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现在完成时非延续性动词与延续性动词的转化buy-haveleave-beawayborrow/lend-keep/havestart/begin-beongoto-beincome/arrive/get/reach/move---bein/atdie----bedeadbegin/start---beonfallasleep----beasleepclose---beclosedcatchacold---haveacoldputon----wearopen---beopenbecome-----beleave/go----beaway(from)finish/end---beovercome/goback----bebackgo/leave---beawaygettoknow----knowjoin----beamemberof/bein…come/arrive-----behere/inputon—weargotosleep---beasleepcatchacold—haveacoldmarry---bemarriedeg:(误)Ihaveboughtthebookfor2weeks.(正)Ihavehadthebookfor2weeks.(误)Thedoghasdiedfor5days.(正)Thedoghasbeendeadfor5days.2.Itis/hasbeen+段时间since+sentence(一般过去时)Eg:(误)HehasjoinedtheLeagueforthreeyears.(正)HehasbeenintheLeagueforthreeyears.(正)HehasamemberoftheLeagueforthreeyears(正)ItisthreeyearssincehejoinedtheLeague.他入团已三年了