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现在完成时中非延续性动词（瞬间动词）与延续性动词的转换leave→beaway离开;borrow→keep借;buy→have买;begin/start→beon开始/上演;die→bedead;finish／end／stop→beover结束/完成join→bein+组织机构或beamemberof+组织机构；open/closesth→keepsthopen/closed；fallill→beill；getup→beup；catch／getacold→haveacold感冒；comehere→behere；gothere→bethere；become→be成为；comeback→beback；fallasleep→beasleep睡着；getto/arrive/reach→be(in)；leave→beawayfrom；gettoknow→know；go(get)out→beout；puton→wear；catchacold→haveacold;gotoschool→beinschool／beastudent上学;goabroad→beabroad去国外;marry→bemarried（to）结婚;wakeup→beawake醒;makefriendswith→befriendswith成为/交朋友;lose→belost／bemissing／begone丢失;loseone'sjob／work→beoutofwork／ajob请看例句1.Theoldmandied4yearsago.→Theoldmanhasbeendeadfor4years.→Itis4yearssincetheoldmandied.→Fouryearshaspassedsincetheoldmandied.请看例句2.HejoinedtheParty2yearsago.→HehasbeeninthePartyfor2years.→HehasbeenaPartymemberfor2years.请看例句3.Hejoinedthearmy5yearsago.→Hehasbeeninthearmyfor5years.→Hehasservedinthearmyfor5years.→Hehasbeenasoldierfor5years.请看例句4.Iboughtthebook5daysago.→Ihavehadthebookfor5days.