高一语法 主语从句

主语从句在一个句子中做主语成分的从句叫主语从句。aHowthebookwillselldependsonitsauthor.bThatheisthebeststudentintheclassisobvious.主语从句常用it作形式主语放句首因而我们常见到这种句式：It+be+n./adj/-ed从句（that,whether,etc.)例:It'sapitythatyoushouldhavetoleave.ItisgreatthatIhaveateacherlikeyou.whether与if均为“是否”但下列情况下只用whether：1.whether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.从句后有ornotWhetheryoulikeitornot,you’llhavetodoit.连接词1.thatThattheearthmovesaroundthesuniswellknown.2.WhetherWhetherhewillcomeornotisnotknownyet.3.whoWhowillbesenttherehasnotbeendecided.4.WhatWhatyouneedismorepractice.5WhichWhichoneisthebestisnotclear.6When,whereWherehehasgoneisaquestion.7Why,howWhythereisgravityishardtounderstand.HowhecanearnalivinginBritainbecameabigproblem.8.whoever、whatever、whichever可引导主语从句。Whoevercomeswillbewelcome.Whateverhedidwasright.Whicheverofyoucomesinwillreceiveaprize.主语从句可以放在前面也可以放在后面。用it作形式主语,把主语从句放在句末。1)It+be+表语+主语从句Itisstilluncertainwhetherheiscomingornot.Itisstrangethattheydon’tknowthefilmstar.2)It+不及物动词+主语从句Ithappensthattheywereabsent.Itdoesn’tmatterwhetherhewillcomeornot.3)It+be+done+(不及物动词)+主语从句IthasbeendecidedthattheparkwillnotbeopenonMondays.注意事项1.主语从句位于句首时必须由连接词引导。2.主语从句位于句末时引导词that可省略。3.主语从句位于句首时,不能用if引导。4.主语从句位于句末时,可以用if引导。1.____makesthisshopdifferentisthatitoffersmorepersonalservices.AWhatBWhoCWhateverDWhoever2ThesewildflowersaresospecialIwoulddo____Icantosavethem.AwhateverBthatCwhichDwhichever3____intheregulationsthatyoushouldnottellpeoplethepassportofyoure-mailaccount.AWhatitrequiredBWhatrequiresCItisrequiredDItrequires1.Itisprettywellunderstood_____controlstheflowofcarbondioxideinandouttheatmospheretoday.（2003上海）A.thatB.whenC.whatD.how2._____madetheschoolproudwas____morethan90%ofthestudentshadbeenadmittedtokeyuniversities.（2003上海春）A.What;becauseB.What;thatC.That;whatD.That;because3.______hereferredtoinhisarticlewasunknowntothegeneralreader.（2007上海）A.ThatB.WhatC.WhetherD.Where4.parentssayanddohasalife-longeffectontheirchildren.（2007陕西）A.ThatB.WhichC.WhatD.As