教案Unit4 Topic 2 When was it invented.doc

Unit4 Topic 2 When was it invented? Section A. Teaching aims and demands 教学目标1. Learn some new words:metal, toothbrush, ink, recorder2. Learn some useful sentences: Whats it made of/from? Its made of/fromWhats it used for?Its used for 3. Learn the simple past passive voice:(1)When was it developed?Around 1998. (2)Where was it developed?It was developed in+-4. Learn how to express hopes and wishes:(1) I wish I could go into space some day.(2) I hope your dream will come true.5. Talk about new technologies and inventions. . Teaching aids 教具火箭模型/牙刷/墨水/纸/录音机/小黑板/MP3/各种发明的图片/魔盒. Teaching procedure:Step 1 Review 师生对话，让学生尽量用被动语态叙述计算机的作用，引出生词rocket并导入新课。T:Boys and girls, weve learned about the importance of computers. Can you tell me something about them in passive voice?S1:Computers are used by doctors to find diseases easily.S2:Robots are controlled by computers to do dangerous work.S3:In business, computers are used to place and cancel orders.S4:Spaceships are mainly controlled by computers.T:Well done! But do you know how the spaceships are sent up from the ground into space?S4:They are sent up by rockets. (帮助学生回答。)(出示火箭模型，板书并帮助学生理解rocket。)rocketT:Look! This is a model rocket. Whats it made of? Whats it used for? Lets come to 1a and talk about it.Step 2 Presentation 第二步 呈现(时间:13分钟)用具体实物设置情景，师生对话，学习生词和新句型。找出关键词句和目标语言，为交际积累材料。1. (师生对话，用实物引出生词，学习新句型。)T:(让学生摸一摸火箭模型) Whats it made of?S1:Its made of “金属”.T:Yes, its made of metal.(板书句型及生词，并让学生掌握。)metalWhats it made of?Its made of metal.T:Do you know what a rocket is used for?Ss:Its used for sending spaceships into space.T:Yes, its used for sending spaceships or satellites into space.(板书句型并要求学生掌握，帮助学生理解satellite。)satelliteWhat is a rocket used for?Its used for sending satellites or spaceships into space.(摸出牙刷。) T: How do you say this in English, S2?S2:Sorry, I dont know.T:OK, it is a toothbrush.(板书toothbrush，领读并要求学生掌握该单词及复数形式。)toothbrush toothbrushes T:(手拿牙刷问)Whats it used for?S2:Its used for brushing teeth.T:Whats it made of, S2?S2:Its made of plastic.T:Very good! Youre right.(摸出一瓶墨水。) Whats this in English, S3?S3:Sorry, I dont know.T:Its a bottle of ink.(板书，领读并要求学生掌握。)ink T:Do you know what it is used for?S3:Its used for writing.(从魔盒中摸出一张纸，做神秘状。)T:How do you say this in English, S4?S4:Its a piece of paper.T:Can you tell me what it is made from? (让其摸一摸，看一看。)S4:Sorry, I cant.T:Let me tell you. It is made from wood. (说的时候语速要慢，重音放在from。)(引导学生总结be made of与be made from的区别。板书并解释。)be made of + 材料：表示原材料容易被看出。be made from + 材料：表示原材料经过化学变化，不易被看出。2. (让学生不要打开课本，听1a，回答下列问题，听后核对答案。)T:Dont open your books. Listen to the tape carefully and try to find out the answers to the questions.(出示小黑板。)(1)Why is Jane unhappy?(2)Who made the model rocket?(3)What is a rocket used for? (核对答案。)3. (让学生打开课本，找出疑难句。教师出示小黑板。)Im not allowed to play computer games.Its made of metal.Its used for sendingintoI wish I could go into space some day.(解释此句使用了虚拟语气，在此只要求了解。)I hope your dream will come true.Step 3 Consolidation 第三步 巩固(时间:8分钟)巩固1a及be made of/from, be used for的用法。完成1b。1. (让学生打开课本，再听1a录音，学生跟读，感受纯正的语音语调。) T: Open the books, listen to the tape and read after it. Pay attention to the pronunciation and intonation.2. (让学生找出对话中的关键词，教师板书。然后让学生根据关键词两人对话复述1a。)T: Boys and girls, lets find out the key words together, OK?(板书)Janeunhappy / be not allowed to / be bad forKangkanga model rocket / be made of metalbe used for / satellites or spaceships / learn from/ wish/ hope/ come true3. (让学生认真阅读1b中的例子，然后让他们仿照例子用实物编对话，完成1b。)T:In 1b, we can see two dialogs. Read them carefully and pay attention to the sentence patterns, “be made of”, “be made from” and “be used for”. Make similar conversations in pairs.Step 4 Practice 第四步 练习(时间:13分钟)由一般现在时的被动语态，引出一般过去时的被动语态并加以操练。引出2a的内容，展开任务型活动，让学生掌握目标语言。完成2b。1. (继续操练be made of/from及be used for的用法。)T:(老师手指录音机问。) Boys and girls, whats this in English?Ss:We dont know.T:Its a recorder.(板书生词并让学生掌握。)recorderT:Whats it used for?Ss:Its used for helping us to improve our English. (引导学生回答。)T:Yes, what is this? (从魔盒里拿出MP3。)Ss:Its an MP3 player.T:Yes, it was developed in Korea. Its more useful than a recorder.(板书画线句子让学生观察，并与一般现在时的被动语态相比较，帮助学生总结出一般过去时被动语态的构成并举例作适当讲解。)was/were+及物动词的过去分词It was developed in Korea.The bridge was built in 1990.The cup was used in old days.T:(手拿MP3问。) When was it developed? And whats it used for? Lets listen to 2a.2. (放录音，听后核对答案。)T:S1, answer the questions, please!S1:The MP3 player was developed around 1998. Its used for helping us to improve our English. Its more useful than a recorder.3. (让学生阅读2a对话，找出关键词，为下一步活动做准备。) T: Read 2a, and underline the key words.(板书关键词。)an MP3 player, be used for,help us to improve our English, develop,around 1998, Korea, more useful, recorder, buy4. (指导学生利用黑板上的关键词复述2a对话，巩固一般过去时被动语态的句型。完成2a。)T:Who would like to retell 2a? S2, please!S2:Kangkang is listening to MP3. Its very nice. Its used for helping us to improve our English. It was developed in Korea around 1998. Its more useful than a recorder.T:Very good!5. (指导学生完成2b。师生互动，提高学生口语表达能力。)Example:T:How do you say it in English?Ss:Digital camera. (帮助学生回答。)(板书digital，要求学生理解。)digitalT:When was it developed?Ss:It was developed in 1975. T:Where was it developed?Ss:It was developed in America. T:Whats it used for?Ss:Its used for taking photos. T:Do you understand? Practice the dialogs with your partner. Lets begin. Step 5 Project 第五步 综合探究活动(时间:5分钟)利用各种发明的图片操练一般过去时的被动语态，让学生在探究中锻炼语言综合运用能力。1. (收集各种发明的图片，如传真机、汽车、火车等，学生可以在谈论自己感兴趣的发明中不断地使用was developed in / be made of / be used for这些目标语言。)2. Homework:T: Please write down a short passage about your favorite invention in