九下精品教学课件2unit13section a3a4c

1、九年级（下）学练优九年级英语下（学练优九年级英语下（RJRJ） 教学课件教学课件Section A (3a-4c)Unit 13 Were trying to save the earth!学习目标 Key words & phrases: cruel, harmful, be harmful to, industry, law, scientific, take part in, afford, turn off, reusable, pay for, take action Key sentences: 1. Were trying to save the earth. 2. Th

2、e river used to be so clean. 3. No scientific studies have shown that shark fins are good for health. Lead inSave the earth! Save the animals.The zoos provide homes for many endangered animals. 1. Have you ever seen a shark（鲨鱼）（鲨鱼）?2. What do you know about sharks?PresentationWhere shark fin soup is

3、 popularNumber of sharks caughtand traded every yearHow government can helpTwo environmental groups against “finning”southern China70 milliondevelop laws to stop the sale of shark finsWildAid and the WWF3aRead the passage about sharks and complete the fact sheet below.3bRead the passage again and fi

4、ll in the blanks with the words in the box.so although if but when1. Many people do not realize they are killing a whole shark _ they enjoy a bowl of shark fin soup.2. Sharks are at the top of the food chain, _ if their numbers drop, the oceans ecosystem will be in danger.whenso3. Many think that sh

5、arks 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. Sharks may disappear one day _ we do not do something to stop the sale of shark fins.butAlthoughifadj. 科学上的，科学的科学上的，科学的Retell th

6、e passage according to the words below.shark fin soup in southern China each time cut off no longer not onlybut also at the top drop be endangered the strongest around 70 million fallen by over 90 percent WildAid and the WWF develop laws scientific studies Language points1. A shark can no longer swi

7、m and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。鲨鱼不能再游泳然后慢慢死掉。no longer意思是意思是“不再不再” e.g. Im no longer a student. 我不再是个学生了。我不再是个学生了。 有两个短语和有两个短语和no longer同义，即同义，即notany longer和和notany more，但他，但他们侧重的方面不同。们侧重的方面不同。no longer和和notany longer侧重时间。侧重时间。 e.g. He no longer lives here. = He doesnt live here any longer. 他不在这儿

8、居住了。他不在这儿居住了。(一个时间以前他住一个时间以前他住 在这儿，过了这个时间，他就离开了。在这儿，过了这个时间，他就离开了。) notany more侧重程度和数量侧重程度和数量e.g. You can drink no more. = You cant drink any more. 你不能再喝了。你不能再喝了。(喝酒的量到了一定程喝酒的量到了一定程 度，不能再继续下去了。度，不能再继续下去了。) 2. This 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。这种方法不但残忍

9、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，着重用于连接两个表示并列关系的成分，着重强调后者，其意为强调后者，其意为“不仅不仅而且而且”; 其中的其中的also有时可以省略。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。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。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若连接两个成分作

10、主语，其谓语通常与靠近的主语保持一致。保持一致。e.g. Not only you but also he has to leave. 不只是你，他也得离开。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。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.这个可怜的人不这个可怜的人不仅被罚款，而且还被送进了监狱。仅被罚款，而且还被送进了监狱。 be harmful to 对对有害有害e.g. Smoking is harmfu

11、l to the health. 吸烟有害健康。吸烟有害健康。 Playing computer games much is harmful to students.电脑游戏玩太多对学生有害。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。鲨鱼位于海洋生物系统食物链的顶部。at the top of 在在最高地位最高地位; 用最高用最高最大最大的的(速度速度, 声音等声音等) e.g. I looked at the top of his head

12、, his hair shiny and parted smoothly. 我看他的头顶我看他的头顶, 头发闪亮且平滑的分开。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. 他尽力大声叫喊他尽力大声叫喊, 以便别人能听见。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，会给所有海洋生物如果它们的数目降至过低，会给所有海洋生物 带来危险。带来危险。

13、 此句复数形式的此句复数形式的numbers表达全海洋中鲨表达全海洋中鲨 鱼的鱼的总量。当表示数值的高或低时，总量。当表示数值的高或低时，number要用要用high或或low修饰。修饰。e.g. In that country, the number of children going to school is higher in cities than that in towns and villages. 在那个国家，城市儿童入学人数比乡镇在那个国家，城市儿童入学人数比乡镇 及及农村要高。农村要高。 常与常与number搭配的动词有搭配的动词有grow, fall等。等。e.g. The

14、 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。近来拥有轿车的家庭数量增长很快。5. Environmental 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，都在教育公众有关会和世界自然基金会，都在教育公众有关 “猎

15、翅猎翅”的行为。的行为。1) 句中句中fin本为名词，指本为名词，指 “鱼鳍鱼鳍”。此句中的。此句中的 finning由动词化的由动词化的fin（割鲨鱼鳍以获取（割鲨鱼鳍以获取 鱼翅）的鱼翅）的-ing形式转化而成，指课文中所形式转化而成，指课文中所 陈述的陈述的 “猎翅猎翅”这一行为。这一行为。 2) WildAid和和WWF组织组织 WildAid（美国野生救援协会）（美国野生救援协会）是保护野生动物及栖息地环境是保护野生动物及栖息地环境的一个非盈利性的机构，的一个非盈利性的机构，1999年注册成立，其宗旨是保护及年注册成立，其宗旨是保护及救助世界范围内的野生动物；救助世界范围内的野生动物

16、；WWF（世界自然基金会）英（世界自然基金会）英文全称为文全称为World Wide Fund for Nature，成立于，成立于1961年，是享年，是享有国际盛誉，全球最大的独立有国际盛誉，全球最大的独立性非政府环境保护组织之一。性非政府环境保护组织之一。Grammar FocusWere trying to save the earth.Present progressiveThe river used to be so clean.used toThe air is badly polluted.Passive voiceNo scientific studies have shown

17、 that shark fins are good for health.Present perfectWe should help save the sharks. 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 nowe.g. Look! The boy is crying.定义：定义：表示说话时表示说话时(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

18、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, 而现而现 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. 表示习惯于做某事表示习惯于做某事e.g. I used to get up at six oclock. Joe is used to drinking a cup of coffee every morning.used to do与与be used to doingTranslation.1. 她过去常常周末和朋友闲逛。她过

19、去常常周末和朋友闲逛。 She used to hang out with friends on weekends.2. 他习惯于每天晚上熬夜。他习惯于每天晚上熬夜。 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 new school was built last year. Our classroom is cleaned every day.Translate the se

20、ntences 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: has/have + 过去分词过去分词标志词：标志词：already, yet, ever, never, since, fore.g. I havent finished

21、 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一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 PerfectComplete the following sentences.1. I _ (be) in Beijing for two years.2. I _ never _ (hear) of that man before.3. Tom _ (work) there since two yea

22、rs ago.have beenhaveheard has worked4. The twins _ (wash) the clothes for an hour.5. He _ (play) basketball since three years ago.6. How long _ Sally _ (sing) yet?have washedhas playedhassung1. 情态动词本身有一定的词义情态动词本身有一定的词义, 表示说话表示说话人的情绪、态度或语气人的情绪、态度或语气, 但不能单独作但不能单独作谓语谓语, 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

23、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, 后接动词原后接动词原形。否定式是在情态动词后面加形。否定式是在情态动词后面加not。个。个别情态动词有过去式形式别情态动词有过去式形式, 可用来表达更可用来表达更加客气、委婉的语气。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 fi

24、ve 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 classroom. You must finish your homework first. He cant be at home now. She must know the answer to this questio

25、n.4aFill 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 project this city _ ever _ (have).Have takenhelpedconsideredhadhad参加

26、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 is _ (try) to improve the environment.Eric: Yes, we cant afford to _ (wait) any longer to take action!tookthinkcametryingwaitv. 承担得起承担得起( (后果后果) ); 买得起买得起4bFill 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 example, you _ savemay/mightmustcancan would could have to sho