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1、Unit5Thepowerofnature本课时重、难点重点:①动词-ing形式的作用②动词-ing形式在做状语时的作用难点:动词-ing形式的一般式与完成式的区别观察下列例句,思考划线部分作用。(1)Thisisaninterestingbook.()(2)Themansittingbythewindowisourmathsteacher.()(3)Seeingtheteacherenteringtheroom,thestudentsstoodup.()(4)Isawtheboywalkingonthest
2、reetyesterday.()(5)Playingfootballishisfavotiresport.()(6)Ididn’tstopworkinglastnight.()(7)MyworkisteachingEnglish.()定语定语状语宾补主语宾语表语◆动词-ing是动词非谓语形式中的一种,单独使用时,能在句中做除_____之外的任何其他句子成分。如:主语、宾语、表语、定语、状语、宾补等。◆在语态上，动词-ing表示________(主动/被动的动作)。在时间上,动词-ing一般表示________
3、_(正在进行/已经完成的动作）。谓语主动正在进行Lookingcarefullyattheground,Imademywaytotheedgeofthecrater.HavingexperiencedquiteafewearthquakesinHawaiialready,Ididn’ttakemuchnotice.Lookingcarefullyattheground,I…HavingexperiencedquiteafewearthquakesinHawaiialready,I…The–ingformisu
4、sedasanadverbial.–ing形式的完成式所表示的时间在主要谓语动词之前The–ingformcanbeusedasanadverbialinasentencetogiveinformationabout_______,________,_____,______________________,etc.Itrainedheavily,causingseverefloodinginthearea.结果Beingtired,Istoppedtotakearest.Havingbeenwrittenin
5、haste,thebookhassomefaults.原因Walkingalongthestreet,ImetMary.Havingfinishedmywork,Iwenthome.时间Istoodthere,waitingforher.Theboywasleftthere,crying.伴随条件1.Havingwrittentheletter,Johnwenttothepostoffice.2.Seeingthebeautifulsight,thechildrenfeltexcited.V-ingdoing
6、havingdone表动作有先有后表动作同时发生1.___________himtheanswerseveraltimes,Ididn’tknowifhecouldunderstand.2._______________theanswerseveraltimes,hestillcouldn’tsolvethequestion.HavingtoldHavingbeentoldhavingdone主句主语为动作的发出者。主句主语为动作的承受者。havingbeendone3._________________(咬
7、)bythesnakeonce,shefeelsfrightenedwhen_______________(看到蛇).2.________________(听到这个消息),wegotexcited.1.______________________(刷完牙),Mr.Browncamedownstairsforbreakfast.HavingbrushedhisteethHearingthenewsHavingbeenbittenseeing分词短语做状语时,前面可以加上连词,如if,unless,when,wh
8、ile,once,though,etc.asnakearrive,give,spend,takeandbuy.1____________thewrongbus,Martinfoundhimselfinanunfamiliardistrict.2____________heropinionaboutprotectingtheenvironment,sheleftthemeeting.Havingtak
