher’sdesk.考点四：名词/代词/数词+of+which/whom知多少?Rewritethefollowingsentences1.Thecommitteeconsistsof20membersand5ofthemarewomen.2.Thebookcontains50poems,andmostofthemwerewrittenin1930s.3.Ihaveasentence,andthemeaningofitIdon’tunderstand.名词/代词/数词+of表示物用which表示人用whom考点五：如何恰当使用when,where,why与which,that引导的定语从句?1.先行词是表示地点,时间,原因的名词或含有地点,时间,原因意义的抽象名词，用来引导定语从句.when,where,why在从句中作状语，相当于相应的介词+which2.若定语从句缺主语或宾语，用which或that引导定语从句。Thisisthetown______________Ispentmychildhood.Thelibrary_____________youvisitedyesterdaywasbuiltin1990I’llneverforgettheday____________wefirstmetinthepark.I’llneverforgetthetime__________IspentwithyouThisisthereason_________________Ididn’tcomehere.Thereason__________shegavewasnottrue.考点六：如何用好whose引导的定语从句?whose表示所属关系1.Theriver_________banksarecoveredwithtreesflowstothesea2.Thereareinthisclass20students,______aredifferent.A.whosebackgroundsB.thebackgroundsofwhomC.ofwhomthebackgroundsD.thebackgroundsofwhose考点七：as和which的区别知多少？as作为关系代词，既可以引导限制性定语从句，又可以引导非限制性定语从句，在从句中做主语、宾语或表语.as引导的限制性定语从句此时先行词前常被such,thesame,so,as...