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, how long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：He borrowed a book two days ago.(用现在完成式表达）He has kept the book for two days.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、He has had a car for three years.或He has bought a car. 或He bought a car three years ago.2、 He has been in the army for two years.或He has joined the army. He joined the army two years ago.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leavebe awayjoinbe in/be a member ofborrowkeepopenbe open buyhavefall illbe illbegin/startbe onget upbe updiebe deadcatch a coldhave a coldmove tolive income herebe hereendfinishbe overgo therebe therecome backbe backget to/ arrive / reachbe inget to knowknowput onweargo (get) outbe outbecomebe His father has died.His father has been dead for three years.他父亲已经去世三年了。She has joined the Party/League.She has been in the Party/ League for two months.=She has been a Party/ League member for two months.他已经入党/团两个月了。The film has started/begun.The film has been on/ lasted since 5 minutes ago.电影已经开始5分钟了。He has gone to Yangzhou.He has been in Yangzhou for 3 days.他已经去扬州三天了。【习题】WhenJackarrivedhelearnedMary_foralmostanhour(leave)答案：had been away