主语从句讲解ppt课件.ppt

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1、SubjectClauses主语从句定义：用作主语的从句叫主语从句,它是名词性从句之一.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallow

2、edtheearthtodissolveharmfulgasesandacidintotheoceansandseas.表语主语宾语1)连接代词what(whatever),who(whoever),which(whichever),whom,whose.Whichsidewillwinisnotclear.Whowillwritethepoemhasnotbeendecidedyet.Whateverhedidisright.Whatthecitywillbestillremainsamystery.连接代词引导主语从句，在句中作主语，宾语，表语，定语。定语主语宾语

3、表语Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.从属连词：that，whether引导主语从句只起引导作用，在主语从句中不充

4、当任何成分，that本身无实际意义，但不能省略.whether意为“是否”，放在句首句末皆可。Thatpricewillgoupiscertain.Thathewillcomeiscertain.Whetherwegobytrainorbyboatmakesnodifference.Whetherhe’ll come hereisn’t clear.Whytheysuddenlydisappearedstillremainsamystery.3)连接副词when，where，how，why等,在从句中做状语。Howthis happened is not clear 

5、to anyone.Whenhewillbebackdependsontheweather.Whenwe’llstarttomorrowwillbetoldsoon.Wherethetestwillbegivenisnotyetdecided.总结：引导主语从句的连接词有：从属连词:that,whether；连接代词:who(whoever),whom,whose,what(whatever)和which(whichever)；连接副词:when,where,how和why。Makesentences:It’scertain.we’llbelate.Ishecomin

6、gornot？Wedon’tknowWhatdoeshewanttotellus?Wedon’tknowWhenwillyoucomeback?Itdoesn’tmatter.It’scertainthatwewillbelate.Thatwe’llbelateiscertain.Wedon’tknowwhetherheiscomingornot.Whetherheiscomingisnotknown.Wedon’tknowwhathewantstotellus.Whathewantstotellusisnotknown.Whenyouwillcomebackdoes

7、n’tmatter.Itdoesn’tmatterwhenyouwillcomeback.主语从句后置!为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.例:Thatweshallbelateiscertain.--It’scertainthatweshallbelate.1.Thattheearthisroundisknowntoall.--2.Thatyoumissedthechanceisapity.--Itisapitythatyoumissedthechance.It’sknowntoallthatthee