新课标高一教学资源库16-17下-必修三课件learning about

UnitthescienceoftheLearningaboutLearningaboutlanguage-LearningaboutlanguageLearningaboutlanguage-Learningaboutlanguage-AnswerkeyforEx.21.C2.A3.C.AnswerkeyforEx.3 2.3.gavebirth 4.Asa5. 6.AnswerkeyforEx.4EmotionalCalmWhatpartdoestheunderlinedpartserveasineachsentence?Atreehasfallenacrosstheroad.Youareastudent.Tofindyourwaycanbeaproblem.Smokingisbadforyou.“Howdoyoudo?”isagreeting.Whatshesaidisnotyetknown.Thatweshallbelateiscertain.Itiscertainthatweshallbelate.Wecanseefromthesesentencesasentenceservesassubject,sowecallitSubjectClause.主语从（NounClausesasthe定义用作主语的从句叫主语从句连词that,whether；连接代词who,what和which；连接副词whenwhere,用法由whatWhattheteachersaidtodaywasquiteright.老师今天说的话是十分正确的由连词thatThattheyarebadlyinneedofhelpisquiteclear.他们急需帮助，这是十分明显Whethertheywillsellthehouseisnotyetdecided.他们是否卖掉这所房whateverwhoever也可引导主语从句。Whateverwassaidheremustbekept这里说的话都应当Whoevermakesmistakesmustcorrectthem.凡犯了错误的人都注意:上述例句中的主语从句都是放在句首但有时为了使句子结构平衡避免“头重脚轻”,it作形式主语,而把从句放在如:Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾这样就构成了下面一些常用句型Itisadj.n从Itisapity/shamethat..遗憾的是Itispossiblethat...很可能Itisunlikelythat...不可能It不及物动词+从Itseems/appears 似乎Ithappened 碰巧Itbe过去分词+从Itissaid 据说Itisknowntoall众所周知Itisreportedthat...据报道Itisbelieved据信……;人们相信Itissuggestedthat..有人建议Itmustbepointedout必须指出Ithasbeenprovedthat...已证明…….如Itisbelievedthatatleastascoreofbuildingsweredamagedordestroyed.据信至少有二十座楼房遭到破坏或彻.用于Itisimportant/natural/necessaryimpossiblethat...句型中,主语从句应使用虚拟语气,谓语动词用\“should动词原形\”的形式有时有感情It+及物动词（被动语态）+主语从IthasbeendecidedthattheexhibitionwillnotopenonSundays.注意导，不能省略这些连接词；但是如果用it误：Theyshouldlikeeachotheris正：Thattheyshouldlikeeachotheris正：Itisnaturalthattheyshouldlikeeachother.如果主语从句放在句首，不能用if引导，但是如果用it做形式主语，而把主误：IfMaryreallyheardhimisreally正：ItwasdoubtfulifMaryreallyheard

youdon’tlikehimisnoneof

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ourastronautsdesiretoiswalkin1.Ihavealwaysbeenhonestandanditdoesn‘tmatter thatI’mtalkingA.whois .whoitC.itis D.itis结构，其主句部分是itdoesn’tmatter主语从句则是whoitisthatI’mtalkingto.修饰who.Who既是一个引导词，也在it(talking)to的介词宾语也可以。Itisprettywellunderstood controlstheflowofcarbondioxideinandouttheatmospheretoday. B. . D.【试析】主语从句中缺少做主语的成分，故选 madetheschoolproudwas morethan90％ofthestudentshadbeenadmittedtokeyuniversities.What; What;C.That; D.That;【试析】what在此作连接代词句，并在从句中作主语。tha只起引导作用，不作任何成分.DiscoveringusefulstructuresAnswerkeyforEx.WhatmanyscientistsbelieveisSowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependon…AnswerkeyforEx.WhathasnotyetbeenprovedishisWhetherotherastronomersaccepthisideasremainsaquestion.Howlifefirstappearedonearthisstillamysterytoscientists.Whytheearthis ingwarmerisanimportanttopicforresearch.ItamazedeverybodythatStephenHawkingat65experiencedzerogravityduringaflight.ItisasurprisethatPlutoisnolongerconsideredap