Unit 9  When was it invented? 導學案

unit 9  when was it invented? 導學案      
教學目標：學習一般過去時的被動語態和特殊疑問句。
重難點：教學重難點：
一般過去時態的被動語態
基本結構：助動詞be（was / were）+及物動詞的過去分詞
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.
疑問式：was it made?       no, it wasn’t     yes, it was
【自主學習】
情境導入：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、 落實預習：見《助學》第133頁翻譯探究
教學  操練1a, 1c, 2c
學生看書本上1a的圖畫，根據圖畫，把1a, 1c, 2c中的語言點綜合起來，叫學生相互間回答問題。并用剛剛學到的目標句型來操練。最后，抽查幾對學生，讓他們在全班面前，按要求進行對話。
2)教學1b, 2a, 2b
首先，幫助學生明確本題的要求。接著，聽力練習，學生根據錄音內容完成1b, 2a and 2b.
最后，重放一遍錄音內容，學生跟讀。
4、拓展創新：
consolidation and extension.
完成一個任務
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 小組探究（二）漢澤英
1)計算機是何時發明的？
2)誰發明了計算機？
3)計算機是用來做什么？
4)你認為什么是最有用的發明？
5)它能夠給人們更多時間工作和玩。
三 精講點撥典型例題解析：
1.--what a nice classroom!  --it ____ every day.
a. is cleaning  b. has cleaned  c. must clean d. is cleaned
解析：推測這句話的意思應該是“它每天都被打掃”，考查被動語態的結構be + 動詞的過去分詞。因此答案應該選d。
2.i know beijing well. i ____ there three times.
a .will go  b. have been  c. went  d. have gone
解析：推測這句話的意思“我很了解北京，我去過那三次”。表示去過應該采用的時態是現在完成時，因此可排除a和c，區別have been和have gone,have been 去過；have gone 去了（還沒回來）。因此應該選擇b。
中考連接：
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 歸納總結梳理知識：本單元主要學習了一般過去時的被動語態，包括其結構與用法。利用幾項發明創造練習這一知識，最后用一篇小報告來完成寫作練習。