初中现在完成时讲解与练习探讨.ppt

method 2: It is + 时间段 since + 一般过去时的句子. 他的爷爷已经去世2年了。 Nick 参军3年了. 他离开深圳好长时间了。 这本书我已借了4个月了. It is 2 years since his grandpa died. It is 3 years since Nick joined the army. It is a long time since he left Shenzhen. It is 4 months since I borrowed the book . Tom arrived in Shanghai two days ago. Tom has been in Shanghai for two days. It is two days since Tom arrived in Shanghai. ? since 用来说明动作起始时间— “自从……” for用来说明动作延续时间长度— “长达……” 　　I have lived here for more than twenty years.　　I have lived here since I was born.　　My aunt has worked in a company since 1949.　 　　I have not heard from my uncle for a long time. 比较since和for 注意：并非有for 作为时间状语的句子都用现在完成时 　　 I worked here for more than twenty years. 　　　(我现在已不在这里工作。) 　　 I have worked here for many years.　　　 　　　(现在我仍在这里工作。) He died 10 years ago. --- He has been dead for 10 years / since 10 years ago. 2. He borrowed the book 2 weeks ago. --- He has kept the book for 2 weeks. 3. He bought the motorbike a month ago. ---He has had the motorbike for a month. 4. He arrived here three days ago. --- He has been here since three days ago. 5. They turned on the light 2 hours ago. --- The light has been on for 2 hours. 延续性动词和瞬间性动词之间的转化 (keys) 6. He left here 2 years ago. --- He ____ ____ ____ from here for 2 years. 7. The film began 30 minutes ago. --- The film ____ ____ ____ for 30 minutes. 8. They opened the door an hour ago. --- The door ____ ____ ____ for an hour. 9. They closed the door an hour ago. --- The door ____ ____ ____ for an hour. 10. He joined the army last year. --- He ____ ____ a ____ for a year. --- He ____ ____ ____ the army for a year. --- It ____ a year ____ he joined the army. 6. He left here 2 years ago. --- He has been away from here for 2 years. 7. The film began 30 minutes ago. --- The film has been on for 30 minutes. 8. They opened the door an hour ago. --- The d