外研版八年级下册,Module4Unit3课件.ppt

1.I have already had lunch. I’m not hungry. 2.He hasn’t seen the film yet. 3.We have never been to Beijing . 4. He isn’t here. He has gone to the library. 5.Have astronauts ever travelled to the Mars? 6.I have just finished my homework. for与since 的区别 1.for +时间段（three hours, two years) 2.since+时间点(1998,last Saturday,) 3.since + … ago (three years ago) 4.since+句子（用一般过去时态） 现在完成时用法（二） 表示从过去某一时间开始的动作或状态，一直持续 到现在，或者有可能一直持续下去。 I have lived here since I was born . I have been ill for three days 常与表示一段时间的since ，for, since then和how long, so far, in the last (past)…years 等连用。 How to solve this problem? 我们遇到句子有since, for, how long 的时候， 我们必须想办法把短暂性动词变为持续性动词。 常见的短暂性动词及其转换如下： buy ---- have borrow---- keep open ---- be open close ----- be closed leave ---- be away (from) die ------ be dead join ---- be in… / be a member in … begin /start------ be on come/arrive----- be in/at become ---- be catch a cold – have a clod ① The dog died two months ago.( ) ② The dog has died for two months.（ ） ③ The dog has been dead for two months.（ ） ④ The dog has been dead since two months ago.( ) 1. 并非所有有for/how long句子都用现在完成时 　　 I worked in Beijing for 10 years. 　我以前在北京工作了10年。(我现在已不在这里工作。）　 I have worked Beijing for 10 years.　　　 　我在北京工作了10年。(现在我仍在这里工作。) 1、他已经到了。 2、他已经离开了。 3、电影已经开始了。 4、我感冒了。 5、他借了一本书。 6、他们已经成为了朋友。 1、他已经到了。 他已经到了两个小时了。 2、他已经离开了。 他已经离开两天了。 3、电影已经开始了。 电影已经开始10分钟了。 4、我感冒了。 我感冒几天了。 5、他借了一本书。 他借了这本书两周了。 6、他们已经成为了朋友。 他们自五年前就成为了朋友。 选择题： 1. How long may I _____ the book? A. borrow B. keep C. lend 2. He ______ since 1995. A. has bought the bike B. has left his hometown C. has kept the book 3. The plane _______ here for ten minutes already. A. has arrived B. has been C. has stopped 4. He ______ for ten years. A. has been married B. married C. has married 5. Mr Black ____ China for many year