1、上海教育出版社 英语 八年级上册Unit 5 语法 现在完成时延续性动词和短暂性动词单位：深圳市罗湖区松泉中学教师：李文娟The film _ for ten minutes.A. has begun B. has been on常见的延续性动词有： live, work, study, learn, sleep, stay等，延续性动词可以和表示一段的时间状语连用。e.g. They have lived here for 10 years.延续性动词是指动作发生后还可以延续一段时间或者相当长的一段时间。短暂性动词也称做终止性动词、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
2、动作。常见的短暂性动词有 ： come, go, arrive, reach, see, hear, close, open, leave, begin, start, lose, buy, fall, join, die, become, borrow, get up等 短暂性动词的用法：1. 短暂性动词可以用于现在完成时，但是它的肯定式不能与表示一段时间的 for或 since或how long等 状语 连用。e.g.I have borrowed the book.()I have borrowed the book for a week.()2. 而在否定句中，短暂性动词也可以用表示一
3、段时间的状语来修饰。e.g. I havent heard from Uncle Wang for a long time.3.用一般过去时来表达。e.g. He came back a week ago.4.用 “ It is 一段时间 since” 句型来表达。e.g. It is a week since he came back.got to be in短暂性动词转换成延续性动词，常用的有以下几个：open be opengo there be income here be hereget out be out fall asleep be asleepbuy havecome to
4、be ingo to be injoin be inbe a soldier/ member ofleave be away borrow keep begin be on finish be over die be dead marry be married close be closedbe thereI have bought the book.=I bought the book a week ago.=I have had the book for a week.=I have had the book since a week ago.巩固练习 ：（同义转换，每空一词） .Li L
5、ei joined the army three years ago.Li Lei the army three years ago.Li Lei a _ three years.three years Li Lei joined the army. 2.My father left Gucheng last week. My father Gucheng a week.3.The factory opened in 1996.The factory since 1996.has been in sincehas been forItssincehas been away from forhas been opensoldier
