高中英语（人教大纲）第二册上：unit9 saving the earth(第五课时)

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1、TheFifthPeriodInversionTeachingAim:Learnandmastertheuseofinversion.TeachingImportantPoint:Helptilestudentstomakeasummaryofallkindsofinversion.TeachingDifficultPoint:Helpthestudentsknowinwhichcasesfullinversionisusedandinwhichcasespartialinversionisused.TeachingMethods:Revision;summary;exp

2、lanationandinductivemethods.TeachingAids:aprojectorandtheblackboardTeachingProcedures:StepGreetingsGreetthewholeclassasusual.StepIIRevisionandLead-inT:InUnit9,we'velearntsomesentencesininvertedword-order.Now,I'llshowyousomesentencesonthescreen.Pleasetellwhichareinnaturalornormalword-order

3、andwhichareininvertedword-order.Lookatthescreenandcomparethemcarefully.(Showthefollowingonthescreen.)1.Outrushedtheboy.Theboyrushedout.2Onlyinthiswaycanweloseweight.Wecanloseweightonlyinthisway.T:Whocantelluswhichareinnormalword-order?S:Iknow.Thesecondsentenceineachpairisinnormalword-orde

4、r.T:Howdoyouknow?S:Ifthepredicatecomesafterthesubject,itisinnormalword-order.T:Verygood.Sothefirstsentenceineachpairisininvertedword-order.Inthefirstpair,thewholepredicateofthefirstsentencecomesbeforethesubject,inthesecondpair,partofthepredicateofthefirstsentencecomesbeforethesubject.Now,

5、pleaselookatthescreen.(Showthefollowingonthescreenandmakebriefexplanationifnecessary.)Word-ordernaturalword-order:S+Vinvertedword-orderV+SAuxiliary/Modal+S+VStepHISummaryandExplanationT:Ifthepredicateverbisplacedbeforethesubject,thesentenceissaidtobeininvertedword-order.Suchaword-orderisc

6、alledinversion.Weuseinversionfortworeasons.Onefortheneedofthegrammaticalstructureofagiventypeofsentence,theotherforemphasisofacertainpartofasentence.Inversionhappensinquestions,andinanumberofothercases.Therearetwomainkindsofinversion.Insomecasesthewholeverbcomesbeforethesubject.Thiskindof

7、inversioniscalledfullinversion.Andinmostcases,anauxiliaryverboramodalverbcomesbeforethesubjectandtherestofthepredicateverbcomesafter.Ifthere'snoauxiliaryormodalverb,“do”“does”or“did”shouldbeadded.Thiskindofinversioniscalledpartialinversion.Now,let’smakeasummaryofthe