主语从句-重点

NounclausesasthesubjectUnit4Grammar1.______watchwaslostisunknown.2.________youdidisright.3._________wewillgoforanoutingtomorrowremainsunknown.4.______weneedistime.5.______willbeourmonitorhasn'tbeendecidedyet.whetherwhatwhowhosewhateverUsethewordsbelowtofillintheblanks.WhetherWhatWhateverWhoseWho上面的空大家都填对了吗?上面每个句子都出现了的主语从句，大家能找到吗？1.Whosewatchwaslostisunknown.2.Whateveryoudidisright.3.Whetherwewillgoforanoutingtomorrowremainsunknown.4.Whatweneedistime.5.Whowillbeourmonitorhasn'tbeendecidedyet.请把下列句子的谓语找出来1.Whosewatchwaslostisunknown.2.Whateveryoudidisright.3.Whetherwewillgoforanoutingtomorrowremainsunknown.4.Whatweneedistime.5.Whowillbeourmonitorhasn'tbeendecidedyet.请把下列句子的谓语找出来1.Whosewatchwaslostisunknown.2.Whateveryoudidisright.3.Whetherwewillgoforanoutingtomorrowremainsunknown.4.Whatweneedistime.5.Whowillbeourmonitorhasn'tbeendecidedyet.主语从句(SubjectClause)如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.Whatweneedaregooddoctors.Whomwemuststudyforisaquestionofgreatimportance.连接词1.thatThattheearthmovesaroundthesuniswellknown.2.whetherWhetherhewillcomeornotisnotknownyet.3.whoWhowillbesenttherehasnotbeendecided.4.whatWhatyouneedismorepractice.5.whichWhichoneisthebestisnotclear.6.when,whereWherehehasgoneisaquestion.7.why,howWhythereisgravityishardtounderstand.HowhecanearnalivinginBritainremainsabigproblem.8.whoever、whatever、whichever可引导主语从句。Whoevercomeswillbewelcome.Whateverhedidwasright.Whicheverofyoucomesinwillreceiveaprize.1.引导主语从句不能用if代替whether,但主语从句后置时，可用if引导2.连词位于句首不能省略，主语从句后置的时候，that可以省略。3.主语从句大多数情况下视为第三人称单数,但在关系代词what引导的主语从句后谓语动词的数要根据句意而定。小结Chooserightwordsforthesesentences.1.theywillsellthehouseisnotclearsofar.(Whether/If)注解：在句首引导的主语从句,不用来替换.2.①discoveredAmericaisknowntoall.②ColumbusdiscoveredAmericaisknowntoall.(What/Who/That)WhetherWhoThatwhetherif注解：在主语从句中无,不充当,但不能.实际意义句子成分省略that注意：1.Whetheryoucansucceeddependsonyourself.2.Whatweneed_____water.Whatweneed_____usefulbooks.(is/are)注解：主语为从句时，谓语动词一般要用单数形式；isare但如果what引导的从句作主语、代表复数概念（常可从表语上看出）时，谓语动词则常用复数形式。有时为了使句子结构平衡,避免“头重脚轻”,常用it作形式主语,而把从句放在后面。例如:Thatshehasmadesuchamistakeisapity.Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾。whether与if均为“是否”但下列情况下只用whether：1.引导主语从句并在句首Whetherhewillcomeisnotclear.2.引导表语从句Thequestioniswhetherhe’llcome.3.whether从句作介词宾语I’mnotsureaboutwhetherwe’llwin.4.后面有ornot的时候Whetheryoulikeitornot,you’llhavetodoit.1.他出生在何地还不知道。2.谁会赢得比赛还不知道。3.谁来都欢迎。4.那个人为什么被谋杀尚不知道。Wherehewasbornhasnotbeenfound.Whythepersonwasmurderedisstillunknown.Whowillwinthematchisstillunknown.Whoevercomesiswelcome.