人教版英语九年级下册课件Unit 13 Section A (3a-4c).pptVIP

初中英语精品资源 结构: has/have + 过去分词 标志词：already, yet, ever, never, since, for… e.g. I haven’t 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 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 Section A (3a-4c) Unit 13 We’re 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. A shark can no longer swim and slowly dies. 2. This is not only cruel, but also harmful to the environment. 3. No scientific studies have shown that shark fins are good for health. Lead in 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? Presentation Where shark fin soup is popular Number of sharks caught and traded every year How governments can help Two environmental groups against “finning” southern China 70 million develop laws 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. so although if but when 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 ocean’s ecosystem will be in danger. when so 3. Many think that sharks are too strong to b