UNIT5DISCOVERUSEFULSTRUCTURES主語從句課件高中英語人教版選擇性必修第一冊

新人教版選修一Unit5DiscoverUsefulStructuresSubjectclauses主語從句定義主語從句連接詞主語從句注意事項鞏固練習(xí)Contents1234主語從句定義Part1主語從句定義1.找出下列句子的主語。1.Jimisgoodatplayingthepiano.2.Toseeistobelieve.3.Smokingisbadforhealth.4.Whathehassaidistrue.在主從復(fù)合句中充當主語的從句就是主語從句,它是名詞性從句的一種。2.課文原句回顧。1.However,

concernedhimmostwas

farmersoftenhadpoorharvestsandsometimesevenhadaseriousshortageoffoodtoeat.2.

thiscouldbedonewasachallengingquestionatthetime.3.However,

itwaspossibletodevelopahybridofself-pollinatingplantssuchasricewasamatterofgreatdebate.4.Today,

isestimated

about60percentofdomesticrice...5.

impressespeoplemostaboutYuanLongpingishisongoingabilitytofulfilhisdreams.whatthatHowwhetheritthatWhat主語從句連接詞Part2主語的連接詞1.從屬連詞:that,whether/ifThathewillcomeiscertain.Whetherhewillcomeisuncertain.that只起連接作用，本身無意義，不充當任何成分，但不能省略。whether/if意為是否，只起連接作用，不作成分。2.連接代詞：what,who,whom,whose,which,whatever,whoever,whichever等。它們在主語從句中既起連接作用又在從句中充當主語、賓語、或表語。Whowillgomakesnodifference.Whatweneedismoretime.WhichbookIshallchoosehasn'tbeendecided.Whoeverbreaksthelawwillbepunished.WhateverIhaveisyours.3.連接副詞:when,where,how,why.在從句中作狀語。Whenwewillleavehasn'tbeendecided.Howshekeepshealthyisasecret.Whyhecriesisnotclear.Wherethemeetingwillbeheldisnotknown.主語從句學(xué)法指導(dǎo)依據(jù)“缺什么補什么”原則確定正確的連詞。所謂“缺什么補什么”是指從句與連詞之間的關(guān)系。如果句子中缺主語，指人用who，指物用what。如缺賓語，指人用whom，指物用what。如缺時間狀語用when；地點狀語用where。

原因狀語用why；方式狀語用how。如缺定語用whose或which。如什么都不缺用that，whether表“是否”。主語從句注意事項Part31.主語從句一般放在句首,但有時為了使句子結(jié)構(gòu)平衡,避免“頭重腳輕”,常用it作形式主語,而把從句放在后面。1.Thattheearthmovesaroundthesuniswellknown.

Itiswellknownthattheearthmovesaroundthesun.2.Thatshehasmadesuchamistakeisapity.

Itisapitythatshehasmadesuchamistake.3.Whetherhe'llcomehereisn'tclear.

Itisn'tclearwhether/ifhe'llcomehere.注意：主語從句位于句首時,不能用if

引導(dǎo),主語從句后置時,才可以用if引導(dǎo)。It作形式主語的常見句型:(1)It+be+形容詞（obvious,true,surprising,wonderful,possible,likely,certain)+that從句(2)It+be+過去分詞(said,reported,thought,expected,decided,announced,suggested等)+that從句(3)It+be+名詞詞組(apity,ashame,goodnews,anhonor,nowonder等)+that從句(4)It+動詞/動詞短語(seem,appear,happen,matter,turnout,occurto等)+that從句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從句（should）do翻譯下列句子:接虛擬語氣的主語從句:2.主語從句語序Whenwillhecomeisnotknown.Whenhewillcomeisnotknown.√×主語從句一律用陳述語序，即主語在前，謂語在后。例如：Whethertheywouldsupportuswasaproblem.Whatshesaidistrue.Wheresheisfromisunknown.Whentheywillstartisnotknownyet.3.主語從句的主謂一致問題1.Thathewillpasstheexamiscertain.2.WhichbookIshallchoosehasn'tbeendecided.3.Howshekeepshealthyisasecret.4.Whentheywillstartandwheretheywillgo_____(be)stillunknown.are當單個主語從句充當句子主語時，謂語動詞用單數(shù)；當兩個或兩個以上的主語從句充當主語時，謂語動詞用復(fù)數(shù)。4.what與that在引導(dǎo)主語從句時的區(qū)別1._______yousaidyesterdayisright.2._______sheisstillaliveisexciting.3._______helostthebikeworriedhimalot.4._______helostyesterdayishisbike.WhatThatWhatThatwhat既引導(dǎo)從句，又在從句中充當主語、賓語或表語，而that只引導(dǎo)從句，不在從句中充當成分。鞏固練習(xí)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._______________________________________________(為什么恐龍突然消失)stillremainsamystery.2._____________________________________________________(你和同學(xué)相處是否融洽)willaffectyoumood.3.Thetravelerlosthiswayinthewoods,and(令事情更糟糕的是天快黑了)______________________________________________________________.4.________________________(很奇怪)themanshouldhavestucktohissillyideas.Whydinosaurssudde