Unit 5 A delicate world Using Language 教学设计-高中英语外研版（2019）选择性必修第二册

Unit5SectionBUsingLanguage教学设计科目：英语课题：SectionBUsingLanguage课时：1课时教学目标与核心素养：1.掌握本课时的重点单词dissolve、nutrient、worm和短语benativeto、dueto、relyon、feedon、preyon、breakdown、takein、beinexistence、dependon、beresponsiblefor、contributeto的用法，并能在真实语境中灵活运用。2.掌握it作形式宾语的用法。3.引导学生关注话题的语用功能，学会表达质疑和回应别人的质疑。4.了解食物链中生物的相互制约、相互依存，共生共荣及生态平衡的重要性。人类可以通过自己的努力保护各个生态系统，促进生态平衡；人类也能够为了自身的眼前利益掠夺资源，破坏生态平衡。人类不能超自然而存在，保护生态平衡也是保护人类自己，一旦生态平衡遭到破坏，危及整个生物圈，人类自身也在劫难逃。教学重难点重点：it作形式宾语的用法。难点：1.it作形式宾语的用法。2.食物链使所有的生物保持着“一物治一物”的状态，只要没有外界的破坏，食物链就永远不会断，生态因食物链的存在而得到平衡。课前准备：多媒体，黑板，粉笔教学过程：一、Pre-class1.Greeting学生活动：完成活动1。Lookatthesentencesandanswerthequestions.Sentence(a)and(c)arefromthereadingpassage.aNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.•Whatdoes"it"refertoinsentences(a)and(c)?•Whatisthedifferencebetweenthesentencesineachgroup?Suggestedanswers:•"It"insentence(a)refersto“theislandisaUNESCOWorldHeritageSite"."It"insentence(c)refersto"tocomeupwithaplantoremovealltherabbitsfromtheisland".•Whentheobjectofasentenceisathat-clause(b)oraninfinitive(d),wesometimesuse"it"asanemptyobjectandputtherealobjectlatertokeepbalance.Forexample,sentence(a)uses"it"astheemptyobjectof“think",referringtotherealobject:"theislandisaUNESCOWorldHeritageSite".Sentence(b)usesthat-clauseastheobjectof"think".While-classit作形式宾语当动词不定式（短语）、v-ing(短语）或从句作宾语时，为了保持句子结构的平衡，常用it作形式宾语，而将真正的宾语后置。此时的it无词义。其用法如下：（1）常以it作形式宾语的动词有：feel,consider,find,believe,make,take,imagine,prove,think,suppose,regard,notice等。DfinditeasytogetonwithJim.我发现同吉姆相处很容易。（2）it作形式宾语，代替动词不定式（短语）TheyfounditpleasanttoworkwithusChinese.他们发现与我们中国人一起工作很愉快。Hemakesitarulenevertoborrowmoneyfromothers.他立志决不向别人借钱。Iconsideritadvisabletotellherbeforehand.我认为还是事先告诉她好。（3）it作形式宾语，代替v-ing(短语）用v-ing(短语）作真正的宾语时，其宾补通常是nouse,nogood,awaste,hardwork等。IthinkitnogoodspendingtoomuchtimewatchingTV.我认为花太多时间看电视是没有好处的。Ifeelithardworkpersuadinghimintodoingit.我感觉说服他做那件事很难。（4）it作形式宾语，代替从句①在一些习惯用法中,it在hate,like,love,appreciate,enjoy,take,have等动词后作形式宾语，代替其后的宾语从句。DIhateitwhenhetalkswithhismouthfull.我讨厌他一边吃一边说话。Ilikeitwhenabookissogoodthatyoucannotputitdown.我喜欢那种碰上好书时手不释卷的感觉。②在一些特殊结构中，用it作形式宾语。takeitforgrantedthat...认为......是理所当然seetoitthat...确保......oweitto...that...多亏....../幸亏......WealltakeitforgrantedthatJameswillwinthegame.我们都确信詹姆斯将赢得这场比赛。Wouldyouseetoitthatshegetshomeearly?你保证她早早到家，好吗？IoweittomyteacherthatImadesuchrapidprogress.多亏了我的老师，我才取得这么快的进步。三、After-class学生活动：学生完成活动3。LookatthepicturesoftheSaihanbaNationalForestParkanddescribeitschangesusingitasanemptyobjectwhereappropriate.Youmayrefertothewordsandexpressionsinthetableforhelp.Ithinkitabreakthroughtotransformadesertintoaforest...Suggestedanswers:Ithinkitabreakthroughtotransformadesertintoaforest.Ithinkitlikelytoplanttreesinthedesert.Ithinkitimpossiblethatcropscouldbegrowninthisareabefore.Ithinkitunrealisticto