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现在完成时中(点动词)短暂性动词与延续性动词的转化也称做点动词、非延续性动词或瞬间动词。表示动作不能延续，只是一瞬间就结束的动作。come,go,arrive,reach,see,hear,close,open,leave,begin,start,lose,buy,fall,join,die,become,borrow,getup等．１.它们可以用于完成时态，说明某个动作的结果还存在Hehascomeback.Thefilmhasbegun.2.在否定句中，非延续性动词也可以用表示一段时间的状语来修饰Ihaven’theardfromUncleWangforalongtime.Wehaven’tseenhimsince1992.Shehasn’tlefthomeallherlife.在以下句型中，短暂性动词要转换成延续性动词：现在完成时态的肯定句中，有for或since引导的，或其他种类的表示一段时间的时间状语例如：Hehasdiedfor20years.这句话就是错误的。die是一个瞬间动词，需要转化为延续性动词。句子改为Hehasbeendeadfor20years.1.实义动词转化成实义动词2.转化成be+形容词或介词3.转化成be+名词（词组）HisgrandfatherHisgrandfatherHisgrandfatherHisgrandfatherItfiveyearshisgrandfatherFiveyearshisgrandfatherHisbrotherborrowedthebook.Hisbrotherborrowedthebook.Hisbrotherhaskeptthebook.Hisbrotherhaskeptthebook.It’stwoweekshisbrotherborrowedthebook.Twoweekshaspassedhisbrotherborrowedthebook.Hisbrotherjoinedthearmy.Hisbrotherjoinedthearmy.Hisbrotherhasbeeninthearmy.Hisbrotherhasbeeninthearmy.It’stwoyearshisbrotherjoinedthearmy.Twoyearshaspassedhisbrotherjoinedthearmy.8Bunit2课课练grammar部分有相关练习可自行完成，核对答案相关练习