现在完成进行时：表示从过去某时开始到现在这一段时间里一直延续的动作。现在完成进行式结构：have/has+been+doing/1．Ihavebeenwritingthelettersincethen.从那时起我一直在写这封信。（动作从过去一直持续到现在还在继续）2．Ihavebeencollectingstampsfortenyears.自从10年前我就收集邮票了（动作从过去一直现在还在收集）。3．Howlonghaveyoubeenlivinghere?你在这儿已经住了多长时间了。（“居住”动作从过去一直现在还在继续）现在完成进行时和现在完成时的区别：1现在完成进行时比现在完成时更强调动作的延续性：2如果没有时间强调，现在完成进行时表示动作仍在进行，现在完成时则表示动作已经结束，3现在完成进行时一般不适用于表状态的动词，而现在完成时则可：since和for的用法与区别for接一段时间，since接时间点eg:Wehavelivedheresince2000.Wehavelivedherefor10yearsSince用来说明动作起始时间，for用来说明动作延续时间长度。Ihavelivedhereformorethantwentyyears.IhavelivedheresinceIwasborn..Myaunthasworkedinaclinicsince1949.Somenewoilfieldshavebeenopenedupsince1976.IhaveknownXiaoLisinceshewasalittlegirl.MybrotherhasbeenintheYouthLeaguefortwoyears.Ihavenotheardfrommyuncleforalongtime.注意：并非有for作为时间状语的句子都用现在完成时。Iworkedhereformorethantwentyyears.(我现在已不在这里工作。)Ihaveworkedhereformanyyears.(现在我仍在这里工作。)小窍门：当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。(对)TomhasstudiedRussianforthreeyears.=TombegantostudyRussianthreeyearsago,andisstillstudyingitnow.2)(错)Harryhasgotmarriedforsixyears.=Harrybegantogetmarriedsixyearsago,andisstillgettingmarriednow.显然，第二句不对，它应改为Harrygotmarriedsixyearsago.或Harryhasbeenmarriedforsixyears1.Jimmyhasbeenteaching(teach)Englishfor5years.2.Hehasbeenplaying(play)footballsincehewas9.3.Wehavebeenworking(work)heresincelastSunday.4.Myfatherhasbeencollecting(collect)parkticketsfor10years.5.Mylittlebrotherhasbeenwatching(watch)TVfor3hours.6.SamandIhavebeenreading(read)magazinesforhalfanhour7.Thestudentsandteacherhavebeencleaning(clean)theclassroomsince2o’clock.1、threeandahalfyears=threeyearsandahalf三年半---HowlongcanIkeepthebook?---_______.A.halfdaysB.twoandhalfadaysC.halfadayD.ahalfday2一座有花园的房子ahousewithagarden一所带游泳池的房子ahousewithaswimmingpool1.—_______haveyoubeenskiing?—Halfayear.A.HowlongB.HowoftenC.HowfarD.When2.He_____TVforthreehours,andhe’sstillwatchingnow.A.hasbeenB.watchedC.hasbeenwatchingD.iswatching3.Sam______coinssincehewaselevenyearsold,andnowhe