3 Unit 13 Grammar -【学海风暴】2023-2024学年九年级下册英语（人教版）

Unit 13 Grammar 授课人：*** 九年级英语人教版·下册 1 Look! What are they doing? They are having fun. 一、新课引入 1. We’re trying to save the earth. 2. The river used to be so clean. 3. The air is badly polluted. 4. No scientific studies have shown that shark fins are good for health. 5. We should help save the sharks. Present progressive used to Passive voice Present perfect Grammar Focus Modal verbs 一、新课引入 1. We’re trying to save the earth. 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。 结构: be (am/is/are) + v.-ing 标志词：look, listen, now, It is +具体时刻, 祈使句, 上下文 二、新课讲解 2. The river used to be so clean. 【拓展】be/get used to (doing) sth. 表示习惯于(做)某事。 【点拨】used to do sth. 表示过去常常做某事, 而现在往往不做了, 后接动词原形。 二、新课讲解 3. The air is badly polluted. 定义：表示主语是动作的承受者，即行 为动作的对象的一种语态。 结构：be + 过去分词（am/ is/ are+过去分词；was/ were+过去分词；情态动词+be+过去分词） 二、新课讲解 4. No scientific studies have shown that shark fins are good for health. 定义：表示动作已经完成, 但对现在造成影响; 或者表示从过去某一时间开始一直延续 到现在并还可能持续下去的动作。 结构：has/have + 过去分词 标志词：already, yet, ever, never, since, for… 二、新课讲解 5. We should help save the sharks. 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。 二、新课讲解 5. We should help save the sharks. 【点拨】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。 二、新课讲解 现在进行时 一般现在时 被动语态 现在完成时 情态动词的用法 三、归纳小结 1. I _________ (be) in Beijing for two years. 2. I _____ never _____ (hear) of that man before. 3. Tom __________ (work) there since two years ago. 4. The clothes ___________ (wash) just now. 5. He used_______ (play) a lot, but now he likes studying. 6. —Where is Tom? —He _________ (play) basketball on the playground. have been have heard has worked were washed to play is playing 四、强化训练 整理出与 turn相关的短语。 五、布置作业 整理与 turn相关的短语。 turn around 转身 turn up 调高(音量) turn down 调低; 拒绝 turn into 变成; 进入 turn on 打开, 发动 turn off 关掉, 关闭 turn out to be 结果是 turn over 移交 五、布置作业 $$Unit 13 We're trying to save the eart