Unit 13 第3课时 Section AGrammar Focus－4c-（教学课件）2022春【鸿鹄志·名师测控】九年级下册初三英语（人教版）

人教版·九年级下册 英语 Unit 13　We're trying to save the earth! Section A Grammar Focus－4c 情景导入 Have you ever taken part in an environmental project? What should you do to save the environment? We can…… ①turn off the lights when… ②use the paper bags ③walk to school… 生成新知 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 时态 定义 构成 常见标志词 现在进行时 现在完成时 被动语态 表示现在或现阶段正在发生或进行的动作 表示过去发生的动作对现在产生的影响或结果 主语是谓语动作的承受者 am / is/ are+动词-ing形式 have / has +动词过去分词 be + 动词过去分词 now, at the moment(此刻), look, listen already, just或yet Fill in the blanks. 1. 听！一些女孩正在教室里唱歌。 Listen. Some girls ___________ in the classroom. 2. 他们已经打扫了教室。 They ______ already _______ the classroom. are singing have cleaned 3. 这儿的人不说英语。 English ______ ________ by people here. 4. 我曾去过那个国家。 I ______ ever ______ to that country. isn’t spoken have been 情态动词本身有一定的词义, 表示说话人的情绪、 态度或语气, 但不能单独作谓语, 只能与其他动 词构成谓语。常见的有: can (could), may (might), must, need, shall (should), will (would)等。 情态动词 情态动词无人称和数的变化，后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式，可用来表达更加客气、委婉的语气。 Ken can climb up the trees like a koala. Tracy could ride a bicycle when she was five years old. You mustn’t play with fire. It is dangerous. Translation. 1. 我们不能在教室里吃东西。 2. 首先你必须完成作业。 3. 他现在不可能在家。 4. 她一定知道这个问题的答案。 We can’t eat in the classroom.  You must finish your homework first. He can’t be at home now.  She must know the answer to this question. 4a Fill in the blanks with the correct forms of the verbs in brackets. Joe: ______ you ever ______ (take) part in an environmental project? Ken: Yes, I have. I _______ (help) with a Clean-Up Day last year. It was __________ (consider) the biggest clean-up project this city ____ ever ____ (have). Joe: How many people _____ (take) part? Have taken help