英语人教版八年级下册过去进行时中的when和while的用法区别

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1、Period3SectionAGrammarfocusTeachingAims:Studentssumuptheusageofwhenandwhileinthepastprogressivetensebyobservingthedifferentcontextandcanusethemcorrectly.TeachingProcedure:Step1lead-inPresenttwosentencesfromthetextbookwithwhenandwhile.Askstudentsiftheycantellthedifferencesbetweenwhenandwhileinpas

2、tprogressivetense.Step2Presentation1.Presenttwosentenceswithwhenandfillintheblankstoconcludetheusageofwhen.①IwaswalkingtoschoolwhenIsawacatinatree.②WhenSallyarrivedhome,hermotherwascleaningthehouse.主句的动作是持续性的，而从句动作是短暂性的，此时用_______引导时间状语从句，主句用_____________时态，从句用一般过去时态。2.Presentsentenceswithwhilea

3、ndfillintheblankstosummarizetheusageofwhile.③WhileIwassleepinginthebedroom,someoneknockedatthedoor.④Davidfellwhilehewasridinghisbike.主句的动作是短暂性的，从句的动作是持续性的，此时用_________引导从句，主句用____________时态，从句用过去进行时态。⑤WhileAndywaswaitingforthebus,hewasreadinganewspaper.⑥HewascleaninghiscarwhileIwascooking.主句和从句的

4、动作在过去的某时刻或某段时间同时发生，而且动作都是持续性的，此时用_________引导从句，而且主句和从句都用_____________时态。3.Concludethedifferencesbetweenwhenandwhile.Step7ExercisesFillintheblankswithwhenandwhile.Step8SummaryBlackboardDesign:WhenWhile1.主句（一般过去时）+while+从句（过去经行时）2.主句（过去经行时）+when+从句（一般过去时）3.主句（过去经行时）+while+从句（过去经行时）4.主句（一般过去时）+when

5、+从句（一般过去时）