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时间:2018-12-15
《高二英语《unit 21 human biology the second period grammar(ⅰ)》教案》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、安徽省滁州二中高二英语《Unit21HumanBiologyTheSecondPeriodGrammar(Ⅰ)》教案StepⅠRevisionandlead-inT:Attheendoflastperiod,Iaskedyoutofindoutallthesentencesinitalicsinthearticle—SuperAthletes.Haveyoufinishedcollectingthesesentencesinitalics?Howmanysentencesinitalicsarethereinthisarticle?Ss:T
2、herearesevensentencesinitalicsinthisarticle.T:Right.Thenwhowouldliketopresentthesesentences?S:Iwouldliketodoit.ManycontemporaryamateurathleteswouldhavebrokenworldrecordsiftheyhadtakenpartinthefirstOlympicGames.Ifrecordsfall,itisusuallyduetobetterequipment,traininganddiet.B
3、enJohnsonwouldstillbethe100metresworldholderifhehadnotbeencaughttakingdrugsinthe1988Olympics.IfcurrentOlympicchampion,MarionJones,tooksuchdrugs,shewouldprobablyhavebrokenthatworldrecordmorethanonce.Unlesswearecareful,“gene-therapy”willbethenextbigthreat.Ifgene-therapywereu
4、sednow,itwouldbealmostimpossibletofindout.Ifagenerationofsportsstarswithenhancedgeneswerecreated,itwouldcontradictthewholespiritofsport.T:Great.Youhavedoneagoodjob.Inthisperiod,studentsareexpectedtoreviewsomeconditionalsentencestheyhavelearnedbefore,andthentheywilllearndif
5、ferentusageoftherealandunrealconditionals.Ifstudentswanttoknowmoreabouttheusage,theycanreadthedetailedexplanationthatareincludedintheappendix(附件).Teachersmaydistributethemtostudentsforreference.StepⅡTheconditionalsentencesShowthestudentsthesentencestheypresentaboveonthescr
6、eenandhavethemfindoutthedifferencesamongthem.Itaimstohelpthemtotellthedifferencesamongthem.T:Lookatthesefoursentences,whattimedoeseachcondition(underlined)inthesentencereferto:past,presentorfuture?Whattenseisused?Let’scompletethetablebelow.ConditionTimereferenceVerbform1th
7、epresentpastsimple2thepresentpastsimple3thepasthad+pastparticiple4thepasthad+pastparticipleT:Whattimedoestheresultinthesentencesreferto:pastorpresent?Whatverbformisused?ResultTimereferenceVerbform1thepastwould+perfectinfinitive2thepastwould+perfectinfinitive3thepresentwoul
8、d+verb4thepresentwould+verbTask3ExplanationT:Thisisastructureusedtotalkaboutunreal,imagin
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