1、Were trying to save the earth!,Unit 13,Period2 SectionA3a-4c,sharkes,SHARK,鲨鱼早在恐龙出现前三亿年前就已经存在地球上，至今已超过四亿年，它们在近一亿年来几乎没有改变。鲨鱼是海洋中的庞然大物，所以号称“海中霸王”。,shark fin,Mayby you like it,Do you know?,中国目前是世界第一大鱼翅进口国，随着中国民众生活水平的提高，鱼翅已不再是少数人特享，而鱼翅被水银(mercury )污染的程度高达百分之七十，而且食用鱼翅正使全球鲨鱼种群遭遇绝灭之灾。渔民在捕捞上一条鲨鱼后不论大小，都会在甲板上
2、用电锯活生生地把鲨鱼的背鳍(dorsal fin )、两个胸鳍(pectoral fin )和一部分尾鳍(tail fin)割掉，然后将全身血流不止的鲨鱼扔回海中 .,它们最后在饥饿和伤痛中悲惨地死去,因为鱼翅的价格甚高，近年吸引各地渔民争相在海中捕杀鲨鱼，引致海中生态出现不平衡，导致部分鲨鱼濒危。由此导致鲨鱼总数大幅减少50年来下降了80%。据估计，每年全球有1百万鲨鱼被捕杀，鱼翅的年产值达到12亿美金。消费者消费鱼翅的心理动机主要是“为了显示个人的品位或身份”、“高档次的鱼翅能给个人的事业或健康带来帮助”。,真相！吃鲨鱼肉、鱼翅会对人体有很大伤害！,据中国海洋大学的鲨鱼鱼翅营养学报告和香港
3、大学的危险的鱼翅汤中相关数据显示，从现代营养学的角度看，鱼翅并不含有任何人体健康有益或高价值的营养，鱼翅汤的美味主要来自它的配料，而并非鱼翅本身。该调查报告还显示出，鱼翅这种高档营养品被重金属毒素水银污染的程度很高，含有可被人体吸收的水银比率已超出正常允许含量的几十倍。因此，多吃鲨鱼肉、鱼翅都可能会对人体有很大伤害。,艾米护鲨俱乐部 2011Amys Shark Protection Club,保护鲨鱼 拒食鱼翅,没有买卖 就没有杀害,Save the sharks!,3a Discuss the questions with a partner. 1. Have you ever seen
4、a shark? 2. What do you know about sharks?,3b Read the passage. Complete the fact sheet below.,In southern China.,Around 70 million sharks,Over 90 percent,They are WildAid and the WWF.,3c Read the passage and fill in the blanks with the words in the box.,So although if but when,Many people do not re
5、alize they are killing a whole Shark_ they enjoy a bowl of sharks fin soup.,2. Sharks are at the top of the food chain,_if their numbers drop, the oceans ecosystem will be in danger.3. Many think that sharks are too strong to be endangered,_theyre wrong.,when,so,but,4._there are no scientific studie
6、s to support this, a lot of people believe that sharks fins are good for health. 5. Sharks may disappear one day_we do not do something to stop the sale of sharks fins.,Although,if,4a Fill in the blanks with the correct forms of the verbs in brackets.,Interviewer:_you ever_(take) part in an environm
7、ental project? Ken:Yes, I have. I_(help) with a Clean-Up Day last year. It was_(consider) the biggest clean-up project this city_ever_(have). Interviewer: How many people_ (take) part?,Have,taken,helped,considered,had,had,took,Ken:I_(think) more than 1,000 people _(come) to help out. Interviewer: Th
8、ats fantastic! I guess everyone in this city is_(try) to improve the environment.Ken:Yes, everyone should_(play) a part in keeping the city clean.,think,came,trying,play,4b Fill in the blanks with the appropriate modal verbs from the box.,can would could have to should must may/might,When it comes t
9、o saving the earth, people_think that big things_be done. However, many forget that saving the earth begins with small things. For example, you_save electricity by turning off the lights when you leave a room. You_also use,paper or reusable bags instead of plastic bags. In some stores, you now_ pay
10、for plastic bags. I think this is a great idea. And instead of driving to school or work, you_ride your bike or walk. If its far, you_take the bus. All these small things_add up and become big things that_improve the environment.We cannot afford to wait any longer before taking action!,Review of Ten
11、ses,Present Progressive Present Simple “used to” + infinitivePresent PerfectPast progressiveFuture simplePassive Voice Model verbs,What a fine day today! Look! What are they doing?,Lily,Lucy,1.现在进行时: Present Progressive,概念: 表示现在正在发生的动作 结构: be (is, am, are) + doing 标志语： Look! 、 Listen! 、now,动词-ing形式的
12、构成,The twins _(wash) the clothes now. 2. Look! He _ (play) basketball over there. 3. Listen! _ Sally _(sing)?,are washing,is playing,Is,singing,Exercise,2. How often do you ? (once a week, twice, never),I have a friend. His / Her name is. He / She plays.,一般现在时: Present Simple 概念: 表示习惯、经常性的动作 结构: do、
13、 does 标志语：usually、often、never、 sometimes、once a week、 twice a month、every year,They _(wash) the clothes every day. 2. Sometimes he _ (play) basketball over there. 3. How often _ Sally _(sing)?,washes,plays,Exercise,does,sing,- What did you do last Sunday morning? - I went to.,3. 一般过去时,Last Sunday mo
14、rning, my friend. In the afternoon, he/she. And at night, he/she,一般过去时: Past Simple 概念: 表示过去发生的动作 结构: did 标志语：yesterday、. ago、in 1992、 last week/month,动词-ed形式的构成：,- Have you packed yet? - Yes, I have packed .No, I havent ,4. 现在完成时,现在完成时: Present Perfect 概念: 表示已经发生的动作 结构: has done、 have done 标志语：alre
15、ady、 yet、ever、 never、since、for,不规则过去分词,不规则过去分词,5. 过去进行时: Past Progressive概念: 表示过去正在发生的动作结构: be (was，were) + doing标志语：at 8:00 yesterday 、 when、 while、,6. 一般将来时: Future Simple 概念: 表示将要发生的动作 结构: will do、 shall do、 be (is/am/are) going to do 标志语：tomorrow、in、next,概念: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 + 动词
16、过去分词 e.g. In 1972, it was discovered that they were endangeredOur classroom is cleaned every day,7. Passive voice,1.can, could (1)表示能力，“能，会” Can you play basketball? (2)表示怀疑、猜测，常用于否定句和疑问句中 He cant be in classroom. (3)表示请求或允许，口语，“可以”相当may You can go now.,用法,(4)could 是can的过去式，可以表示过去的能力 I could swim wh
17、en I was seven years old. (5)can开头的一般疑问句 以can和cant回答could开头的一般疑问句 以could和couldnt回答,2.may (1)表推测， “也许，可能”用于肯定句 He may come tomorrow. (2)表请求、许可“可以” May I borrow your book? 否定回答时用“mustnt” (3)表示祝愿 May you success. Can 和could都可以用来征求意见或允许，可互换使用,3.must (1)“必须 应该” (2)表推测“一定” (3)表推测时，肯定句中:must否定句：can、may疑问句：
18、can May not：“可能不” Cant：“不可能”,(4)否定句中，mustnt表示禁止，“不允许” Must开头的疑问句，肯定回答用must，否定回答用neednt（=dont have to） “不需要，不必”,4.need （1）need + to do ：need为实义动词，用助动词提问或否定 （2）need + doing：表被动意义 （3）need + do ：need为情态动词，用need提问或回答，肯定回答用need，否定回答用neednt,5.had better “had better+动词原形”：最好做某事，否定形式用：had better not do,6.sha
19、ll (should),will (would) (1)shall用于第一人称征求意见、询问。 (2)should常用来表示义务、责任 We should obey traffic laws. (3)will 用于第二人称表示询问，请求，可也以表达现在的“意愿” Will you pass me the book ？ We will do anything for you.,(4)would用于表示过去的意愿或委婉提问 Would you tell me the way to the station?,区分,1.can 和 be able to 表示能力时用法相同 Can：一般现在时、一般过去
20、时（could） Be able to：现在时、过去时、将来时 Jim couldnt speak Chinese last year , but now he can. We will be able to come back next week.,2.can 和may 表示可能性时的区别 (1)肯定句中用may 表示可能 You had better ask the policeman. He may know. (2)否定句中，语气肯定，“不可能”用cant 语气不肯定，“可能不”用may not,3.would, should, could, might等过去式有时不表示过去，而是表示
21、更委婉的语气,4.must, have (has) to 都是“必须”的意思，常可互换使用，但,have (has) to 是用于强调客观需要，“必须，不得不” Must用于强调主观看法，“必须，应该”,5.maybe 和 may bemay 情态动词，后面+动词原形be ，用在句中maybe 副词 ，“大概，也许”相当于perhaps， 用于句首,6.cant 和 mustnt 否定推测：cant “不可能” mustnt “禁止，不允许”，不能用于推测 must肯定句中表推测，“一定”,The twins _ (wash) the clothes for an hour. He _ (pl
22、ay) basketball since three years ago. How long _ Sally _(sing) yet?,have washed,has played,Exercise,has,sung,I usually _ up at 6:00,but yesterday I_up at 7:00, and tomorrow I _(get) up at 6:30. 2. Listen! Someone _(knock)at the door. 3. I _(be) in Beijing for two years. 4. How often _Andy_ (surf) th
23、e Internet?,get,got,will get,is knocking,have been,does,Exercise,surf,5. He fell asleep while he _(read) a book. 6. I_never_（hear) of that man before. 7. My brother often _(go) for walks last summer. 8. _the story _(happen) in London in 1940?,was reading,have,went,heard,Did,happen,9. What _he _ (do)
24、 when his mother opened the door? 10. If it _(not rain) tomorrow,they _(go) fishing. 11. _ Kates sisters _(play) the piano every Sunday? 12. They _(not call) you the day after tomorrow. 14. Tom _(work) there since two years ago.,was,doesnt rain,will go,Do,wont call,doing,play,has worked,结束语,Nothing is too difficult if you put your heart into it. 世上无难事，只怕有心人。,