UNIT5DISCOVERUSEFULSTRUCTURES主语从句课件高中英语人教版选择性必修第一册

新人教版选修一Unit5DiscoverUsefulStructuresSubjectclauses主语从句定义主语从句连接词主语从句注意事项巩固练习Contents1234主语从句定义Part1主语从句定义1.找出下列句子的主语。1.Jimisgoodatplayingthepiano.2.Toseeistobelieve.3.Smokingisbadforhealth.4.Whathehassaidistrue.在主从复合句中充当主语的从句就是主语从句,它是名词性从句的一种。2.课文原句回顾。1.However,

concernedhimmostwas

farmersoftenhadpoorharvestsandsometimesevenhadaseriousshortageoffoodtoeat.2.

thiscouldbedonewasachallengingquestionatthetime.3.However,

itwaspossibletodevelopahybridofself-pollinatingplantssuchasricewasamatterofgreatdebate.4.Today,

isestimated

about60percentofdomesticrice...5.

impressespeoplemostaboutYuanLongpingishisongoingabilitytofulfilhisdreams.whatthatHowwhetheritthatWhat主语从句连接词Part2主语的连接词1.从属连词:that,whether/ifThathewillcomeiscertain.Whetherhewillcomeisuncertain.that只起连接作用，本身无意义，不充当任何成分，但不能省略。whether/if意为是否，只起连接作用，不作成分。2.连接代词：what,who,whom,whose,which,whatever,whoever,whichever等。它们在主语从句中既起连接作用又在从句中充当主语、宾语、或表语。Whowillgomakesnodifference.Whatweneedismoretime.WhichbookIshallchoosehasn'tbeendecided.Whoeverbreaksthelawwillbepunished.WhateverIhaveisyours.3.连接副词:when,where,how,why.在从句中作状语。Whenwewillleavehasn'tbeendecided.Howshekeepshealthyisasecret.Whyhecriesisnotclear.Wherethemeetingwillbeheldisnotknown.主语从句学法指导依据“缺什么补什么”原则确定正确的连词。所谓“缺什么补什么”是指从句与连词之间的关系。如果句子中缺主语，指人用who，指物用what。如缺宾语，指人用whom，指物用what。如缺时间状语用when；地点状语用where。

原因状语用why；方式状语用how。如缺定语用whose或which。如什么都不缺用that，whether表“是否”。主语从句注意事项Part31.主语从句一般放在句首,但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。1.Thattheearthmovesaroundthesuniswellknown.

Itiswellknownthattheearthmovesaroundthesun.2.Thatshehasmadesuchamistakeisapity.

Itisapitythatshehasmadesuchamistake.3.Whetherhe'llcomehereisn'tclear.

Itisn'tclearwhether/ifhe'llcomehere.注意：主语从句位于句首时,不能用if

引导,主语从句后置时,才可以用if引导。It作形式主语的常见句型:(1)It+be+形容词（obvious,true,surprising,wonderful,possible,likely,certain)+that从句(2)It+be+过去分词(said,reported,thought,expected,decided,announced,suggested等)+that从句(3)It+be+名词词组(apity,ashame,goodnews,anhonor,nowonder等)+that从句(4)It+动词/动词短语(seem,appear,happen,matter,turnout,occurto等)+that从句1.Itisafactthathecheatedintheexam.2.Itseemsthatheisnothimselftoday.3.Itisnecessarythatwe(should)

havebreakfast.4.Itwassuggested

thatwe

(should)putoffthemeeting.◆Itisnecessary/important/essential/vital/crucial/strange/natural等+that（should）do◆Itissuggested/requested/desired/ordered/demanded等+that从句（should）do翻译下列句子:接虚拟语气的主语从句:2.主语从句语序Whenwillhecomeisnotknown.Whenhewillcomeisnotknown.√×主语从句一律用陈述语序，即主语在前，谓语在后。例如：Whethertheywouldsupportuswasaproblem.Whatshesaidistrue.Wheresheisfromisunknown.Whentheywillstartisnotknownyet.3.主语从句的主谓一致问题1.Thathewillpasstheexamiscertain.2.WhichbookIshallchoosehasn'tbeendecided.3.Howshekeepshealthyisasecret.4.Whentheywillstartandwheretheywillgo_____(be)stillunknown.are当单个主语从句充当句子主语时，谓语动词用单数；当两个或两个以上的主语从句充当主语时，谓语动词用复数。4.what与that在引导主语从句时的区别1._______yousaidyesterdayisright.2._______sheisstillaliveisexciting.3._______helostthebikeworriedhimalot.4._______helostyesterdayishisbike.WhatThatWhatThatwhat既引导从句，又在从句中充当主语、宾语或表语，而that只引导从句，不在从句中充当成分。巩固练习Part41.Matchthesentenceparts.（P53）1.

remainsanunansweredquestion.2.

isanimportanttopicforustoresearch.3.

isthatthesechemicalsmayevencausecancer.4.

thesevegetablescanevenbeplantedwithoutanysoilthroughthisnewtechnology.5.

isthereasonwhysomepeopleprefertoliveinthecountryratherthaninthecity.A.WhatworriesmanypeopleB.ThatthelifestyleisslowerandhealthierC.HowwecanfindasuitablesolutiontoproducesufficientfoodD.WhenthesewheatfarmerswilljointhispilotexperimentE.ItamazedallofusthatDCAEB1.________hewillsucceediscertain.2.________hewillgothereisstillamystery.3.________hesaidisnottrue.4.________willhappentotheworldisdifficulttopredict.5.___________wewillgocampingtomorrowdependsontheweather.6._______willtaketheplaceofouroriginalheadmasterhasn’tbeendecidedyet.7._______hegaveupthechanceofstudyingabroadisunknown.8.________wewillhavethepicnicnextweekisbeingdiscussed.9.____________________________hehidthemoneyistobefoundout.10.________willbechosenournewmonitorisstillunknown.11.Itisbynomeansclear_____thepresidentcandotoendthestrike.12.Itremainstobeseen__________thenewlyformedcommittee'spolicycanbeputintopractice.13._______youneedisagreatteacherwholetsyoumakemistakes.2.Filltheblankswiththerightwords.ThatWhetherWhatWhere/When/How/WhyWhowhetherwhatWhatWhatWhetherWhoWhyWhen/Where3.Completethesentences.1._______________________________________________(为什么恐龙突然消失)stillremainsamystery.2._____________________________________________________(你和同学相处是否融洽)willaffectyoumood.3.Thetravelerlosthiswayinthewoods,and(令事情更糟糕的是天快黑了)______________________________________________________________.4.________________________(很奇怪)themanshouldhavestucktohissillyideas.Whydinosaurssudde