(
课件网) Unit 13 We are trying to save the earth! Section A (Grammar focus-4c) 情景式教学语法课公开课 人教新目标版 九年级(下册) Learning objectives 1.学习本课新词汇：take part in ,afford, turn off, reusable, pay for, take action, transportation 掌握句型: We can’t afford to wait any longer to take action! Have you ever taken part in an environmental project We should help save the sharks. No scientific studies have shown that shark fins are good for health. The river used to be so clean. The air is badly polluted. 2. 通过观看视频，能够找出不同事态的句子，通过翻译Grammar focus里的句子，能够说出现在进行时、现在完成时、情态动词、被动语态、used to的表意功能和用法。 3.通过观看视频回答问题能够谈论污染问题，能在实际情景对话中认识解决空气污染和垃圾污染的方法。 Let’s watch the video and pay attention to the grammar of sentences. Can you find out the sentences in the simple past tense It was a lovely fresh spring in the meadow. You found me easily. Can you find out the sentences in the present progressive tense What are you looking at They are dancing through spring flowers. Can you find out the sentences in the present perfect tense Little Green Worm has grown. I haven’t seen one quite like this before. Can you find out the sentences with modal verbs You must be the best finder. I might be. I can’t see anytihng. Little Green Worm must have been really hungry. Read the following sentences and grammar items. 1. We’re trying _____ _____ the earth. 我们正在尽力地拯救地球。 2. The river _____ _____ be so clean. 河流过去常常是如此干净。 3. The air ____ badly _____. 空气被严重地污染了。 4. No scientific studies _____ ____ that shark fins are good for health. 没有科学研究显示鲨鱼鱼鳍对健康有益处。 5. We _____ _____ save the sharks. 我们应该帮助拯救鲨鱼。 to save used to is polluted have shown should help What tense can you identify(识别) 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 现在进行时的结构和用法(Present progressive) 定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段 正在进行的动作，或说话者的强烈情感。 They are playing basketball now. Tom is working on a new book . 正在发生 目前一段时间内正在进行 It’s always raining here. 说话者的强烈情感（抱怨情绪 Why are you always coming late for class 含说话者的强烈情感 谓语构成：Be(am\is\are) ＋v-ing (动词的现在分词) He is watching a movie now. I am studying Chinese these days. Do you know the usage of the present progressive tense 标志性词汇：now, right now, look, listen, these days, at the moment, at present Look! The boy is crying. Listen! The boy is singing. He is watching a movie now. 具体用法： 1.表示说话时正在进行的，目前正在发生的动作。 常带有表示目前时刻的时间状语如：now, at the (very) moment, for the time being, at present, 及 ... ...
