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Unit1ScienceandScientists表语从句[观察例句]1．Onetheorywasthatbadaircausedthedisease.2．Thequestioniswhowillbethesuccessfulapplicantforthesummerjobatthelawfirm.3．HerconfusioniswhethersheshouldsticktoherownwayoflifeorfollowtheAmericanway.4．WhatJohnSnowwasdeterminedtofindoutwaswhythe1854outbreakofcholerainLondoncouldhavecausedover500deathswithintendays.5．Takingayearofffromschooltotravelabroadiswhatisgenerallycalledagapyear.[归纳用法]1．所有例句中的黑体部分都位于系动词be后，作表语，故都是表语从句，这些表语从句在词性上相当于一个名词。2．例1由从属连词that引导；例2由连接代词who引导；例3由从属连词whether引导；例4由连接副词why引导；例5由连接代词what引导。表语从句放在连系动词之后，充当复合句中的表语。表语从句就是指一个句子作为表语，说明主语是什么或者怎么样。一般结构为“主语＋系动词＋表语从句”。可接表语从句的连系动词有be，look，remain，seem等。1．从属连词that引导的表语从句从属连词that的用法：①无意义②不充当成分③不可省略Thereasonforhisabsenceisthathehasn'tbeeninformed.他缺席的原因是他没接到通知。Mysuggestionisthatweshouldtellhim.我的建议是我们应该告诉他。2．从属连词whether引导的表语从句Thepointiswhetherweshouldlendhimthemoney.关键在于我们是否应该借钱给他。[名师点津]if不能引导表语从句。3．连接代词和连接副词引导的表语从句Theproblemiswhoisreallyfitforthehardjob.问题是谁才真正适合做这份艰苦的工作。ThisiswhatIaminterestedin.这就是我所感兴趣的。That'swhereIfirstmether.那就是我第一次遇见她的地方。4．because，asif/though等引导的表语从句It'sjustbecausehedoesn'tknowher.这仅仅是因为他不认识她。NowitseemsasthoughshehadknownMillieforyears.现在好像她认识米莉已有好多年了似的。Itsoundsasifsomeoneisknockingatthedoor.听起来好像有人在敲门。[即学即练1]用where，when，that填空①Lookatthehighmountain.Thatiswherewewillget.②Thefirsttimewemeteachotherwaswhenwestudiedinthatschool.③Myadviceisthatwe(should)worktogether.5．why和because引导的表语从句的区别That'swhy...意为“那是……的原因”，强调结果That'sbecause...意为“那是因为……”，强调原因Ididn'tphoneher，andthat'swhyshegotangrywithme.(强调“没打电话”这一结果)我没有给她打电话。那就是她对我生气的原因。Ididn'tphoneher，andthat'sbecauseIgotangrywithher.(强调“生气”这一原因)我没有给她打电话。那是因为我生她的气了。[名师点津]reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because。6．表语从句中的虚拟语气在表语从句中，表示间接的命令、要求、请求、建议、决定等，主句中的主语通常是：advice，suggestion，proposal，request，order，idea等，从句谓语形式是“should＋动词原形”(should可以省略)。Myadviceisthatyou(should)practisespeakingEnglishasoftenaspossible.我的建议是你应该尽可能经常地练习说英语。[即学即练2]用why，that，because填空①Itwasraininghard；thatwaswhyIcamelate.②Icamelate；thatwasbecauseitwasraininghard.③ThereasonwhyIcamelatewasthatitwasraininghard.Ⅰ.单句语法填空1．Hegotcaughtintheheavytraffic.Thatwaswhyhewaslate.2．Energyiswhatmakesthingswork.3．Wedidn'tsetout；itwasbecausewewantedtowaituntilourmothercameback.4．Themostpleasantthingoftherainyseasonisthatonecanbeentirelyfreefromdust.5．Ashipinharborissafe，butthat'snotwhatshipsarebuiltfor.6．ThetroubleisthatIcan'tfindmyway.7．Whathewantstoknowiswhetherwecanfinishourworkbytomorrowmorning.8．ThereasonwhyIwassadwasthathedidn'tunderstandme.9．Thatiswhatwearelookingforwardto.10．Donotletanyfailuresdiscourageyou，foryoucannevertellhowcloseyoumaybetovictory.Ⅱ.完成句子1．简再也不是十年前的那个样子了。Janeisnolongerwhatshewastenyearsago.2．我获悉了你对英语校报的改革方案，那就是为什么我写信发表我自己观点的原因。IreadaboutyourreformoftheschoolEnglishnewspaper，andthat'swhyI'mwritingtovoicemyopinion．3．问题是他们是否能帮我们。Thequestioniswhethertheywillbeabletohelpus．4．那是因为他没有理解我。Thatwasbecausehedidn'tunderstandme．5．事实就是我们队已经赢得了比赛。Thefactisthatourteamhaswonthegame．