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1.PoliceinAmericahavesteppeduptheirsearchforafifteen-year-oldboywhowentmissingtwodaysago.2.Everyonehasshowngreatinterestinhisdisappearanceduetosightingsofpuzzlinglightsinthesky.3.SomepeopleinDoveralsosaythattheyhaveseenaliens.4.PolicehavenotruledoutthepossibilitythatJustinwastakenbyaliens.5.Photoshavebeentakenandsampleshavebeencollectedfromtheplants,butnoevidenceoflifehasbeendiscovered.6.Whoelsehasbeentakenbythealiens.Presentperfecttense:have/has+过去分词被动语态：have/has+been+过去分词1.ThedisappearanceofJustinhasmadeKellyveryunhappy.Justin的失踪让Kelly非常难过。（Justin在过去失踪，但是Kelly至今都在为他的失踪感到难过）2.Ihavehadmylunch.我已经吃过午饭了。（过去吃了，现在不饿。）动作或状态发生在过去，但仍然对现在产生影响。3.IhavenotseenJustinsincelastFridaynight.从上周五晚上到现在一直都没有见到过Justin。（到现在还没有见到）4.ThepolicehavenotfoundJustinsincehisdisappearance.从Justin失踪到现在警察一直没找到他。（至今还没有找到）过去开始的动作一直延续到现在，并对现在产生影响。5.SomevillagerssaythattheyhaveseenUFOsmanytimes.村民们曾多次看到UFO。6.Wehavehadfourteststhisterm.我们这学期进行了4次考试。过去某一时间到现在这段时间内反复发生的动作。7.Theboyhasalreadycomehome.这个男孩已经回家了。Theboyhasn’tcomehomeyet.这个男孩还没有回家。8.Wehaven’tseenhimfortwoyears.我们有两年没有看到过他了。Wehaven’tseenhimsincetwoyearsago.9.Thepolicehavejustfinishedsearchingthearea.警方刚结束了对该地区的搜查。常与现在完成时连用的时间状语：already,yet/never,ever/for,since/lately,recently/just/before/uptonow/sofar/sincethen/inthepast(last)+表示一段时间的词语Differencesbetweenthepresentperfecttenseandthepasttense1.PoliceinAmericahavesteppeduptheirsearchforafifteen-year-oldboywhowentmissingtwodaysago.PoliceinAmericasteppeduptheirsearchforafifteen-year-oldboywhowentmissingtwodaysago.2.ThedisappearanceofJustinhasmadeKellyveryunhappy.ThedisappearanceofJustinmadeKellyveryunhappy.3.Theboyhasalreadycomehome.Theboycamehomeyesterday.4.HehaslivedinTianjinfortenyears.HelivedinTianjinfortenyears.pastnowfuturepastnowfuture一般过去时只表示某个动作或状态曾经发生过，与现在没有联系，一般与过去具体时间连用。而现在完成时则是过去的动作或状态延伸到现在，并对现在有影响。Youarewritingaboutafriend’stravelsinyourdiary.Completeyourdiaryentryusingthecorrectformsoftheverbsinbrackets.1.I_____inChinafor15years.Ilikeeverythinghere.A.workB.workedC.hasworkedD.haveworked2.----Thelittleboy_____toplaytheviolinalready.----Great!When____hestart?-----Lastmonth.A.learned;hasB.learned;didC.haslearned;hasD.haslearned;did3.----Whereisyourlittledaughter?----Oh,she____tomymother.Ihavenotimetolookafterher.A.sentB.hasbeensentC.wassentD.hassent4.(1)ItisthefirsttimethatI______thiskindofmachine.(2)ItwasthefirsttimethatI_______thiskindofmachine.A.usedB.haveusedC.hadusedD.use5.It______fiveyearssincehe_____hishometown.A.was;leftB.hasbeen;leftC.hasbeen;hasleftD.was;hasleft1.Ihaven’tbeensleepingwellsinceIreturnedhome.自从我回到家以来我一直都没有睡好。2.Wehavebeenlookingatotherpossibilities,suchasmurder.我们一直在找寻其他的可能性，比如说谋杀。3.Whatbookhaveyoubeenreadingrecently?你最近一直在读什么书？4.----SorryI’mlate.Haveyoubeenwaitinglong?----Yes.Ihavebeenwaitingforanhour.Presentperfectcontinuoustense:have/has+been+动词ingTheusageofthepresentperfectcontinuoustense:(1)表示过去开始的动作一直延续到现在并仍在继续之中；(2)表示从过去某时开始，一直延续到说话的时候，刚刚结束的动作，并仍与现在有关联。Differencesbetweenthepresentperfectcontinuoustenseandthepresentperfecttense1.Theyhavebeenrepairingthebrokenroad.他们一直在维修那条被损坏的道路。（动作仍在继续）Theyhavealreadyrepairedthebrokenroad.他们把那条被损坏的道路修好了。（动作已经结束了）现在完成进行时和现在完成时都表示动作从过去开始，但是现在完成进行时强调动作仍在继续，而现在完成时可表示事件或动作刚结束。2.(1)Ithasbeenrainingforaweek.(2)Ithasrainedforaweek.雨一直下了一个星期。雨已经下了一个星期。3.(1)IhavebeentouringEgyptfortwomonths(2)IhavevisitedEgypttwicethismonth.现在完成进行时表示动作不间断，强调non-stopactions;而现在完成时表示反复发生的动作，强调repeatedactions。Differencesbetweenthepresentperfectcontinuoustenseandthepresentperfecttense4.Howlonghaveyoubeenwritingthisletter?Howmanytimeshaveyouwrittentoyourparents?现在完成进行时表示动作不间断，提问时用howlong;而现在完成时表示反复发生的动作，提问时用howmanytimes。5.Wehavebeenlookingatotherpossibilities,suchasmurder.Theboyhasalreadycomehome.Thefamilyhasbeenhereforover20years.现在完成进行时只能用表示动作的动词做谓语;而现在完成时可以用表示动作的动词或者是表示状态的动词。注意：表示动作的动词不能与一短时间连用：Theyhavegotmarriedfor5years.(误)→Theyhavebeenmarriedfor5years.Theoldmanhasdiedfor3years.(误)→Theoldmanhasbeendeadfor3years.→Theoldmandied3yearsago.1.----Hi,Jack.Youlooksotired.What’swrongwithyou?----I_____myhousewithmymotherfor2hours.A.amcleaningB.wascleaningC.havebeencleaningD.havecleaned2.----Hi,John,I_______youforweeks.What______recently?----Carryingonsomeresearchonwildlife.A.havebeenseeing;haveyoubeendoingB.haveseen;haveyoubeendoingC.haveseen;haveyoudoneD.havebeenseeing;haveyoudone3.She_____onthisarticlefortwentyminutesbutshehaswrittenonlyaboutahundredwords.A.willbeworkingB.workedC.hasbeenworkingD.willhaveworked