北师大版英语八年级下册 Unit 2 Lesson 4 Animal Talk 课件（30张PPT）.ppt

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1、Lesson 4Lesson 4 Animal Talk Animal TalkUnit 2Unit 2Communication Communication Objectives:Be able to read!1Be able to listen!2Be able to communicate!3Be able to understand!4Warm-upThink of animals you know.How do they communicate?ExampleI think ants communicate by smell.1.Read the text.What are the

2、 three main methods of animal communication?2.Read the text again.What methods do these animals use to communicate?Ants elephants dogs frogsCats whales mice insectsMy 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 repor

3、ts.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

4、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.Resea

5、rch 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

6、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.W

7、hen 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

8、,whales,frogs,insectsBody language:Cats,dogs狗也协助警察很长时间了。通过利用他们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也有很杰出的嗅觉。科学家们训练它以寻找找 。科学家们还发现甚至是蚂蚁也利用嗅。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。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过声音来沟通。青蛙和昆虫通过声音沟通

9、，通常雄性通过声音来吸引异性。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。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。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，很高兴。当狗打他的尾巴压

10、在身体下面时，它很害怕。当它摆动尾巴，张开嘴时，它它很害怕。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。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!Grammar Part!现在完成式(Then Present Perfect Tense)1.现现在完成在完成时时表示表示过过去去发发生或已生或已经经完完成的某一成的某一动动作作对现对现在造成的影响或在造成的影响或结结果。果。(汉语汉语中常用中常用“已已经经”、“

11、过过”、“了了”等表达）通常与表示包括等表达）通常与表示包括现现在在内的在在内的时间时间副副词词 just，already,before,yet,never,ever 等状等状语连语连用。例如：用。例如：I have never heard of that before.Have you ever ridden a horse?She has already finished the work.现在完成式(Then Present Perfect Tense)构成构成:现现在完成在完成时时由由“have/has+动词动词的的过过去分去分词词”构成。构成。现现在完成在完成时时的肯定式、否的肯定式

12、、否定式和疑定式和疑问问式及式及简单简单回答形式（以回答形式（以动词动词study为为例）：例）：肯定式：肯定式：I（You）havestudied.He(She,It)has studied.We(You/They)have studied.否定式否定式I(You)have not/havent studied.He(She/It)has not/hasnt studied.现在完成式(Then Present Perfect Tense)We(You/They)have not/havent studied.疑问式：Have I(you)studied?Yes,you(I)have./No

13、,you(I)havent.Has he(she/it)studied?Yes,he(she/it)has.No,he(she/it)hasnt.Have we(you/they)studied?Yes,you(we/they)have.No,you(we/they)havent.现在完成式(Then Present Perfect Tense)2.现现在完成在完成时时表示表示过过去已去已经经开始，持开始，持续续到到现现在在,也也许还许还会持会持续续下去的下去的动动作或状作或状态态。可以和表示延。可以和表示延续续的的时间时间状状语连语连用。用。如如for、since 等引等引导导的的时间时间状

14、状语语。（注。（注意：句中意：句中谓语动词谓语动词要用延要用延续续性性动词动词）现在完成式(Then Present Perfect Tense)for:+一段一段时间时间（for a year for two weeks for three years）过去的某一时刻过去的某一时刻,since nine since last weeksince 一般过去时态的时间状语从句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 anim

15、al?How do they communicate?Talk to your partner.Speaking Part！Example A:I dont have any pets,but Ive 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

16、伴练习以上对话！()1.Youve never seen such a wonderful film before,_?A.havent you B.have you C.do you D.dont you()2.I have watched the game.When _ you _ it?A.have;watched B.do;watch C.did;watch D.will;watchBC()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 BD请课后认真复习本单元语法内容，并朗诵课文对话！THANKSThats all!Thats all!