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课件网) Unit 13 We’re trying to save the earth! Period(Three) Section A(grammar focus-4c) 版本:人教版九年级全册 Objectives 1. Learn curriculum words and useful expressions: take part in, afford, turn off, reusable, pay for... 2. Summarize grammars about Present progressive, used to, Passive voice, Present perfect, Modal verbs. 不同种类的污染 2. 河底 3. 把垃圾扔到河里 4. 在……中起作用 different kinds of pollution the bottom of the river throw rubbish into the river play a part in I. Check if you know these phrases. 5. 在中国南部 6. 对……有害 7. 在……顶部 8. 海洋生态系统 in southern China be harmful to at the top of… the ocean’s ecosystem Revision II. Translation. 1. 这个方法不仅残酷还对环境有害。 This method is not only cruel, but also harmful to the environment. 2. 鲨鱼处于海洋食物链的顶部。 3. 许多人相信鱼翅对健康有好处。 Sharks are at the top of the food chain in the ocean’s ecosystem. A lot of people believe that shark’s fins are good for health. Grammar Focus We’re trying to save the earth. Present progressive The river used to be so clean. used to The air is badly polluted. Passive voice No scientific studies have shown that shark fins are good for health. Present perfect We should help save the sharks. Modal verbs 一、现在进行时 表示现在正在进行或发生的动作，也表示现阶段或当前一段时间内正在进行的动作。 1.概念 2.基本结构 3. 标志词 now, at this time, these days, at the moment, listen, look等 be动词 (am/is/are) + 动词-ing形式 1. 我们现在正在河里游泳。 2. 听！琳达正在唱一首动听的歌。 3. 近来，鲨鱼正面临着艰难的生存环境。 We are swimming in the river now. Listen! Linda is singing a beautiful song. Sharks are facing hard living conditions these days. 翻译下列句子。 【拓展】 一些表示位置移动的动词，如 go, come, leave, arrive等，常用现在进行时表示将来。 例句：明天杰克将前往上海。 Jack is leaving for Shanghai tomorrow. 下列动词通常不用于现在进行时： ① 表示感觉或感情的动词，如smell, taste, seem, like, love, wish, hope等； ② 表示记忆、理解或决定等的动词，如remember, understand, decide, believe等﹔ ③ 表示拥有或占有的动词，如have, belong, own等。 二、现在完成时 表示过去发生的动作对现在造成的影响或动作从过去某个时间开始，一直延续到现在（包括现在在内）并可能继续延续下去。 1.概念 2.基本结构 3. 标志词 recently, since... , for ... , in the past few years等 have/has +动词的过去分词 在现在完成时中，come, go, arrive, leave, buy 等非延续性动词不能与表示一段时间的时间状语连用。若与表示一段时间的时间状语连用，非延续性动词要转换成相应的延续性动词或短语。常见的词如下: buy → have borrow → keep join → be a member of finish → be over die → be dead leave → be away begin → be on fall asleep → be asleep open → be open 【拓展】 比较现在完成时与一般过去时： 现在 5年 过去 has been a teacher 将来 例句：他当老师5年了。（5年前到现在一直是老师） He has been a teacher for 5 years. 现在 5年 过去 worked as a teacher 将来 例句：他当了5年老师。（现在不是老师了） He worked as a teacher for 5 years. 三、被动 ... ...
