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.

1、Unit13 Were trying to save the earth! 第第3课时课件课时课件Section A (Grammar Focus -4c) The earth is badly polluted. What should we do to save the earth? Pay attention to the sentences. 1. Were trying to save the earth. 2. The river used to be so clean. 3. The air is badly polluted. 4. No scientific studies

2、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 现在进行时现在进行时: : Present Progressive 结构结构: be (am/is/are) + v.-ing 标志词：标志词：Look, Listen, now, right now e.g. Look! The boy is crying. 定义：定义：表示说话时表示说话时

3、(瞬间瞬间)正在进行正在进行 的动作的动作, 也表示目前或现阶也表示目前或现阶 段正在进行的动作。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表示过去常常做某事, 而而 现现 在往往不做了在往往不做了, 后接动词原形。后接动词原形。 be used to doing sth. 表示习惯于做某表示习惯于做某 事事 e.g. I used to get up at six oclock. Joe is used to drinking a cup of coffee eve

4、ry morning. used to do与与be used to doing Translation. 1. 她过去常常周末和朋友闲逛。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。他习惯于每天晚上睡得很晚。 He is used to staying up. 被动语态：被动语态：Passive voice 定义：定义：表示主语是动作的承受者，即行表示主语是动作的承受者，即行 为动作的对象的一种语态。为动作的对象的一种语态。 结构：结构：be + 过去分词过去分词 e.g. A ne

5、w 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。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。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. 结构结构: h

6、as/have + 过去分词过去分词 标志词：标志词：already, yet, ever, never, since, or e.g. I havent finished my homework yet. 定义：定义：表示动作已经完成表示动作已经完成, 但对现在造成影但对现在造成影 响响; 或者表示从过去某一时间开始或者表示从过去某一时间开始 一一 直延续到现在并还可能持续下去的直延续到现在并还可能持续下去的 动作。动作。 现在完成时现在完成时: Present Perfect Complete the following sentences. I _ (be) in Beijing for

7、 two years. 2. I _ never _ (hear) of that man before. 3. Tom _ (work) there since two years ago. have been haveheard 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. 情态动词本身有

8、一定的词义情态动词本身有一定的词义, 表示说表示说 话人的情绪、态度或语气话人的情绪、态度或语气, 但不能单但不能单 独作谓语独作谓语, 只能与其他动词构成谓语。只能与其他动词构成谓语。 常见的有常见的有: can (could), may (might), must, need, shall (should), will (would)等。等。 情态动词情态动词 2. 情态动词无人称和数的变化情态动词无人称和数的变化, 后接动词后接动词 原形。否定式是在情态动词后面加原形。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个别情态动词有过去式形式, 可用来表可用来表 达更加客气、委婉

9、的语气。达更加客气、委婉的语气。 e.g. Ken can climb up the tress like a koala. Tracy could ride a bicycle when she was five years old. You mustnt play with fire. It is dangerous. Translation. 1. 我们不能在教室里吃东西。我们不能在教室里吃东西。 2. 首先你必须完成作业。首先你必须完成作业。 3. 他现在不可能在家。他现在不可能在家。 4. 她一定知道这个问题的答案。她一定知道这个问题的答案。 We cant eat in the c

10、lassroom. You must finish your homework first. He cant 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 ? Eric: Yes, I have. I _ (help) with a Clean-Up Day last

11、year. It was _ (consider) the biggest clean-up project this city _ ever _ (have). Have taken helped considered had had 参加参加 辨析：辨析：join, join in 和和take part in to join 加入组织，团体，党派等，有加入组织，团体，党派等，有 作为其中的一个成员的含义作为其中的一个成员的含义; 后面也可以加表示人的名词，后面也可以加表示人的名词， 表示和某人一起参加某活动表示和某人一起参加某活动 join in 加入一种具体活动。加入一种具体活动。 t

12、ake aprt in 指参加会议或群众性活动等，指参加会议或群众性活动等， 着重说明句子主语参加该项活着重说明句子主语参加该项活 动并在活动中发挥作用。动并在活动中发挥作用。 Joe: How many people _ (take) part? Eric: I _ (think) more than 1,000 people _ (come) to help out. Joe: Thats fantastic! I guess everyone in this city is _ (try) to improve the environment. Eric: Yes, we cant af

13、ford to _ (wait) any longer to take action! took think came trying wait v. 承担得起承担得起( (后果后果) ); 买得起买得起 4b Fill in the blanks with the appropriate modal verbs from the box. People _ think that big things _ be done to save the earth. Many forget that saving the earth begins with small things. For examp

14、le, you _ save may/might must can can would could have to should must may/ might electricity by turning off the lights when you leave a room. You _ also use reusable bags instead of plastic bags. I think its a great idea that you now _ pay for plastic bags in some stores. And instead of driving to s

15、chool or work, you _ ride your bike or walk. If its far, you _ take the bus. All these could have to can/should can/could 关掉关掉adj.可重复使用可重复使用 的的 付费付费;付出代价付出代价 small things _ add up and become big things that _ improve the environment. Lets take action now! could would/can 采取行动采取行动 4c Make a list of t

16、hings that people can do to help the environment and discuss your list with your partner. use public transportation (n.交通运输交通运输); turn off the lights when you leave a room; use reusable bags instead of plastic bags; ride your bike or walk to school or work; stop using paper napkins(餐巾纸餐巾纸); recycle books