《定义及其作用》PPT课件.ppt

定义及其作用：定语从句是中学阶段英语语法中十分重要的一个语法项目，它在句子中出现的频率很高。对正确理解句子的意义起着举足轻重的作用。定语从句可分为：限制性定语从句和非限制性定语从句。定语从句一般都紧跟在它所修饰名词后面，所以如果在名词或代词后面出现一个从句，根据它与前面名词或代词的逻辑关系来判断是否是定语从句。,定语从句,先行词的作用被定语从句所修饰的名词或代词叫做“先行词”。引导定语从句的词叫“关系词”。关系词有两个作用：一、引导定语从句二、代替先行词在其引导的定语从句中充当一定的句子成份。理解和牢记这两条概念，弄清楚关系词在定语从句中充当什么成分，是掌握定语从句的关键。,修饰物体时关系代词that和which的区分使用that的情况：1、当先行词是nothing,something,anything,all,each等不定代词时。eg.Doyouhaveanythingthatisimportanttotellme?2、当先行词被all,any,some,no,not,every,each等修饰时。eg.Ihavesomebooksthatareverygood.3、当先行词被形容词最高级、序数词所修饰时。eg.ThisisthefirstbookthatIboughtmyself.ThebiggestbirdthatIcaughtisthisbird.,4、当先行词被thevery,thelast,thenext,theonly等词修饰时。eg.ThisistheverybookthatIlostyesterday.5、当先行词又有人又有物时。eg.IwontforgetthethingsandthepersonsthatIsaw.只能使用which的情况。1、非限制性定语从句中。eg.Maryhasabook,whichisveryprecious.2、在介词之后。eg.Thisisahouseinwhichlivesanoldman.3、当主句中的主语被that修饰时。eg.ThatdogwhichIfoundinthestreetbelongstoMary.,Consolidationexercises.Fillintheblankswithsuitablerelativepronouns.1.Thisistheonlybook_Igotlastyear.2.Isthisthebookin_youareinterested?3.Thisisthelargestanimal_Tomsawinthezoo.4.Rosestillremembersthetreesandteachers_exist(存在)inthemotherschool.5.Allthedesks_areboughtlookreallywonderful.6.Doyouhaveanymoney_isusedtobuildthefactory?7.Tomhasatoy,_wasgivenbyhisfather.8.Thisisthesecondwatch_myfatherboughtforme.,修饰人时关系代词that和who,whom的区分。当主句中的主语是who时，只能用that。eg.Whoisthegirlthatisstandingoverthere?在非限制性定语从句中以及介词后面时只能用who或者whom。eg.Ihaveason,whoisreallylovelyandinteresting.Thereare40studentsintheclass,mostofwhomareboys.关系代词whose既能修饰人，也能修饰物，在定语从句中充当定语，修饰先行词。eg.SheisthegirlwhoseEnglishsoundsverybeautiful.Maryhasaverygooddog,whosehairturnsoutwhiteandblack.,Correctmistakesforthefollowingsentences.1.Underthebigtreeare34students,manyofthemcomefromclasstwo.2.Mymotherhasagoodbook,whichcoverlooksterrible.3.Whoaretheyounggirlswhoarehavingdinnerintherestaurant?4.Sheisoneofthegirlswhoisveryinterestedinmaths.5.Tomistheonlyoneoftheboyswholikeplayingfootball.6.Whoisthegirlthatyoutalkedtoherjustnow?7.Thisistheverypenthatyougaveittomebefore.8.Thereisanoldwoman,thatisholdingastick.,whom,whose,that,are,likes,去掉her,去掉it,who,关系代词as的用法及其与which的区别。关系代词as在定语从句中指代整件事，充当句中的主语或者宾语，它经常和thesame,such,as一起搭配使用，共同构成一个固定词组。eg.Asweallknow,heisafamousscientist.Heisadiligentboy,asisexpected.Shehasthesamebookasyouhave.关系代词as可以放在句子的开头，可以使用被动语态，而关系代词which则不可以。请比较：Aseveryoneknows,itisnecessarytobuildahospitalinthissmalltown.Itisnecessarytobuildahospitalinthissmalltown,whichiscleartous.Ourdepartmentwillholdthemeeting,asisknownbyus.,关系副词when,where,why的用法以及与关系代词的区分。关系副词在定语从句当中只能充当状语，当一个句子能够完整地表达一个意思时，我们就可以给这个句子加上特定的关系副词。eg.IwontforgetthetimewhenIgotmarried.Haveyoustillrememberthedayswhenwestayedtogether?Thisistheplacewherewehadagoodtime.IsthisthehousewhereMrSmithlives?Idontknowthereasonwhyhewontjoinus.Doyouknowthereasonwhyhedidntcometosweeptheclassroom?,关系副词when,where和关系代词that,which的区分。同样是修饰一个地点，有时使用where，有时使用that/which；同样是修饰一个时间，有时使用when，有时使用that/which。这主要看两点：一是定语从句是否完整；二是定语从句中的谓语动词是否是一个及物动词。请比较以下句子：Thisistheparkthatwevisitedlastyear.Thisistheparkwhereweheldabirthdayparty.Shewontforgetthedaysthatshespentontheisland.Shewontforgetthedayswhentheystayedtogether.Thatsthedatewhenwewenttothecollege.Thatsthedatethatshewontforgetforever.Ilikethetimewhenwelivedtogether.Ilikethetimethatwehadtogether.,Exercises:Fillintheblankswithappropriaterelativepronounsandadverbs.1.Isthistheroom_youcleanedlasttime?2.Isthistheroom_welivedbefore?3.Thisisthegarden_theystayedforanight.4.Thisisthegarden_theyvisitedlasttime.5.Tomhasforgottentheday_helefthishome.6.Tomhasforgottentheday_Itoldhimlastday.7.Shestillrememberstheyear_shefoundherfirstjob.8.Shestillrememberstheyear_shespentinJining.,that,where,where,that,when,that,when,that,关系副词when,where,why和介词+which之间的关系。关系副词when,where,why可以用适当的介词+which来替代。如：when=in/on/at+which,where=in/on/at+which,why=for+which介词的位置非常灵活，有时放在关系代词之前，有时放在动词之后。eg.1.Iwontforgetthedatewhen(onwhich)Iwasborn.2.Thisistheroomwhere(inwhich)Ilived.=ThisistheroomwhichIlivedin.3.Idontknowthereasonwhy(forwhich)hehaventcometoday.4.Tomstillremembersthedayswhen(inwhich)theylivedinTianjin.,Comprehensiveexercises.Fillintheblankswiththesuitablerelativepronounsortherelativeadverbs.1.Isthistheroom_wespentourchildhood?2.Thisdictionaryisthesecondone_Iboughtintheshop.3.Istillrememberthedate_IwenttoNanjingforthefirsttime.4.Tomisthinkingaboutthegrassandthepersons_hesawintheyard.5.Thereare100oldmeni