八年级英语（下）学教案班级___姓名___
unit 3 section a 1a-2c 总课时：
课型：new 执笔：许燕审核：文科组时间：2011.03
学习目标】1、会谈论过去发生的事情。2、会讲简单的故事。
重难点】 when、 while 引导时间状语从句。
学习过程】1.按要求做1a。
-- where were you when the ufo arrived?
-- i was …
2. 听录音做1b.
3. 1c pairwork
-- what was he doing when the ufo arrived?
-- he was sleeping late when it arrived.
4. 听录音做2a,2b。
5. 2c groupwork
look at the picture carefully.
say what each person was doing when the ufo took off.
6.自读grammar focus。
**总结】1、when 和while 的用法。
提示：when “当…..时候”后面跟短暂动词， 常用一般过去时，while “当…..时候”，后面跟延续动词， 常用过去进行时。
1）when the ufotake off), the boy was taking photos.
2）while the boystudy) in the library, the ufo took off.
注：when也可以表示时间段，此时等于while.
2、in front of 在…的前面； in the front of在…（内部）的前面。
1) my sister is sitting __the classroom to see the sun.
2) my sister is sitting __the classroom to read english with her classmates
3、过去进行时和一般过去时。
一般过去时：表示在过去某个时间发生过的动作或存在的状态，常用的时间状语有：yesterday, last week, two days ago, in1990等。
过去进行时：表示在过去某一时刻或某一段时间正在进行的动作。常用的时间状语有：
at this time yesterday, at nine o’clock last night，from nine to ten last evening，when，while从句等。
he was writing a letter at this time last night.昨晚这个时候他在写一封信。
he wrote a letter last night.昨晚他写了一封信。
反馈】1. he was sleeping late __someone knocked on the door.
a. when b. while c. asd. after
2.__the police arrived, the alien left the ground.
a. when b. before c. afterd. while
3.__i was walking to school, i saw a cat climbing a tree.
a. when b. while c. before d. after
4. _i was walking on the street, i met my old friend.
5. she was singing __she was walking.
6. i was walking on the street __i met my old friend.
7. they were reading english __i stayed at home.
8. they were talking __i arrived.
9. isleep) when ihear) a knock at the door.
10. when i saw him , hewait) for the bus.
11. whatyoudo) at this time yesterday?
12. inot go ) to the cinema last night.
13. i saw himplay) in the park just now.
14. when you __call) me a moment ago , iwrite) .
15. they enjoylive) here very much.
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