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1、Unit 4 When was it invented?单元备课【学习内容】Unit 4 When was it invented ? 【学情分析】本节课是第四单元, 学习任务是完成课文Grammar Focus, 3a, 3b and 4 部分的学习。本单元要求学会谈论重要发明的历史及用途，然后针对各项发明的用处及特点，发表自己的看法，并说明理由。话题一直是围绕着历史上和日常生活中的重要发明，通过使用“Passive Voice”形式的句型，循序渐进地展开讨论。课本设计的活动情景能够自然地引发学生的好奇心，大家积极地投入到话题讨论中，寓教于乐，容易引起学生的兴趣；同时，它也有利于开阔学生的思
2、路，培养创造精神，展开丰富的想象力，人人都能成为“小发明家”。学生在第一课时学习了本单元的Section A 中的1a至2c部分，基本能听懂、会说本单元要求掌握的部分重要词汇；在图片，相关信息等提示的帮助下，能较好地运用重要句型和掌握主动语态和被动语态及相互转换。但是本班的学生两极分化比较严重，有一部分学生基础知识不牢固，前面提到的学过的单词和句型就忘得差不多了，特别是对于课文中的语法主动语态和被动语态，被动语态的一般现在时和一般过去时混为一谈。所以教师在课堂教学中应面向整体，及时复习相关的知识，包括重要词汇和句型，前后知识的衔接。同时在设计上要注意活动的多样性，激发他们的兴趣，让每一位学生能
3、得到不同程度的收获。【单元整体目标】重点词汇：salty, sweet, sour, crispy, pleasant, potato chips, slipper, leaf, fire, scoop, light bulb, microwave oven, abacus, camera, beverage, be invented by, be used for, by mistake, by accident重点句型：When was the telephone invented? I think it was invented in 1876.技能目标：能够谈论发明的历史和用途。能够对
4、生活中的发明发表自己的看法。能够解决生活问题，设计新发明。情感目标:充满想象力，发挥创造能力。【重点难点】重点：讨论重要发明的时间、发明者和用途，学习使用句型“When was the telephone invented?”,“Who was it/were they invented by?”,“What is it/are they used for?”和答语。难点：如何描述一项新发明的来历和用途【课时安排】8课时(新课6课时，复习1课时，)第一课时: Section A: 1a2c,第二课时: Section A: grammar focus, 3a 4第三课时: Section B:
5、 1a2c第四课时: Section B: 3a4b 第五课时：Self- check第六课时：Reading第七课时：Reading第八课时：复习第九课时：单词短语检测Unit 4 When was it invented?学案Period 1 Section A（1a2c）教师寄语：Its never too late to mend. 亡羊补牢，犹为未晚。学习目标：学习一般过去时的被动语态和特殊疑问句。教学重难点：一般过去时态的被动语态基本结构：助动词be（was / were）+及物动词的过去分词A thief was caught last night.They were asked
6、 to speak at the meeting.肯定式：It was made.否定式：It was not made疑问式：Was it made? No, it wasnt Yes, it was 学习过程：1. 情境导入：warm-upAsk the students to be familiar with the words below according to the pictures on computer.Telephone, calculator, car, personal computer, TV, electric light, light bulb, alarm, c
7、lock, microwave oven, electric slipper.2. 自主学习：presentation1) 教学When was the car invented? It was invented inChoose the three inventions of these and ask students to guess when each one was invented.For example, you might choose car, telephone, and personal computer.Have several different students g
8、uess and write the dates on the board. Ask the class to repeat the questions and answers.T=Teacher, S=StudentT: When was the car invented ? (Class repeat.)S1: 1900T: OK. Jackie, repeat after me. The car was invented in 1900.Repeat the process with several different inventions.At last, make students
9、find out the real dates.2) 教学Who were the light bulbs invented by? And what are they used for ?呈现Edison and light bulbs的画面。Tell the students Edison invented light bulbs.Then ask the students to answer the questions below.T: Who were light bulbs invented by? ( Class repeat )T: Good. Now Class repeat
10、after me. They were invented by Edison.3. 合作探究：1)教学 操练1a, 1c, 2c学生看书本上1a的图画，根据图画，把1a, 1c, 2c中的语言点综合起来，叫学生相互间回答问题。并用刚刚学到的目标句型来操练。最后，抽查几对学生，让他们在全班面前，按要求进行对话。2)教学1b, 2a, 2b首先，帮助学生明确本题的要求。接着，听力练习，学生根据录音内容完成1b, 2a and 2b.最后，重放一遍录音内容，学生跟读。4、拓展创新：Consolidation and Extension.完成一个任务Ask some students to read
11、about an invention using an encyclopedia or other book from the library, or by looking up information on the Internet. Have the students write up a short report and draw a simple picture of the invention or bring in a photo of it. Ask each students to show the picture and read his or her report to t
12、he class.5. 梳理知识：本单元主要学习了一般过去时的被动语态，包括其结构与用法。利用几项发明创造练习这一知识，最后用一篇小报告来完成写作练习。6.达标测试： （一）根据时间和人物写出发明物。1) 1885_ 2) 1876 _ 3) 1927_ 4) 1976 _5) Julie Thompson _6) Chelsea Lanmon _（二）汉泽英1)计算机是何时发明的？2)谁发明了计算机？3)计算机是用来做什么？4)你认为什么是最有用的发明？5)它能够给人们更多时间工作和玩。典型例题解析：1.-What a nice classroom! -It _ every day.A. i
13、s cleaning B. has cleaned C. must clean D. is cleaned解析：推测这句话的意思应该是“它每天都被打扫”，考查被动语态的结构be + 动词的过去分词。因此答案应该选D。2.I know Beijing well. I _ there three times.A .will go B. have been C. went D. have gone解析：推测这句话的意思“我很了解北京，我去过那三次”。表示去过应该采用的时态是现在完成时，因此可排除A和C，区别have been和have gone,have been 去过；have gone 去了（还
14、没回来）。因此应该选择B。中考连接：1.-Look at the sign on the right. -Oh, smoking _ here.A .doesnt allow B. isnt allowed C. didnt allow D. wasnt allowed2. -Will you come to the dinner party? -I wont come unless Jim _.A. cant be invited B. was invited C. will be invited D.is invited课后反思：说一说这节课你学到了什么知识？Unit 4 When was
15、 it invented?Period 2 Section A(3a-4)学案I学习目标1学会单词invent heat 已以及be used for 的用法 了解下列单词的意思并能正确读出 calculator scoop adjustable heel operate battery slipper microwave oven light bulb2正确运用被动语态谈论重要的发明的历史和用途II重点呈现1 When was / were invented? 4 What do you think is the most helpful invention?2 Who was / were invented?3 What is /are used for ?III课前准备1 Match the new words with their Chinese meaning invent calculator
