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.
短暂性动词转换成延续性动词，常用的有以下几个：
buy come to go to got to join have be in be in be in be in be a soldier/ member of borrow begin get out keep be on be out leave finish die marry open close go there come here fall asleep be away be over be dead be married be open be closed be there in be here be asleep
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
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。
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 段时间的状语来修饰。
e.g. I haven’t heard from Uncle Wang for a long time.
been
in the armysince three years ago. _____ for three years. been a soldier
It’s three years since Li Lei joined the army.
2.My father left Gucheng last week. My father has
been away
from Gucheng for
a week.
3.The factory opened in 1996. The factory has been open since 1996.
I 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）
１.Li Lei joined the army three years ago. Li Lei has Li Lei has
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。
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.
短暂能延续，只是一瞬间就 结束的动作。