英语人教版八年级下册Unit5 Grammar Focus.ppt

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1、Unit5GrammarfocusWhatweretheydoingwhenitbegantorain?Theywereplayingcomputergameswhenitbegantorain.Theywereplayingchesswhenitbegantorain.Theywereplayingfootballwhenitbegantorain.WhileJakewassleeping,whatdidhisbrotherdo?Heplayedbasketball.WhenJakewassleeping,hisbrotherplayedbasketball.Whilethey

2、weredancing,thetelephonerang.Whenthetelephonerang,theyweredancing.Whiletheyweredancing,whathappened?Hewassingingwhenthebabystartedtocry.Whilehewassinging,thebabystartedtocry.Whilehewaswalking,ataxicame.Hewaswalkingwhenataxicame.Bothofthemmean“当……的时候”.Aretheythesame?No！！！whenandwhilewhenwhen引导

3、的时间状语从句可以表示一个时间点,也可以表示一个时间段。从句中可以用短暂性动词，也可以用延续性动词。Itwassnowingwhenwegottotheairport.我们到达机场时，天正下着雪。MykeydroppedonthegroundwhenIwaswalkinginthepark.我在公园散步时，钥匙掉在了地上。while引导的时间状语从句常指一个时间段,从句中的动词常为延续性的。while有时还可表示主句的动作与从句的动作同时发生。Whilehewasreading,thephonerang.他正在看书时，电话铃响了。Somestudentswerereadingwh

4、ileotherswerewriting.一些学生在读书，另一些学生在写字。while1)若从句是一个短暂性动作，主句是一个持续性动作，可用when但不用while：Itwasraininghardwhenwearrived.我们到达时正下着大雨。2)表示主、从句正在进行的动作或状态的对比时多用while：Whileshewasmakingaphonecall,Iwaswritingaletter.when和while的区别3)when可用作并列连词，表示“这时(突然)”，但while不可以；while可以用作并列连词，表示“而、却”(表示对比)，但when没有这种用法。Wewe

5、reabouttostartwhenitbegantorain.Helikescoffee,whileshelikestea.Practice1.I______________(watch)TVwhenshe_______(call).2.Whenthephone_______(ring),she___________(write)aletter.3.Whilewe____________(have)apicnic,it_________(start)torain.4.WhileJohn____________(sleep)lastnight,someone_______(ste

6、al)hiscar.waswatchingcalledrangwaswritingwerehavingstartedwassleepingstole5.Whilewe____________(wait)forthebus,agirl____________(run)uptous.6.I____________(telephone)afriendwhenBob__________(come)in.7.Whilemother___________(make)thebed,thedoorbell____________(ring).8.We____________(test)thene

7、wmachinewhentheelectricity________(go)off.werewaitingwasrunningwasphoningcameweretestingwentwasmakingrangTranslationTranslatethefollowingsentencesintoEnglish.1.当开始下雨的时候，我正和朋友们在操场上打篮球。Iwasplayingbasketballwithmyfriendsintheplaygroundwhenitstar