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1、Discoveringusefulstructures同位语从句同位语从句theAppositiveclause(1)同位语从句的定义在复合句中用作同位语的从句称为同位语从句。同位语从句是名词性从句的一种。它在句中起同位语的作用。它一般放在fact,news,idea,truth,hope,problem,decision,belief,thought,doubt,promise,question等名词的后面,对前面的名词作进一步的解释,说明前面名词的具体内容和含义。引导同位语从句的词有连词that,连接副词how,when,wh
2、ere,whether,what等。e.g.Theproblemwhetherweshouldcontinuetodotheexperimenthasbeensolved.Ihavenoideawhenhewillcomeback.同位语从句有时被别的词把它和名词隔开：注意:ThestorygoesthatWilliamTellkilledthekingwithanarrow.Wordcamethattheirteamhadwon.⑵同位语从句的表现形式:①由that引导Thefactthatyouhaven’tenoughtim
3、etodotheworkisunbelievable.ThenewsthathehasbeenelectedpresidentoftheUnitedStatesistrue.Thetruththatheavyobjectsandlightobjectsfallatthesamespeedisknowntoall.②由whether引导Thequestionwhetherweneedmoretimetodotheworkhasnotbeendiscussed.③由when引导Ihavenoideawhentheywillgo.⑶有时
4、可用thatistosay(也就是说),inotherwords(换句话说),thatis(那就是),forexample等引出同位语,说明其前面的名词或代词。有时同位语直接跟在名词或代词的后面。ThereisonlyonewayofimprovingyourEnglish,thatis,topracticemore.AltogetherDollyhadlivedforsixyears,halfthelengthofthelifeoftheoriginalsheep.⑷同位语从句与定语从句的区别:①同位语从句说明的名词大都是抽象名
5、词,对其起到补充说明具体内容的作用;定语从句所修饰、限定的名词或代词有抽象的也有不抽象的，对其起修饰限定的作用。②同位语从句主要由连接词that引导,有时也可用when,where,who,whether等引导;定语从句由关系代词或关系副词引导。Thenheraisedthequestionwheretheyweretogetthemachineneeded.Doyouknowtheplacewherehewasborn?③引导同位语从句的连词不可省略;引导定语从句的关系代词作宾语时常可省略。Thenewsthathehasbee
6、nelectedmonitorofourclassistrue.Thenews(that)hetoldmeisexciting.区别下列句子哪些是同位语从句,哪些是定语从句。1.ThefactthatGreatBritainismadeupofthreepartsisknowntomany.2.Thenewsthatisspreadingaroundtheairportisthataheavystormiscoming.3.Thesuggestionthatstudentsshouldlearnsomethingpractical
7、isworthconsidering.同位语从句定语从句同位语从句4.Thestatethatconsistsofthreecountriesisdevelopingveryfast.5.Thesuggestionthattheyareconsideringisthatstudentsshouldlearnsomethingpractical.6.Thenewsthattheplanewouldtakeoffontimemadeeverybodyhappy.同位语从句定语从句定语从句练习1.Twofifthsofallgirlsi
8、nAmericaareonadiet./Thefactworriestheirparentsandteachersalot.ThefactthattwofifthsofallgirlsinAmericaareonadietworriestheirp
