(
课件网) Unit 3 Trees and us 主题范畴： 人与自然 主题群： 环境保护 子主题： 热爱与敬畏自然，与自然和谐共生 Key question Why do we need trees understand what trees do for us. identify amazing facts about trees. describe what we can do to help protects trees. explain the relationship between trees and humans. Unit objectives 单元目标 I can: Tom, what are you doing now I am reading a book. Lead in What are they doing now They are playing basketball. What is the man doing now He is singing a song. What are the children doing now They are watching TV. I am reading a book. They are playing basketball. He is singing a song. They are watching TV. The present continuous 现在进行时 Li Na: Hi Wang Jie. What are you doing now Are you at home Wang Jie: No, my parents are away, so I’m staying with my grandmother this week. I’m watching a TV programme about trees. Li Na: Really Su Su and I are working on our group project. It’s about trees. Could you help us Wang Jie: Sure, no problem! We can meet up tomorrow after school. Li Na is talking to Wang Jie on thephone. Read the dialogue and pay attention to the words in bold. We use the present continuous to show that something is happening now. Presentation ①现在进行时态表示现在(说话瞬间)正在进行 或发生的动作。 ②现在进行时态还可以表示当前一段时间内的活动或现阶段正在发生的事情。如: 现在进行时的定义 What are you doing now I’m watching a TV programme about trees. No, my parents are away, so I’m staying with my grandmother this week. What’s the structure of the present continuous tense I am reading a book. They are playing basketball. He is singing a song. They are watching TV. be am is are + v.ing Think 现在进行时的结构 I am reading a book in the library. 肯定句: 主语+am/is/are+V-ing +其它. I am not reading a book in the library. 否定句：直接在am/is/are后加not. 现在进行时的句式 — Are you reading a book in the library — Yes, I am. / No, I’m not. 一般疑问句及回答: 问句，直接把am/is/are提句首, 若原句有第一人称，把第一人称变成第二人称。 肯定回答: Yes, 主语 + be (be是要变化的，即am/is/are). 否定回答: No, 主语+ be + not. What are you doing now 特殊疑问句： 格式为：What + am / is / are +主语+doing 时间状语 与现在进行时连用的时间状语： at present 目前；现在 at the moment 此刻；现在 right now 此刻；现在；立刻；马上 now 现在 提示语: look!/listen! 根据题目要求，完成下列句子。 1. They are doing the housework now. (分别改成一般疑问 句和否定句) Are they doing the housework now They aren’t doing the housework now. 2. The students are cleaning the classroom. (改为一般疑问句并作肯定和否定回答) Are the students cleaning the classroom Yes, they are./No, they aren’t. Practice 3. I’m playing football in the playground. (改为否定句) I’m not playing football in the playground. 4. Tom is reading books in his room. (改为一般疑问句) Is Tom reading books in his room 主要动词 现在分词 例子 大多数动词 以不发音-e结尾的动词 附加：以发音-e结尾的动词 以-ie结尾的动词 一些以一个元音 ... ...
