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现在完成时中短暂性动词与延续性动词的转化也称做终止性动词、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．完成时态肯定句用法完成时态否定句用法其他用法需要转换成延续性动词的情况如何转化为延续性动词其他句型改写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.3.还可改用一般过去时来表达Heback.4.也可用“itis/hasbeen﹢时间﹢since…”句型在以下句型中，短暂性动词要转换成延续性动词：1.完成时态的肯定句2.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