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Iliketheapple.Theappleisred.Iliketheapplethatisred.2、ThemanwhoiswearingaredtieisClinton.句子做定语1、WenJiabaoisthemanthatisgivingatalk.句子做定语一、定语从句：•在复合句中，修饰某一名词或代词的从句叫定语从句。•eg:Ilikemusicthatisn’ttooloud.•Ilikewriterswhowriteshortstories.•先行词：被修饰的名词或代词。引导词：重复指代先行词，在从句中充当一定成分，且用以连接主句和从句的关系代词或副词。先行词引导词先行词引导词二、引导词的分类:关系代词：thatwhichwhowhomwhose引导词关系副词:wherewhenwhy引导词（关系词）既起连接作用，又在定语从句中充当一个成分。一先行词是人时引导词的用法：1、一般用关系代词who/whom/that2、who一般在从句中作主语3、whom在从句中作宾语，可以省略。a、Thisistheman_________hastaughtmeEnglish.b、Theyoungman__________youwanttoseehascome.who/that(whom/that)三、关系代词的用法二先行词是物时引导词的用法：1、一般用关系代词which/that，可互换。2、which/that如果在从句中作主语，不能省略。eg:Chinaisagreatcountrythat/whichhasabout5000yearsofhistory.3、which/that如果在从句中作宾语，常可省略。eg:Thisistheplace(that/which)hewouldliketovisit.三作定语的引导词：whose不论先行词是人或物，如果关系词在从句中作定语，只用whose引导。、Thebookwhosecoverisredisboring.、Sheisthegirlwhosefatherisapoliceman.a、当先行词被序数词修饰时eg:Wealllikethesecondlessonthatisaboutfood.b、当先行词被形容词的最高级修饰时eg：ThisisthemostinterestingstorythatIcanfindinthebook.四、只用that不用which的情况c、当先行词前有:only,few,any,much,very,last,all,every,little...等词修饰时。eg:HereisallthemoneythatIhave.d、当先行词为anything,nothing,something,everything等不定代词时。eg:HereissomethingthatIwanttotellyou.e、当先行词中既有人又有物时。eg：Lookattheboyandhisdogthatarecrossingtheroad.五、只用which不用that的情况a、引导词前有介词时。eg:ThisisthehouseinwhichTomoncelived.b、在非限定性定语从句（即通常用逗号与主句隔开，其整个句子仍然表达完整意义的定语从句）中。eg:TheyaretalkingabouttheTVplay,whichtheysawlastnight.四、关系副词的用法1、when:指时间,在定语从句中作时间状语。eg:IstillrememberthedaywhenIfirstcametotheschool.2、where:指地点，在定语从句中作地点状语。eg:Thehousewherehelivedhasbeenpulleddown.3、why:指原因，在定语从句中作原因状语。eg:Idon’tknowthereasonwhyhelooksunhappy.五、注意情况1、如果先行词是表地点的名词，且关系词在从句中作地点状语，用关系副词where引。Thisisthehouse_____Ilivedfouryearsago.Thisisthehouse__________Ilivedinfouryearsago.2、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。which/that如果关系词在从句中作其他成分，只能用关系代词that/whichwhere比较句子Thisisthehousein______Ilivedfouryearsago.如果定语从句前有介词，关系词只能用whichwhichwhere3、含有介词的动词短语一般不拆开使用，如：lookfor,lookafter,takecareof等。eg:Thisisthewatchwhich/thatIamlookingfor.ThisisthewatchforwhichIamlooking.(T)(F)六、中考链接1)Sorry,wedon’thavethecoat___youneed.AwhatBwhoCwhomDwhich(09年河北）2)Idon’tknowtheteacher____istalkingwithMissWang.AwhatBwhomCwhichDwho(09年淄）3)ThewholeworldisfightingagainsttheH1N1,adisease____hascausedmanydeaths.AwhoBwhichCwhomDwhat(09年绍）4)Iliketheteacher____classesareveryinterestingandcreative.AwhichBwhoCwhatDwhose(09年兰州）5)Allthechildrenliketheteachers____canunderstandthem.AwhatBwhichCwhoDwhose(09年浙江湖）