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Nounclausesasthesubject什么是主语？主语：是一个句子说明的人或事物,即叙述的主题，一般位于______。句首IlikeEnglish.Thetrainleft.Jimisgoodatplayingthepiano.Toseeistobelieve.Smokingisbadforhealth.Whathehassaidistrue.找出主语(名词）（不定式）（动名词）(从句）主语从句(SubjectClause)在主从复合句中充当主语的从句就是主语从句,它是名词性从句之一。引导主语从句的连接词有：从属连词that,whether；连接代词who,what和which；连接副词when,where,how和why。考纲专题解读•1.了解名词性从句的基本用法，掌握名词性从句的引导词及引导词在名词性从句中的作用，辨析that与what,if与whether等引导词的用法。•2.明确it作形式主语和形式宾语、代替主语从句及宾语从句的用法，及其与强调句的区别。•3.区分that引导的同位语从句及定语从句。他通过了考试让老师很高兴。Hepassedtheexam.Itmadetheteacherhappy.Hepassedtheexammadetheteacherhappy.Thathepassedtheexammadetheteacherhappy.理解主语从句他何时要来还不清楚。Whenwillhecome?Itisnotclear.Whenwillhecomeisnotclear.Whenhewillcomeisnotclear.理解主语从句Thathewillsucceediscertain.Whetherhewillcomemakesnodifference.Whatweneedismoretime.找出主语从句•Thathewillcomeiscertain.•Whetherhewillcomeisuncertain.引导词1)从属连词that和whether：_____只起引导作用，本身无意义，不充当任何分，但不能省略。whether不做成分，表“_______”。在主语从句中只能用_________,不能用___that是否whetherif•Whowillgomakesnodifference.•Whatweneedismoretime.•WhichbookIshallchoosehasn’tbeendecided.2)连接代词who,what,which引导词•Whoevercomesiswelcome.•WhateverIhaveisyours.•Whicheveryouwantisyours.3)连接代词whoever,whatever,whichever引导词whatever=anythingthatwhoever=anyonewho•Whenwewillleavehasn’tbeendecided.•Howshekeepshealthyisasecret.•Whyhecriesisnotclear.•Wherethemeetingwillbeheldisnotknown.4)连接副词when,where,how,why引导词1.引导词：从属连词that,whether；连接代词who,what,which；whoever,whatever,whichever;连接副词when,where,how和why。2.语序：陈述句语序3.在主语从句中只能用whether,不能用if•主语从句的特点：Itiscertainthathewillwinthematch.Thathewillwinthematchiscertain.注解：一般来说主语从句都是放在,但有时为了使句子，避免头重脚轻,常用作，从而把主语从句放在．句首保持平衡it形式主语后面这样就构成了下面一些常用句型:1)Itis+n.+thatItisapity/shamethat...可惜的是……Itisasurprisethat…令人吃惊的是…Itisafactthat…事实是…Itiscommonknowledgethat……是常识*_______________(很可惜)welostthematch.*______________(这是事实)hecheatedintheexam.ItisapitythatItisafactthat1.令人吃惊的是他改变了主意。Itisasurprisethathechangedhismind.2.真可惜你错过了这么一个好机会。Itisapitythatyoumissedsuchagoodchance.3.事实是我们周围的污染正变得越来越严重。Itisafactthatthepollutionaroundusisbecomingmoreandmoreserious.2)Itis+adj.+thatIt’scertainthat…肯定…Itispossible/likelythat...很可能……Itisobvious/clearthat…很明显…Itistruethat…的确…Itisnecessary\important\natural\...that…*_______________(很可能)shewillcomebacktomorrow.*_______________(很明显)heisanEnglish.+(should)+do…ItispossiblethatItisobviousthat1.很可能他会申请这项工作的。Itislikelythathewillapplyforthejob.2.的确我犯了个错误。ItistruethatImadeamistake.3.有必要我们要学习英语。ItisnecessarythatweshouldlearnEnglish.3)It+不及物动词+thatIthappenedthat...碰巧……Ithit/struck/occurredtomethat…我突然想起…Itappears/seemsthat…似乎，好像…Itturnedoutthat…原来…*________________(刚好)Iwasoutyesterday.*____________________(我突然想起)Iforgottosendtheletter.IthappenedthatItoccurredtomethat1.好像是我错了。ItappearsthatIamwrong.2.碰巧他得去参加一个会议。Ithappenedthathehadtoattendameeting.3.我突然想起他会说英语。ItoccurstomethathecanspeakEnglish.4.原来他是Mary的朋友。ItturnedoutthathewasMary’sfriend.4)It+be+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……Itisbelievedthat...据相信……;人们相信……Itissuggestedthat+(should）do...建议……*_________________(据报道)20peoplewerekilledintheaccident.*__________________(建议)weshouldeatmorevegetableanddomoreexercise.ItisreportedthatItissuggestedthat1.据说他已经去了上海。It’ssaidthathehasgonetoShanghai.2.众所周知台湾是中国的一部分.ItisknowntoallthatTaiwanispartofChina.3.有人建议我们应该多做运动。Itissuggestedthatweshouldtakemoreexercise.例1.Whenwillhecomeisnotknown.规律一、主语从句一律用陈述语序，即主语在前，谓语在后。正：Whenhewillcomeisnotknown.例2.Hewillnotcometothemeetingthiseveningistrue.正：Thathewillnotcometothemeetingthiseveningistrue.规律二、连词that在从句中无实际意义，但不能省略。例3.Ifthemeetingwillbeputoffhasnotbeendecidedyet.正：Whetherthemeetingwillbeputoffhasnotbeendecidedyet.规律三、whether可以引导主语从句，放在句首，但if不能例4.Whenhewillcomeareapuzzle.正：Whenhewillcomeisapuzzle.规律四、主语从句的谓语动词多用单数第三人称形式。Whenthemeetingwillbegin_____(have)notbeendecidedyet.hasWhentheywillstartandwheretheywillgo_____(be)stillunknown.Whenandwherethemeetingwillbegin_____(have)notbeendecidedyet.arehas例51.Whatheneeds___thatbook.2.Whatheneeds____somebooks.规律五、what引导的主语从句，可根据表语决定主句动词的单复数形式。isare他是不是我的孩子仍然是个问题。Whetherheismychildremainsaquestion.WhatIlikemostisyourhairstyle.我最喜欢的是你的发型。WhatIneedisrest.我需要的就是休息。HowDuLalabecomessuccessfuldependsonherhardwork.杜拉拉如何成功取决于她的勤奋。Itiscommonknowledgethatweshouldwearrainshoesonrainydays.雨天要穿雨鞋（rainshoes）是常识。2._______theycansolvethequestionisstillunknown.A.IfB.WhichC.WhetherD.What3._____hesaidatthemeetingastonishedeverybody.A.WhyB.WhatC.ThatD.Who4.____isafactthatEnglishisacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.It1._____weneedmorepracticeisquiteobvious.A.WhatB.ThatC.WhenD./Correctornot?*Whenthemeetingwillbeheldhaven’tbeenknownyet.…………………………….beheldhasn’tbeenknownyet.×Payattention:主语从句的谓语用单数形式10thecatdomadeWhatthecatdidmadethebabycry.WhatcryMakeasentence301.Thequestionis________thefilmisworthseeing.2.________weshallattendthemeetinghasn'tbeendecidedyet.用whether\if填空whetherWhether10Translatethesentence*_______________________________(他们很需要帮助)isquiteclear.Thattheyarebadlyinneedofhelp20talkabouttheuseofcellphoneWhattheyaretalkingaboutist