2020-2021学年北师大版英语八年级下册Unit2Lesson4AnimalTalk课件(1)

Lesson 4 Animal Talk Unit 2 Communication Objectives: Be able to read!1 Be able to listen!2 Be able to communicate! 3 Be able to understand! 4 Warm-up Think of animals you know. How do they communicate? Example I think ants communicate by smell. 1.Read the text. What are the three main methods of animal communication? 2.Read the text again. What methods do these animals use to communicate? Ants elephants dogs frogs Cats whales mice insects My dog is in the garden. He is wagging his tail, his mouth is open and he is looking at me. What is he trying to tell me? Jane Roberts reports. People have always been interested in animal communication and scientists have done a lot of research on this subject. Most animals communicate by smell. Dogs are famous for this. When a dog walks outside, it learns about other dogs by smelling things. Dogs have helped police for a long time, too. They can find missing people by using their fantastic sense of smell. Mice have an excellent sense of smell, too. Scientists have even trained them to find landmines. Scientists have discovered that even ants use smell. They use smell to tell other ants where the food is. Everyone has heard birds singing. Research has shown that many other animals use sound to communicate. Frogs and inserts communicate with sounds. Usually the “gentlemen” make sounds to invite the “ladies”. Whales and elephants also use sound to communicate. These sounds can travel very far through water or the ground. However, it is not possible for humans to hear some of the sounds. They are either too low or too high for us. Animals have always used body language to communicate as well. When a cat puts its ears back, it is a bit mad. When it was sits with its tail around itself, it is happy. When a dog puts its tail under its body, it is scared. When it wages its tail and opens its mouth, it is happy. So I think my dog is happy right now. 1.Read the text. What are the three main methods of animal communication? Smell, sound and body language. 2.Read the text again. What methods do these animals use to communicate? Smell: ants, dogs, mice Sound: elephants, whales, frogs, insects Body language: Cats, dogs 狗也协助警察很长时间了。通过利用他们 卓越的嗅觉，他们可以失踪的人们。老鼠 也有很杰出的嗅觉。科学家们训练它以寻 找 。科学家们还发现甚至是蚂蚁也利用 嗅觉。他们利用嗅觉告诉其他蚂蚁食物在 哪。 每个人都听过鸟唱歌。研究表示多数鸟类 通过声音来沟通。青蛙和昆虫通过声音沟 通，通常雄性通过声音来吸引异性。 鲸和大象也通过声音来交流。声音可以穿 过水和陆地传播的非常远。然而，人类是 不可能听到一些声音的。对于人类来说它 们要不太高要不太低了。 动物通常还通过肢体语言来交流。当一只 猫吧耳朵背到后面，它就是有点生气了。 当它坐着用自己尾巴绕着身体摆动时，它 很高兴。当狗打他的尾巴压在身体下面时， 它很害怕。当它摆动尾巴，张开嘴时，它 很高兴。所以我认为我的狗正高兴呢。 Listen to the tape, and check your answer from above. Then read aloud the text! Grammar Part! 现在完成式(Then Present Perfect Tense) 1. 现在完成时表示过去发生或已经完 成的某一动作对现在造成的影响或结 果。(汉语中常用“已经”、“过”、“了” 等表达）通常与表示包括现在在内的 时间副词 just，already, before, yet, never, ever 等状语连用。例如： ① I have never heard of that before. ② Have you ever ridden a horse? ③ She has already finished the work. 现在完成式(Then Present Perfect Tense) 构成:现在完成时由“have/has+ 动词的过 去分词”构成。现在完成时的肯定式、 否定式和疑问式及简单回答形式（以动 词study为例）： 肯定式：I （You）have studied. He(She, It) has studied. We(You/They) have studied. 否定式I(You) have not/haven’t studied. He(She/It)has not/hasn’t studied. 现在完成式(Then Present Perfect Tense) We(You/They) have not/ haven’t studied. 疑问式：Have I( you ) studied? Yes, you (I) have./ No, you (I) haven’t. Has he (she/it) studied?  Yes, he(she/it) has.／No, he(she/it) hasn’t. Have we(you/they) studied? Yes, you (we/they) have. No, you (we/they) haven’t. 现在完成式(Then Present Perfect Tense) 2.现在完成时表示过去已经开始，持续 到现在,也许还会持续下去的动作或状 态。可以和表示延续的时间状语连用。 如for、since 等引导的时间状语。（注 意：句中谓语动词要用延续性动词） 现在完成式(Then Present Perfect Tense) for: +一段时间 （for a year for two weeks for three years） 过去的某一时刻, since nine since last week since 一般过去时态的时间状语从句 since you came since you got home. Speaking Part！ Do you have any pets? Have you ever watched an animal? How do they communicate? Talk to your partner. Speaking Part！ Example A: I don’t have any pets, but I’ve seen animals on TV. Some monkeys make loud noise to communicate with other monkeys. B: How? A: When they see a lion, they make loud noise. Then all the monkey hide. Make conversations with your partners! 与你的同伴练习以上对话！ ( )1.You’ve never seen such a wonderful film before, _______? A. haven’t you B. have you C. do you D. don’t you ( ) 2. —I have watched the game. —When ____ you ____ it? A. have; watched B. do; watch C. did ;watch D. will; watch B C ( )3. Mr. Green ____ in China since five years ago. A. lived B. has lived C. lives D. is going to live ( )4. His grandma ______ for two years. A. died B. has died C. was dead D. has been dead B D 请课后认真复习本单元语法内容， 并朗诵课文对话！ That’s all!