1、1Unit 10 Section A 3 (Grammar focus 4c)学习目标： 知识目标掌握现在完成时的用法 能力目标正确区分现在完成时与一般过去时正确运用 for 和 since 的用法 情感目标正确处理并充分利用自己的废旧物品。 学习过程Step 1 Group work 出示 下面的典型例句，让学生们先自己观察句子结构，对比现 在完成时和一般过去时的不同。1. How long have you had that bike over there? 那边的那辆自行车你买了多长时间了？ Ive had it for three years. 我买了三年了。2. How long h
2、as his son owned the train and railway set? 他的儿子拥有这 套轨道火车多长时间了？Hes owned it since his fourth birthday. 自他四岁生日起，他就拥有了它。3. Have you ever played football? 你曾经踢过足球吗？Yes, I did when I was little, but I havent played for a while now.是的，当我很小时就踢过，但是现在我有好长一段时间没有踢了。Step 2 精讲点拨现在完成时表示从过去已经开始持续到现在的动作或状态，可以和表示“从
3、过去某一时刻延续到现在的一段时间状语”连用，如“for + 时间段” 、 “since + 过去时间点” 、 “since + 过去时的从句” 、 “since + 一段时间 + ago” 。且 for 与 since 引导的时间状语可以相互转换。e.g. My uncle has worked at this factory for ten years.= My uncle has worked at this factory since ten year ago. Ive lived here since 19902自从 1990 年以来 我就住在这里。 I havent seen him
4、 for three years.我三年没有看见他了。 Shes been at this school since five years ago. 自从五年前以来她就在这个学校。歌诀：含有 for， since 的现在完成时的用法歌诀: 过去的动作或状态，一直持续到现在，for、 since 把时间带句中动词的特点此种用法中表示持续性的 动作或状态的动词必须是延续性动词（否定句除外）1. 这本书我买了 5 年了。I have bought the book for five years. ( )Ive had the book for five years. ( )2. 你哥哥参军多长时间了
5、？How long has your brother joined the army? ( )How long has your brother been in the army/been a soldier? ( )非延续性动词和延续性动词之间的转换1. 转换为相应的延续性动词，用于现在完成时。borrow keep buy have put on wearcatch a cold have a cold get to know knowget to sleep sleep2. 转化为“be + 形容词/副词/介词/名词”begin / start be on go out be out c
6、lose be closed open be open get to/arrive/reach be (in)die be dead leave be away finish be overfall sleep be asleep join be in/be a member of become be make friends be friendscome/go be + 相应的介词短语Step 3 4a Rewrite the sentences using for or since1. Jim is in Japan. He arrived there three years ago.3J
7、im has been in Japan for three years.2. They are very hungry. Their last meal was ten hours ago.They have been hungry for ten hours/since ten hours ago.3. I have a camera. I bought it in 2009.I have had a camera since 2009.4. I know Ann. I first met her three years ago.I have known Ann for three yea
8、rs/since three years ago.5. Linda is ill. She became ill on Monday.Linda has been ill since Monday.Step 4 4b Fill in the blanks with correct forms of the verbs in brackets.1. I _ (never be) to the water park before. I want to _ (go) next month before the weather gets too cold.2. They _ (never own) a
9、ny pets, but they _ (always want) to have a dog.3. We _ (have) a piano since last November. We _ (buy) it from the Li family when they moved to the US last year.4. Cathy and Amy _ (not be) back to their hometown for two years. They _ (miss) their hometown a lot and hope to visit the place next year.
10、5. This museum _ (be) here for over 20 years. It _ (be) one of the oldest buildings in this small town.Step 5 Group work4c Fill in the questions and ask two students. Then complete the chart.1. Do you have a(n) _? How long have you had it?2. Do you own a(n)_? How long have you owned it?Things How longTony favorite book basketballfor two yearssince he was 10years oldStudent 1 4Student 2
