人教版（2025）选择性必修第二册Unit 1 Science and Scientists Learning About Language课件（共15张PPT）（含音频+视频）.ppt

Unit1ScienceandScientistsPeriod3LearningAboutLanguage语法精析课表语从句【体验?悟】阅读下面课文原句,体会句中表语从句的用法。1.Onetheorywasthatbadaircausedthedisease.2.Anotherwasthatcholerawascausedbyaninfectionfromgermsinfoodorwater.3.ThetruthwasthatthewaterfromtheBroadStreetpumphadbeeninfectedbywaste.4.Itseemedthatthewomanlikedthewaterfromthepumpsomuchthatshehaditdeliveredtoherhouseeveryday.【生成?得】表语从句是在主从复合句中用作_____的从句。引导表语从句的词可以是____,它只起引导作用,本身无词义,且不能省略。表语that【研学?析】表语从句是用来说明主语的身份、性质、品性、特征和状态的,常位于系动词之后。引导表语从句的词有从属连词、连接代词和连接副词。1.由从属连词that,whether引导的表语从句。(1)that在引导表语从句时无词义,而whether有词义,意为“是否”。(2)主句的主语常常是一些抽象名词,如question(问题),trouble(麻烦),problem(问题),result(结果),chance(可能性),idea(想法),reason(理由)等。表语从句对主句主语进行说明、解释,使主语的内容具体化。(3)主句的主语如果是advice,suggestion,order,request,requirement等时,表语从句应用虚拟语气,即谓语动词用“(should+)动词原形”。①Thetroubleis________________________(她丢了钱).?②Thequestionis____________________________(我们是否还需要一些冰淇淋).?③Myadviceisthatyou______________________________(练习说英语)asoftenaspossible.?thatshehaslosthermoneywhetherweneedmoreicecream(should)practisespeakingEnglish2.由连接代词引导的表语从句。连接代词who,what,which,whom,whose等引导表语从句,在表语从句中作主语、宾语、表语,连接代词不能省略。①That’s_______________________(他在担心的事).?②WhatIwanttoknowis__________________________(谁带我们去车站).?③Thequestionis____________________________(我应该选哪一台电脑).?whatheisworryingaboutwhowillleadustothestationwhichcomputerIshouldchoose3.由连接副词引导的表语从句。连接副词where,when,how,why等引导表语从句,在表语从句中作状语,连接副词不能省略。①Goandgetyourcoat.It’s______youleftit.②Ihadneitheraraincoatnoranumbrella.That’s____Igotwetthrough.③Shehadabadcold.Thatis____shedidn’tattendschoolyesterday.wherewhywhy4.由从属连词because引导的表语从句。It/This/Thatisbecause...句型中从属连词because引导表语从句,意为“这就是为什么……/因为……”。“Thatisbecause...”与“Thatiswhy...”之间的不同在于“Thatisbec