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现在完成式中瞬间性动词如何变为延续性动词。在完成式中,一个瞬间性动词(一次性动作如buy，borrow,die,leave,begin,join等)不能与表示一段时间的状语(for,since,howlong等)连用,此时须将该瞬间动词改为延续性动词或状态动词.如：Heborrowedabooktwodaysago.(用现在完成式表达）Hehaskeptthebookfortwodays.他持有这本书两年了。1、他三年前买了一辆车。___________________________________2、他两年前参了军。___________________________________答案：1、Hehashadacarforthreeyears.或Hehasboughtacar.或Heboughtacarthreeyearsago.2、Hehasbeeninthearmyfortwoyears.或Hehasjoinedthearmy.Hejoinedthearmytwoyearsago.切记：有些动词是非延续的，在此用法中要换成其相对应的延续性动词：非延续性动词延续性动词非延续性动词延续性动词leavebeawayjoinbein/beamemberofborrowkeepopenbeopenbuyhavefallillbeillbegin/startbeongetupbeupdiebedeadcatchacoldhaveacoldmovetoliveincomeherebehereend／finishbeovergotherebetherecomebackbebackgetto/arrive/reachbeingettoknowknowputonweargo(get)outbeoutbecomebeHisfatherhasdied.Hisfatherhasbeendeadforthreeyears.他父亲已经去世三年了。ShehasjoinedtheParty/League.ShehasbeenintheParty/Leaguefortwomonths.=ShehasbeenaParty/Leaguememberfortwomonths.他已经入党/团两个月了。Thefilmhasstarted/begun.Thefilmhasbeenon/lastedsince5minutesago.电影已经开始5分钟了。HehasgonetoYangzhou.HehasbeeninYangzhoufor3days.他已经去扬州三天了。【习题】WhenJackarrivedhelearnedMary__________foralmostanhour．(leave)答案：hadbeenaway