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1、Unit13 Were 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?,Warming up,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 st
2、udies 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,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(
3、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?,Exercise,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 oclock. Joe is used to drinking a cup of coffee every morning.,used to do与be used to doing,Translation. 1
4、. 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.,Exercise,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.
5、 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.,Exercise,结构: has/have + 过去分词 标志词：already, yet, ever, never, since, or e.g. I havent 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
6、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,Exercise,4. The twins _ (wash) the clothes for an hour. 5. He _ (play)
7、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,2. 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
8、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。 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。,Exercise,We cant eat in the classroom.,You must finish your homework first.
9、,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 year. It was _ (consider) the biggest clean-up
10、 project this city _ ever _ (have).,Have,taken,helped,considered,had,had,参加,辨析：join, join in 和take part in,to,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.
11、Eric: Yes, we cant afford to _ (wait) any longer to take action!,took,think,came,trying,wait,v. 承担得起(后果); 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. F
12、or example, 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 driv
13、ing to school 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,adj.可重复使用的,付费;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,4c,Make a list of things that
14、 people can do to help the environment and discuss your list with your partner.,use public transportation (n.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); recycle books and paper ,Discussing.,4c,Homework,Write 5 measures to protect the environment.,
