现在完成时课件

课件13张PPT。完成时态的用法1）现在完成时态表示 过去发生的动作对现在造成的影响或结果 。 Our teacher has left . We have studied English . I have already finished the homework . He has had his lunch . He has become a doctor .Have / has + 过去分词1. 构成2. 意义2）某个动作从过去已经开始， 一直持续到现在, 还有可能持续到将来，动作的 持续性要通过一段时间来表示。一段时间的表达方法有 两 种: For : + 一段时间 for a year for two weeks for three yearsSince ：过去的某一时刻, since nine since last week 一般过去时态的时间状语从句, since you came. since you got home. ! :for 和since 所引导的时间状语都表示一段时间. 对划线部分提问都用 How long .1） He has been away since last week .2）He has been away for one week .对下列划线部分进行提问。练一练 ：结束性动词不能和表示一段时间的时间状语连用,但是他可以转换成相应的延续性动词.1. 直接用 延续性动词 buy – catch(get) a cold – borrow — Come/go /become — put on —2. 转换成 be+名词 join the army – Join the Party – go to school – Have have a coldkeep bewearbe a soldierbe a Party memberbe a student3. 转换成 be + 形容词或副词 die — finish – begin — leave — be away fall sleep – be asleep close – be closed4. 转换成 be + 介词短语 go to school – be in school join the army – be in the armybe deadbe overbe on1.我们买这本书三年了.We have had the book for three years .2.他感冒三天了. He has had a cold for three days.We bought the book three years ago . He caught a cold three days ago.一般过去时态和现在完成时态可以构成 同意句3.自从上星期我借的这本书 I have kept the book since last week.4.我成为一个学生两年多了. I have been a student for over two years. I borrowed the book last week.I became a student two years ago.5.Mr Black死了三年了。Mr Black has been dead for three years.Mr Black died three years ago.6.小名参军半年了。Xiao Ming has been a soldier for half a year.Xiao Ming joined the army half a year ago.7.我们上了8年学了。We have been students for eight years.8.下课10分钟了。 The class has been over for ten minutes.9.电影开始了一小时了。 The film has been on for an hour.注：含延续性动词的现在完成时的同义句 转换 。She began to work ten years ago.She has worked since ten years ago.It is ten years since she began to work.Ten years has passed since she began to work. She has worked for ten years.Exercises1.You’ve never seen such a wonderful film before, _____? A haven’t you B have you C do you D don’t you 2. --Ann has gone to Shanghai. --So ____ her parents. A has B do C did D have 3. – I have watched the game. --When ____ you ____ it? A have watched B do watch C did watch D will watch B D C4. Mr. Green ____ in China since five years ago. A lived B has lived C lives D is going to live 5. His grandma _____ for two years. A died B has been dead C was dead D has died6. –Where is Han Mei now? -- She ____ to Shanghai. She will be back in two days. A has gone B has been C goes D had gone 7. --_____ to the United States ? -- No, never,but I went to Canada a few years ago. 8. You haven’t changed your mind,_____? A do you B are ... ...