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1、几个易混淆的关系代词的比较:(A)that&which:在定语从句中，which和that在指代事物时，一般可以互换使用，但并非在任何情况下都是这样，这里介绍宜用that,而不宜用which的情况.(1)先行词为不定代词，如all,much,something,everything,anything,nothing,none,theone等。如：1.Weshoulddoallthatisusefultothepeople.2.There'snothingthatcanbesaidaboutit.3.Doyoumeantheonethatwasb
2、oughtyesterday?(2)先行词被only,any,few,little,no,just,very,oneof等词修饰时。如：1.Theonlythingthatwecoulddowastowait.2.That'stheverywordthatiswronglyused.3.Thelastplace(that)wevisitedwasthechemicalworks.4.Youcantakeanyseatthatisfree.(3)先行词是序数词时或被序数词修饰时。如：1.WhenwetalkaboutWuxi,thefirstth
3、atcomesintomindisTaiLake.2.Thisisthethirdfilmthathasbeenshowninourschoolthisterm.(4)先行词是最高级或被最高级修饰时。如：1.Thisisthebestthatcanbedonenow.2.Themostimportantthingthatshouldbedonerightnowishowtostophimfromgoingon.(5)先行词既有人又有物，用which和who都不适合，这时宜用that.如：1.Thewriterandhisnovelthatyou
4、havejusttalkedaboutisreallywellknown.2.Theriderandhisbikethathadrunoveranoldwomanwereheldupbythepolice.(6)被修饰词为数词时.如：1.YesterdayIcaughttwofishandputtheminabasinofwater.Nowyoucanseethetwothatarestillalive.(7)如果有两个从句，其中一个关系代词已用which,另一个关系代词宜用that，以避免语言的单调或重复。如：1.Edisonbuiltupa
5、factorywhichproducedthingsthathadneverbeenseenbefore.(8)疑问词是who或which，关系代词宜用that，以避免重复。如：1.Whichisthebookthatyoulikebest?2.Whoisthemanthatisstandingatthegate?(9)主句是Therebe结构，修饰其主句的定语从句宜用that作关系代词.如：1.Thereisstillaseatinthecornerthatisstillfree.(10)被修饰成分为表语时，或者关系代词本身是定语从句的表语时
6、，该关系代词宜用that.如：1.That'sagoodbookthatwillhelpyoualot.2.Myhomevillageisnolongertheplace(that)itusedtobe.定语从句中宜用which而不宜用that的情况:(1)当关系代词的前面有介词时.如：1.Azooisaparkinwhichmanykindsofanimalsarekeptforexhibition.2.IsthistheroominwhichMr.Whitelives?(2)在非限制性定语从句中.如：1.Crusoe'sdog,whichw
7、asarenowveryold,becameillanddied.2.MoreandmorepeoplearebeginningtolearnEnglish,whichisbecomingverypopularinourcountry.(which指代主句)定语从句三步：第一找出先行词；第二看先行词在定语从句中的语法功能（做主语、宾语或状语）；第三选择合适的关系词。1.Aletterthat/whichiswritteninpencilisdifficulttoread.2.Doyouknowthegentlemanthat/whospokej
8、ustnow?3.Youcantakeanything(that)youlike.4.Whatisthequestion(that/which)the
