Unit 9 When was it invented? 导学案
unit 9 when was it invented? 导学案
教学目标：学习一般过去时的被动语态和特殊疑问句。
重难点：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 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 wasn’t yes, it was
【自主学习】
情境导入：warm-up
ask 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, clock, microwave oven, electric slipper.
【合作探究】
一、 落实预习：见《助学》第133页翻译探究
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 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 the class.
二 小组探究（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。
三 精讲点拨典型例题解析：
1.--what a nice classroom! --it ____ every day.
a. is 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 .doesn’t allow b. isn’t allowed c. didn’t allow d. wasn’t allowed
2. --will you come to the dinner party? --i won’t come unless jim ______.
a. can’t be invited b. was invited c. will be invited d.is invited
四 归纳总结梳理知识：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。
