人教版九年级英语Unit13_We’re_trying_to_save_the_earth!第3课时课件.SectionA(Grammar_Focus-4c.)ppt.ppt

Unit13 We’re trying to save the earth! 第3课时课件Section A (Grammar Focus ---4c) The earth is badly polluted. What should we do to save the earth? Pay attention to the sentences. 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 Modal verbs 现在进行时: Present Progressive 结构: be (am/is/are) + v.-ing 标志词：Look, Listen, now, right now… e.g. Look! The boy is crying. 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。 What a fine day today! Look! What are they doing? 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。 be used to doing sth. 表示习惯于做某事 e.g. I used to get up at six o’clock. Joe is used to drinking a cup of coffee every morning. used to do与be used to doing Translation. 1. 她过去常常周末和朋友闲逛。 She used to hang out with friends on weekends. 2. 他习惯于每天晚上睡得很晚。 He is used to staying up. 被动语态：Passive voice 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 e.g. A new school was built last year. Our classroom is cleaned every day. Translate the sentences by using Passive voice. 1. 刚才一些老年人参观了博物馆。 2. 工人们使用不同种类的机器工作。 The museum was visited by some old people just now. Different kinds of machines are used to work by the workers. 结构: has/have + 过去分词 标志词：already, yet, ever, never, since, or… e.g. I haven’t finished my homework yet. 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。 现在完成时: Present Perfect Complete the following sentences. I _________ (be) in Beijing for two years. 2. I _____ never _____ (hear) of that man before. 3. Tom __________ (work) there since two years ago. have been have heard has worked 4. The twins ___________ (wash) the clothes for an hour. 5. He _________ (play) basketball since three years ago. 6. How long ____ Sally _____ (sing) yet? have washed has played has sung 1. 情态动词本