总复习教案之语法专题（四）⑴现在进行时(Pastcontinuoustense)[Unit5,7A]与过去进行时(Presentcontinuoustense)[Unit6,8A]⑵从属连词while/when/as的用法[Unit6,8A、Unit4,9A]现在进行时的结构：am/is/are+v-ing（肯定形式）amnot/isn’t/aren’t+v-ing（否定形式）am/is/are/+主语+v-ing（疑问形式）现在进行时中常用的时间状语或提示语：now/rightnow/atpresent/atthistime/atthismoment/……thesedays/from5to7/frommorningtoeveningIt’s5o’clock./Whereis/are…?/……Look!/Listen!Thereis/aresbv-ing.while/……过去进行时的结构：was/were+v-ing（肯定形式）wasn’t/weren’t+v-ing（否定形式）was/were+主语+v-ing（疑问形式）过去进行时中常用的时间状语或提示语：then/atthattime/atthatmoment/(at)thistimeyesterday/at6:30yesterday/……from8to12lastSaturday/……while/as3．长V---长时间的行为（可延续性动词），一般用现在进行时或过去进行时短V---短时间的行为（短暂性动词），一般用一般现在时或一般过去时当一个长时间行为（长V）发生时，另一个短时间行为（短V）稍后发生了while/as/when引导的从句+主句也可以用：主句+while/as/when引导的从句①While/As/WhenIwasdoingsomeshopping,theearthquakestarted.②While/As/WhenMilliewaswatchingTV,Andycameintotheroom.③While/As/WhenMilliewaswalkingpastthebookshop,shesuddenlythoughtofbuyingaTVguide.④While/As/Whenyouarewatchingtheshow,writedownyouranswersandsendtextmessageto1396.此时如果主句和从句的主语相同,while/when引导的从句可以用while+v-ing的形式：如例④可以为：While/Whenwatchingtheshow,writedownyouranswers当一个长时间行为（长V）发生时，另一个长时间行为（长V）同时在发生While引导的从句+主句也可以用：主句+while引导的从句①Whilepiecesofglassandbrickswerefallingdown,peoplewererunningwildly.=Peoplewererunningwildlywhilepiecesofglassandbrickswerefallingdown.②WhileMilliewaswatchingTV,Eddiewassleeping.=EddiewassleepingwhileMilliewaswatchingTV.③WhileMumiscooking,wearechattinginthesittingroom.=WearechattinginthesittingroomwhileMumiscooking.当一个短时间行为（短V）发生时，另一个长时间行为（长V）正在发生when/as引导的从句+主句也可以:主句+when/as引导的从句①When/AsSimonarrived,Amywasgettingsomesnowfromtheground.=Amywasgettingsomesnowfromthegroundwhen/asSimonarrived.②When/AsIsuddenlyheardsomenoiseaboveme,Iwastryingtofindmywayout.=Iwastryingtofindmywayoutwhen/asIsuddenlyheardsomenoiseaboveme.③When/Asyouphonedme,Iwasskatingontherice.=Iwasskatingonthericewhen/asyouphoned.（后一种句式中的when/as通常可以翻译成“就在那时”“在……的同时”）当一个短时间行为（短V）发生时，另一个短时间行为（短V）同时