Unit2Period3Discoveringusefulstructures（课件）-高中英语新教材（人教版选择性）(共32张PPT)

人教版选择性必修二Period3DiscoveringusefulstructuresSubjectClausesUnit2BridgingCulturesTeachingGoals1.EnabletheSstomastertheusageofsubjectclausesinthisunit.2.EnabletheSstousethesubjectclausespatternsflexibly.3.TraintheSstoapplysomeskillsbydoingtherelevantexercises.自我探究；发现规律

{Jack'sstoryismoving.WhatJackdidismoving.

主语在句中充当主语的从句叫做主语从句。什么是主语从句？主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前；或由形式主语it代替，而本身放在句子末尾。1.WhatseemedstrangebeforenowappearsquitenormaltoXieLei.2.WhatsurprisedXieLeiwasthatshefoundherselfspeakingupinclassafterjustafewweeks.3.ItisimportantthatXieLeikeepsabalancebetweenherstudiesandhersociallife.5.Howthebookwillselldependsonitsauthor.6.Itisimportantthatweallshouldattendthemeeting.划出下列句子中的主语从句主语从句的连接词Thathewillwin

iscertain.Whetherhe’lljoinusinthediscussion

isofgreatimportance.1.从属连词：that：只起引导作用，本身无实际意义，不充当任何成分，但不能省略。whether：意为“是否”，不充当从句的任何成分。2.连接代词who,what,which,whoever,whatever,whichever引导主语从句，包含意思，并在从句中充当成分。1)_____yousaidyesterdayisright.2)_____sheisstillaliveisaconsolation（安慰）.3)_____helostthebikeworriedhimalot.4)_____causedtheaccidentremainsunknown.

5)_____mademattersworsewas____nightbegantofall.6)_____wecan’tgetseemsbetterthan______wehave.WhatThatThat注：what

与that在引导主语从句时的区别what在从句中充当句子成分，如主语、宾语、表语，而that则不然。

WhatWhatthatWhatwhatWherewewillholdthebasketballgametomorrowisnotimportant.Whenshewillbeback

isstillaquestion.Whyhecamehere

isnotknown.Howwecanprotectthegrainfromdamp

needstobediscussed.3.连接副词when,where,why,how等引导主语从句，包含意思，并在从句中充当成分，不可省略。为了避免句子头重脚轻，通常把形式主语it放在主语位置，真正主语置于句末。(1)it作形式主语，从属连词that引导的从句作真正的主语。①It＋be＋形容词(obvious，true，natural，surprising，good，wonderful，funny，possible，likely，certain，probable等)＋that从句。Itisn'tlikelythatIshouldacceptsuchanofferasthat.我不可能接受像那样的帮助。②It＋be＋名词词组(nowonder，anhonor，agoodthing，apity，nosurprise等)＋that从句。It'snowonderthathedidn'twanttogo.难怪他不想去。

用it作形式主语的结构it做形式主语跟踪练习重难点突破分析句子成分缺主宾表定缺状语用连接代词

用连接副词

根据语意缺什么补什么都不缺用that或whetherwho___whetherWhyThatwhat1._______makesdogsidentifypatientswithcancerisamystery.2._______hesucceededinapplyingforthepositionmadehisfamilyhappy.3.It’snotsure_________teamwillwinthematch.that、what、which区别that在从句中不作成分，只起连接作用，无意义；what在从句中作主宾表或定语，“what什么,或所…”which在从句中作主宾表或定语，which“哪一个”有选择范围。WhatThatwhich1.________breaksthelawwillbepunished.

_______________breaksthelaw,he/shewillbepunished.2.______isknowntousallisthatsomestudentscheatinexamsatschool.

______isknowntousallthatsomestudentscheatinexamsatschool.______isknowntousall,

somestudentscheatinexamsatschool.WhoeverNomatterwhoWhoeverWhatItAs对比训练1.Itisagoodideathat/anhonor/mypleasurethat…2.Itisnatural/strange/essential/important..thatsb.shoulddo…3.Itseems/appears/happenedthat…4.Itisreported/saidthat…据报道…Itisrequired/suggested

thatsb（should）do…用it作形式主语的句型:主谓一致1.Whenhewilldotheexperiment______(have)notbeendecidedyet.2.Whatwebadlyneed______enoughtimetosleep.3.Whattheboywants________somebooksofgreatbenefit.hasisare从句做主语谓语一般用单数

what从句根据它所指代的内容确认谓语单复数。1.______thedelayedflightwilltakeoffdependsmuchontheweather.2.It’suncertain_____sideeffectthemedicinewillbringabout,althoughabouttwothousandpatientshavetakeit.3._______wasmostimportanttoher,shetoldme,washerfamily.4.______LiBai,agreatChinesepoet,wasbornisknowntothepublic,butsomewon’tacceptit.WhenwhatWhatWherePractice改错1.Italldependsoniftheywilldotheirbest.

2.Isthatyoutoldtrue?3..Firstofall，weshouldpreventhimfromdoingitisthemostimportant.4.Weallthoughtitisapitywhichtheconcertwasputoff.whetherwhatthatthat－－－＾写作练习李华收到美国朋友Mike的来信，听说港珠澳大桥已全线通车，这是建筑史上一大奇观。想向李华了解具体详情。请你回信作个简要介绍。DearMikke,Ihaveheardfromyou.YouwouldliketolearnabouttheHongkong-Zhuhai-MacaoBridge.1.Hereissomerelevantinformationaboutit.Itstotallengthis49.97kilometers.ItstratedinDecember2009.2.It'stheworld'slongestsea-crossingbridge,whichamazestheworld.3.Atthebeginning,thepassagemoneyconcernedsomepeoplealot.4.Besides,peopledidn'tknowwhethertheprojectwouldaffectwhitedolphins.Thesehadattractedthechiefengineers'attention.Beforetheconstruction,manymeetingshadbeenheld.RewriteDearMikke,Ihaveheardfromyou.YouwouldliketolearnabouttheHongkong-Zhuhai-MacaoBridge.1.

Hereissomerelevantinformationaboutit.Itstotallengthis49.97kilometers.ItstratedinDecember2009.2.It'stheworld'slongestsea-crossingbridge,whichamazestheworld.3.Atthebeginning,thepassagemoneyconcernedsomepeoplealot.WhatIwanttotellyouhereThattheworld'sthelongestsea-crossingbridgeisopenedamazestheworld.Whatconcernedsomepeoplemostwasthepassagemoney.Whethertheprojectwouldaffectthewhitedolphinshadattractedthechiefengineers'attention.Howthebridgewouldbeconstructedhadbeendiscussedformanytimes.7.Theexpertspredictthelifespanofthebridgeissetat120years.

8.ItreducestraveltimefromHongkongtoMacauorZhuhaifromoverthreehourstojusthalfanhour.

9.Thebridgemakesitconvenientforpeopletotravel.

Thanksyouforyourcloseattention.