人教版（2019）选修三Unit 4 Adversity and Courage Discover Useful Structures课件

Period3DiscoverusefulstructuresGrammar–PresentPerfectContinuousTense现在完成进行时DiscoverusefulstructuresWearenowcampedontheiceandwehavebeenmanagingtosurvive,butspringiscoming,andtheicewillsoonbegintomelt.Wehavebeenstrugglingfordays,butthingsonElephantIslandaregoingfrombadtoworse.DiscoverusefulstructuresQuestion1:Whichtenseisusedtoemphasisethecontinuationoftheaction?ThisistheadventurethatIhavebeendreamingof.ThisistheadventurethatIhavedreamtof.Question2:Whichtenseisusedtotalkaboutafinishedaction,andwhichisaboutanunfinishedaction?Wehavebeenmanagingtosurvive.Wehavemanagedtosurvive.Question3:Whichtenseisusedtoemphasisethelengthoftime?Wehavebeenstrugglingfordays.Wehavestruggledfordays.DiscoverusefulstructuresGrammarPoints:现在完成时结构：have/hasdone现在完成进行时结构：have/hasbeendoingTomhasbeenpaintingthefence.Hisclothesarecoveredinpaint.Thefenceusedtobewhite,butnowitisgreen.Tomhaspaintedthefence.现在完成进行时与现在完成时的区别总结如下：1.现在完成进行时强调动作的延续，而现在完成时强调动作的完成。例如：Ihavebeenreadingthebookyoulentme,butIhaven'tfinishedityet.Discoverusefulstructures2.现在完成进行时多用来询问和表达一个正在发生的动作或活动延续多长时间，而现在完成时多用来询问和表达一个已结束的动作或活动所完成的分量和频率。例如：Howlonghaveyoubeenplayingbasketball?Ihavebeenplayingbasketballfor12years.Maryisstillworkingonherpaper.She'sbeenworkingonitsincelastFriday.Howmanyfishhaveyoucaughtbytheriver?Howmuchmoneyhaveyousavedforyournextholiday?Shehasbeentothepianoclasstwicethisweek.Discoverusefulstructures3.部分动词(如live、work、teach,study等)用这两种时态所表达的意思差别不大。例如：I'velived(beenliving)herefor30years.Howlonghaveyouworked(beenworking)here?4.另外，有些动词一般不用于进行时态。除了语法注释中所列的不具有延续性的动词以外,还包括like、love、hate、want、need、prefer、know、realise、mean、understand、believe、remember,belong、contain、consist、seem等。Discoverusefulstructures–课本P105DiscoverusefulstructuresDidthisactionstartfromthepastandlast/repeattillnow?Isitlikelythatthisactionwillcontinueinthefuture?Isthespeakerexpressingstrongemotioninthissentence?Isthespeakertryingtoemphasisetheactionhaslastedlong?DiscoverusefulstructuresStevehasbeenplayingrugbysincetheageofeight.Nowhehasbecomeaprofessionalplayer.….Helooksalittletiredbecausehehasbeenplayingtabletennisfortwohours.Dianehasn’tbeensleepingwellthisweek.Shelooksterribletoday.Ihavebeentryingtophoneyouthismorning.ImusthavetriedadozentimesbeforeIcaughtyouhere.DiscoverusefulstructureshasbeendiscussinghasbeenlearningtriedworkedfinishedhasbeencollectingislaunchinghaslaunchedlaunchedDiscoverusefulstructuresDoyouhaveanyhobbiesorinterests?Howlonghaveyoubeenlearning/playing…?Whathaveyoubeendoingrecently?Discoverusefulstructures–PracticemakesperfectDoyouhaveanyhobbies?Sure.Ihaveseveralhobbiessuchastabletennis,photography,andkiteflying.Butmyfavouritehobbyisplayingtheguitar.Discoverusefulstructures–PracticemakesperfectHowlonghaveyoubeenlearningtheguitar?IhavebeenlearningtheguitarsinceIwaseightyearsold.IsawavideoofsomeoneplayingandIfellinlovewithitDiscove