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1、Unit 13,Were trying to save the earth.,Section A 3a-4c,学习目标,Key words & phrases: method，cruel，harmful，industry，law，afford，take part in，turn off，pay for Key sentences: 1. Were trying to save the earth. 2. The river used to be so clean. 3. The air is badly polluted.,新课导入,There are some animals are end
2、angered. We should do something to protect the animals and the environment!,Save the earth!Save the animals!,The zoos provide homes for many endangered animals.,1. Have you ever seen a shark（鲨鱼）?2. What do you know about sharks?,Discuss with your partner:,课文展现,southern China,70 million,develop laws
3、to stop the sale of shark fins,WildAid and the WWF,3a,Read the passage about sharks and complete the fact sheet below.,3b,Read the passage again and fill in the blanks with the words in the box.,Many people do not realize they are killing a whole shark _ they enjoy a bowl of shark fin soup.2. Sharks
4、 are at the top of the food chain, _ if their numbers drop, the oceans ecosystem will be in danger.,when,so,3. Many think that sharks are too strong to be endangered, _ they are wrong.4. _ there are no scientific studies to support this, a lot of people believe that shark fins are good for health.5.
5、 Sharks may disappear one day _ we do not do something to stop the sale of shark fins.,but,Although,if,adj. 科学上的，科学的,Retell the passage according to the words below.,Language points,1. A shark can no longer swim and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。,no longer意思是“不再” e.g. Im no longer a student. 我不再是个学生了。,
6、有两个短语和no longer同义，即notany longer和notany more，但他们侧重的方面不同。,no longer和notany longer侧重时间。 e.g. He no longer lives here. = He doesnt live here any longer. 他不在这儿居住了。(一个时间以前他住 在这儿，过了这个时间，他就离开了。) notany more侧重程度和数量e.g. You can drink no more. = You cant drink any more. 你不能再喝了。(喝酒的量到了一定程 度，不能再继续下去了。),2. This
7、method is not only cruel, but also harmful to the environment. 这种方法不但残忍而且对环境有害。,not onlybut also用于连接两个表示并列关系的成分，着重强调后者，其意为“不仅而且”; 其中的also有时可以省略。,e.g. She not only plays well, but also writes music. 她不但很会演奏，而且还会作曲。 Not only men but also women were chosen. 不仅仅是男的，女的也有被选中的。,若连接两个成分作主语，其谓语通常与靠近的主语保持一致。e
8、.g. Not only you but also he has to leave. 不只是你，他也得离开。,not only放在句首，后接句子时要用倒装结构。 e.g. Not only had the poor man been fined, but also he had been sent to prison. 这个可怜的人不仅被罚款，而且还被 送进了监狱。,be harmful to 对有害e.g. Smoking is harmful to the health. 吸烟有害健康。 Playing computer games much is harmful to students.
9、 电脑游戏玩太多对学生有害。,3. Sharks are at the top of the food chain in the oceans ecosystem. 鲨鱼位于海洋生物系统食物链的顶部。,at the top of 在最高地位; 用最高最大的(速度, 声音等) e.g. I looked at the top of his head, his hair shiny and parted smoothly. 我看他的头顶, 头发闪亮且平滑的分 开。,He shouted at the top of his voice in order that he might be heard.
10、他尽力大声叫喊, 以便别人能听见。,4. If their numbers drop too low, it will bring danger to all ocean life. 如果它们的数目降至过低，会给所有 海洋生物带来危险。 此句复数形式的numbers表达全海洋中鲨 鱼的总量。当表示数值的高或低时，number要用high或low修饰。,e.g. In that country, the number of children going to school is higher in cities than in towns and village. 在那个国家，城市儿童入学人数比
11、乡镇 及农村要高。常与number搭配的动词有grow, fall等。e.g. The number of families that own cars has been growing quickly recently. 近来拥有轿车的家庭数量增长很快。,5. Environment protection groups around the world, such as WildAid and the WWF, are teaching the public about “finning”. 世界各地的环境保护组织，如野生救援协 会和世界自然基金会，都在教育公众有关 “猎翅”的行为。1) 句
12、中fin本为名词，指 “鱼鳍”。此句中的 finning由动词化的fin（割鲨鱼鳍以获取 鱼翅）的-ing形式转化而成，指课文中所 陈述的 “猎翅”这一行为。,2) WildAid和WWF组织 WildAid（美国野生救援协会）是保护野生动物及栖息地环境的一个非盈利性的机构，1999年注册成立，其宗旨是保护及救助世界范围内的野生动物；WWF（世界自然基金会）英文全称为World Wide Fund for Nature，成立于1961年，是享有国际盛誉，全球最大的独立性非政府环境保护组织之一。,Pay attention to the sentences.1. Were trying to s
13、ave 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,现在进行时: Present Progressive,结构: be
14、 (am/is/are) + v.-ing标志词：Look, Listen, now, right nowe.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?,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
15、 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.,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 ye
16、ar. 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.,Exercise,结构: has/have + 过去分词标志词：already, yet, ever, never, since
17、, fore.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 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,
18、has worked,Exercise,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
19、 (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
20、。,Exercise,We cant eat in the classroom.,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 _ (h
21、elp) with a Clean-Up Day last year. It was _ (consider) the biggest clean-up project this city _ ever _ (have).,Have,taken,helped,considered,had,had,参加,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
22、 is _ (try) to improve the environment.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
23、 the earth begins with small things. For example, you _ save,may/might,must,can,can would couldhave to should mustmay/ 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
24、 in some stores. And instead of driving 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/ca
25、n,采取行动,4c,Make a list of things that 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
26、(餐巾纸);recycle books and paper,Discussion,I think that everyone should use public transportation.,I disagree. Its difficult for parents with young children to use public transportation,口头作业 (Oral work) 熟读课文Unit 13 Section A 3a 书面作业 (Writing work) 学练优 Unit 13 Section A 第二课时,Homework,Thank you,everyone!Bye-Bye,
