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Unit3  第一课时
课堂要求：
1.练习掌握本单元的基础知识：一般过去时的用法；以when和while引导的状语从句。
2.能够通过练习熟练掌握如何谈论过去发生的事。
自主先学：
1.完成课本1a要求，图文搭配。
2.预习课本18，19页，找出下列词组
1理发店__________________2在图书馆前边                    3做饭                  
4做奶昔            5打电话       6洗完澡出来                 7理发               
8进入商店                   9看见他们出来           10 出去____________ ___________
11 起飞________________________12火车站_____________13发生了什么事？_____    ______
14洗澡____________15电视台___________16报警_________________17沿着…走____________
3模仿课本1c练习。Look!What were these people doing when the UFO arrived?
 
 
Jim was writing a diary in his bedroom when the UFO arrived.
Belinda was ____________________.  Bob ____________________.
Geoffrey ____________________.The twins were ____________________.
My parents ____________________.
交流探讨
 1 过去进行时
 
2．in front of    in the front of
(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．when 与while的区别
when  “当…..时候”后面跟的动作不延续, 常跟一般过去时
When the UFO took off, the boy was taking photos
while  “当…..时候， 后面跟的动作延续, 常跟过去进行时
While the boy was taking photos, the UFO took off,
1.When the alien got out, the girl was shopping=While the girl was shopping, the alien got out. 
2.When the UFO landed, the boy was walking down the street.
==While the boy was walking down the street, the UFO landed
本环节小测                                           
1.He was sleeping late ______ someone knocked on the door. A.when B.while C.as D.after
2._______ the police arrived,the alien left the ground. A.When B.Before C.After D.While
3.____ I was walking to school, I saw a cat climbing a tree. A.When B.WhileC.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上个礼拜三我正在骑车回家，突然我看见路边有个外星人在买纪念品。

10昨天晚上当我在做作业的时候，我的父母一直在看电视。

11昨天下午当老师近来的时候，我们正在说话呢。

12上午当我在做作业的时候，我妈妈喊我。
对话练习：看课本2c图片，用when和while练习。
例如：A：What was the girl doing when the UFO took off?
B: While the girl was…
C: When the UFO took off the man was…
课后作业
2 I ________(sleep) when I ________ (hear) a knock at the door.
3 When I saw him , he ________ (wait) for the bus. 
4 What __________ you _______ (do) at this time yesterday?
5 I __________ (not go ) to the cinema last night. 
6 I saw him __________ (play) in the park just now.
7 When you __________(call) me a moment ago , I ________ (write) . 
8They enjoy ________ (live) here very much.