英语xkw主语从句与表语从句

左：1.干旱2.迫使某人干某事3.取消（短语）4.车辆5.阻止…免受6.对…造成损失右：1.污染2.频繁地3.阻止；防止4.保护…免受5.松的；不牢固的6.热浪主语从句&表语从句Unit7NaturalDisasters主语从句

在复合句中，主语为句子的从句叫主语从句。主语从句用陈述语气，句首引导词不能省略。Thathedidn’ttakepartinmyweddingmade

me

unhappy.主语句子充当主语，这个句子就是主语从句引导词谓语宾语宾补从句用陈述句语气主语从句引导词有：从属连词that,whether,if

连接代词who,whoever,whom,what,whatever,whose,which

连接副词when,where,how,why...

Thathewillsucceediscertain.Whatweneedisyourhelp.Itisapitythatwelosttheball.识别主语从句1.先找谓语，谓语前的句子就是主语从句，2.it做形式主语，从句作真正的主语，即为主语从句主语从句that引导的主语从句

It

is

certain(that)hewillcome.为了使句子保持平衡，常用先行词it做形式主语，来代替主语从句，而把主语从句放于句末。不作成分，没有实际意义在句首时不能省略it作形式主语时that可省略Thathewillcomeis

certain.that在句首不能省略形式主语that在句末可省略句子为真正的主语，即为主语从句主语从句whether/if引导的主语从句

使用形式主语it时，whether引导的名词性从句为真正的主语。意为“是否”，不作成分不能省略，在句首只能用whether不用ifwhether与ornot连在一起时不用ifWhetherwe’llgocampingtomorrowdependsontheweather.Itdependsontheweatherwhetherwe’llgocampingtomorrow.Itdoesn’tmatterwhetherhewillcomeornot.Itdoesn’tmatterwhethrornothewillcome.在句首只能用whether不用if连接代词who/whom(谁)whose(谁的)what(什么)which(哪个)whoever(无论谁)whatever(任何)Whowillgomakesnodifference.谁去没有区别。Who作从句的_______主语Whatcausedthesandstormhasbeenmadecleartothepublic.你昨天说的是对的。What作从句的_______主语引起沙尘暴的原因已为公众所知。主语从句引导词连接代词在主语从句中充当主语成分，不能省略，有实际意义，语序为陈述语序，既有疑问含义又起连接作用。连接代词练习_____hesaidwashardtounderstand.A.WhatB.WhoeverC.ThatD.Which2.______breaksthetrafficruleswillgetafinefromthepolice.A.ThatB.WhetherC.IfD.Whoever3._____isthemostimportantinstudyisdiligenceratherthanintelligence.A.WhoseB.ThatC.WhatD.Whatever连接副词:when(何时)where(何处)why(为何)how(如何)Whenthemuseumwillopenhasn’tbeendecided.博物馆何时开放尚未决定。Whyshedidn’tcomeyesterdayisunknown.不知道她昨天为何没有来。Howthishappenedisnotcleartoanyone.它是如何发生的不为人知。起连接作用，不能省略，有实际意义，陈述语序，作状语。主语从句引导词连接副词练习_____thelibraryistobebuilthasnotbeendecidedyet.A.WhereB.WhateverC.ThatD.Which2.______westarttheworkisanimportantquestion.A.ThatB.WhenC.IfD.What3._____shewaslateforschoolisquiteclearnow.A.WhoseB.WhomC.WhyD.What4.____thishappenedisnotclear.A.WhichB.WhenC.HowD.Why主语从句后置为避免头重脚轻，常用it

作形式主语，从句作真正主语1.Itbe+形容词+that+主语从句Itisluckythatpeoplehavedecidedtomakeachange.幸运的是，人们已经决定作出改变。ItisobviousthattheblueskyandsunnydaysappearmoreofteninChengdu.很明显，蓝天和晴天在成都出现的次数比以前更多。It作形式主语的常见句型(1)Itis+n.+从句Itisapity/shamethat...遗憾的是……Itisasurprisethat...令人惊奇的是……Itisafactthat…事实是……Itiscommonknowledgethat………是常识(2)Itis+adj.+从句It’scertainthat………是肯定的Itispossiblethat...……是可能的Itisobviousthat………很明显Itisnecessary/important...that…

……是有必要的/重要的主语从句It作形式主语的常见句型(3)It+不及物动词+从句Itseemsasif…似乎……Itdoesn’tmatterthat………没关系(4)Itis+过去分词+从句Itisreportedthat…据报道……Itissaidthat…据说……Itisbelievedthat…人们相信……主语从句Predicativeclauses----表语从句表语从句定义什么是表语？Iamateacher.主系表Iambeautiful.主系表等同性描述形容性，描述特性表语是用来说明主语的身份、性质、品性、特征或者状态等什么是系动词？系动词是把表语和主语联系在一起的动词。分类be动词：am,is,are,was,were表感官：feel,look,smell,sound,taste表似乎：seem,appear表变化：get,become,turn,grow,make,come,go,fall,run表保持：remain,keep,stay,continue,stand,rest,lie,hold表语从句定义什么是表语从句？表语从句定义表语从句：在复合句中，充当表语成分的句子。Thefact

isthatwearenowfacingmoreandmorenaturaldisaster.主系表语从句引导词结构：主语+系动词+引导词+从句事实是我没有完成我的作业。ThefactisthatIdidn’tfinishmyhomework.补充that引导的表语从句，如果主语是建议、要求、命令等词，表语从句用“should+动词原形”（should可省略）。要求：request,requirement,insistence…建议：idea,advice,suggestion…命令：order,instruction…我的建议是我们应该告诉她。Mysuggestionisthatweshouldtellher.表语从句引导词要建命that不能省略不作成分没有实际意义通常不能省略表语从句whether引导的表语从句

意为“是否”，不作成分不能省略，Thequestioniswhetherthefilmisworthseeing.连接代词引导的表语从句

Theproblemiswhowecangettoreplaceher.Myconcerniswhathereallyexpectstogetfromus.WhatIwanttoknowiswhichroadweshouldtake.who/whom/whose/what/which...表语从句连接副词引导的表语从句

when/where/why/how...ThatwaswhenIwasnine.Theproblemishowwecanfindtheball.because引导的表语从句

Thisisbecauseshehasalreadyseenthefilm.表语从句练习1.Thereasonwhyhefailedis____hewastoocareless.

A.because B.thatC.forD.becauseof 2.Goandgetyourcoat.It’s________youleftit.

A.whereB.thereC.therewhereD.wherethere3.Thereasonis______Imissedthebus.

A.that B.whenC.whyD.what

4.WhatIwanttoknowis______helikesthegiftgivenbyus.

A.thatB.ifC.whether D.不填 主语从句和表语从句Itistruethatthesedisastersarenotactuallyallthatnatural.Itisknownthatsandstormsarecausednaturallybystrongwinds.Themostimportantthingishowwecanhavemorepeoplejoinus.由that引导的主语从句由that引导的主语从句由how引导的表语从句Task16Readandgroup.根据上面的例句对下列句子进行归类。1)Itissaidthatthefirstbridgewasbuiltmorethanthreecenturiesago.2)Thefactisthathecouldn’tusethecomputer.3)Thatiswhytheydecidedtoholdameeting.4)Itwon’tmaketoomuchdifferencewhetherwehaveitornot.5)Theproblemiswhichteamwillbechosen.6)Itdoesn’tmatterwhetheryoupaycashorbycreditcard.It’struethatthesedisastersaren’tactuallyallthatnatural.Themostimportantthingishowwecanhavemorepeoplejoinus.4）1）2）6）3）5）Task17Readandmatch.将左右两栏匹配，组成完整的句子。1)Wecutdowntoomanytreesandbadlypollutedtheenvironment.Thatiswhy2)Wehaveclearsignsandstrictrules.Thetroubleisthat3)Tomorrowwillbeverybusy.MysuggestionisthatA.lighttravelsinstraightlines.4)Lighttravelsfasterthansound.Andit’sknowntoallthat6)TheEarthisourhome.It’sluckythat5)Wecan’tfindher.WhereshehasgoneB.isnotknownyet.C.wehavemorenaturaldisasters.D.somepeopledonotfollowtherules.E.wegetupearlytomorrowmorning.F.moreandmorepeoplehavecometorealizetheimportanceofenvironmentalprotection.Task18Readandcomplete.阅读下面的句子，将括号内的词语重新排列补全对话。1)A:WhenwillMrBrownarrivetomorrow?B:

isstilluncertain.(MrBrown,whether,ornot,comi