人教版英语八年级下Unit9 语法（现在完成时）课件.ppt

秦老师全品英语课堂,Haveyoueverbeentoanamusementpark,I构成：have/has动词过去分词（1）has用于主语是第三人称单数,have用于其它人称。（2）动词的过去分词构成分为规则动词和不规则动词。规则动词在词尾加ed，其规则与过去式一样。不规则动词要记住。,现在完成时用法,表示经历或经验。常与ever或never连用。如：HaveyoueverbeentoHongKong?Ivenevertraveledbyair.表示最近发生的动作或情况。常与yet或already连用。如：,用法,Ihavealreadywrittentoher.Shehasntspentmuchtimeonityet.表示刚刚发生过的动作或事情，常与just连用。Theyhavejustsentusatelegram.Shehasjustcomehere.,表示过去发生，目前还有可能仍在继续下去的动作或事情。常与since或for连用。Hehaslivedtheresince1950.Wehaveknowneachotherformorethantenyears.,结束性动词不能和表示一段时间的时间状语连用,但是他可以转换成相应的延续性动词.,1.直接用延续性动词buyhaveborrowkeepcatch(get)acoldhaveacoldcome/go/becomebeputon-wear,2.转换成be+名词jointhearmybeasoldierJointhePartybeaPartymembergotoschoolbeastudent,3.转换成be+形容词或副词diebedeadfinishbeoverbeginbeonleavebeawayfallsleepbeasleepclosebeclosed,4.转换成be+介词短语gotoschoolbeinschooljointhearmybeinthearmy,.,1.我们买这本书三年了.,Wehavehadthebookforthreeyears.,Weboughtthebookthreeyearsago.,一般过去时态和现在完成时态可以构成同意句,2.他感冒三天了.,Hehashadacoldforthreedays.,Hecaughtacoldthreedaysago.,3.自从上星期我借的这本书,Ihavekeptthebooksincelastweek.,Iborrowedthebooklastweek.,4.我成为一个学生两年多了.,Ihavebeenastudentforovertwoyears.,Ibecameastudenttwoyearsago,5.MrBlack死了三年了。,MrBlackhasbeendeadforthreeyears.,MrBlackdiedthreeyearsago.,6.小名参军半年了。,XiaoMinghasbeenasoldierforhalfayear.,XiaoMingjoinedthearmyhalfayearago.,7.我们上了8年学了。,Wehavebeenstudentsforeightyears,当有一个表示过去某时的状语时，不能用现在完成时，而多用一般过去时。IsawMaryanhourago.Shelostherhandbagyesterday.,Next,现在完成时与一般过去时的区别,现在完成时强调动作或事情发生在过去，一直延续到现在，而且还有可能继续延续下去；而一般过去时只表示发生在过去的动作或事情。Ihavetaughtthisclassfortenyears.（还在教）Itaughtthisclassfortwoyears.（曾教过两年，现在不教了）,1.Where_you_,John?Imlookingforyoueverywhere.A.have;beenB.have;beentoC.have;goneD.did;goto2.Howlong_yourfather_Shanghai?A.did;comeB.has;gotoC.has;beentoD.has;beenin,选择,A.have;been,D.has;beenin,3.I_mywatchinmybedroomyesterday.A.leftB.forgotC.haveforgottenD.haveleft4.Shehasworkedinthefactory_.A.sincethreeyearsagoB.for1999C.sincein1999D.sincethreeyears,A.left,A.sincethreeyearsago,WhendidYaoMingstartplayingbasketball?,HowlonghasYaoMingbeenplayingbasketball?,YaoMingssportslife,成龙（JackieChan）1954:beborn1961now:act,Hehasbeenactingfor44years.,HowlonghasJackieChanbeenacting?,Hehasbeenactingsincehewas7yearsold.,Hehasbeenactingsince1961.,时间状语:1.for+一段时间2.since+过去的时间点3.since+一般过去时的句子,表示动作从过去某一时间开始一直延续到现在或离现在不远的时间。其动作是否继续下去，由上下文而定。这个时态多用于延续性动词。,现在完成进行时,构成：have/hasbeen+V.ing+,1997,2005,startedplayingtabletennis,stoppedplaying,1989,2005,hasbeenplayingbasketba