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1、第一类：名词作同位语限制性同位语含义：限制性同位语和前面的词关系比较密切ThebookwaswrittenbytheRussiannovelistTurgenev.Wedoctorsshouldberesponsibleforthepatients.第一类：名词作同位语非限制性同位语含义：非限制性同位语与前面的词关系比较松散，之间常有逗号隔开（表示略有停顿）Theycompletedtheprojectinsixmonths,halftheusualtime.QinghaiLake,thelargestinlandsaltlakeinChina,
2、lies3,198metersabovesealevel.第二类：代词和数词作同位语Let’stossfortheprize,aswebothgainedthesamepoints.Weallhaveourweaknesses.Theyeachexcelintheirrespectivefields.AnexampleisJacky,now66,whohasbeenherefor40years.Some485millionpeople,abouttwo-fifthsofourpopulation,liveinthisimmensearea.第三类
3、：形容词作同位语含义：作用接近于定语，放于所饰词的后面，且有逗号分开。People,oldandyoung,cameouttogreetthedistinguishedvisitors.*有时同位语提到句首Middle-aged,tallandthin,helookslikeatypicalShanxifarmer.Selflessandanxioustohelpothers,heledasimplelifeandworkedwithapplication.第四类：词组作同位语含义：作用接近定语Twophosphatemines,oneinHub
4、eiandtheotherinGuizhou,arebeingspeedilybuilt.Thesemethods,systematicallysummarized,arenowbeingpopularizedinthewholecountry.Lily,normallyatimidgirl,arguedheatedlywithboysaboutit.Alwaysaconscientiousworker,Billnowtookevenmoreinterestinthejob.同位语从句第一类：名词后跟that引导的同位语从句Didyougetth
5、emessagethatthemeetinghasbeenpostponed?ItisafactthatIhavewrittenthissentence.It’smyconsideredopinionthatheisaliarandacheat.HereferredtoCopernicus’statementthattheearthmovesroundthesun.HecametomeinthebeliefthatIcouldhelphim.Wemustacceptthepossibilitythatwemightbewrong.Igivemyg
6、uaranteethathewillbeheretomorrow.Icametotheconclusionthathe’dbeenlying.同位语从句第二类：名词和同位语从句分开TherumorspreadthatSueandDavidwerehavinganaffair.Thenewsgotaboutthathehadwonacarinthelottery.Reporthaditthattheroadwouldbeclosed.Theordersooncamethatallcitizensshouldevacuatethevillage.Th
7、ethoughtcametohimthatmaybetheyshouldbuythehouse.同位语从句第三类：用连接副词（代词）引起的从句作同位语Thereissomedoubt(asto)whethertheywillbesuccessful.
