教师寄语：all things are difficult before they are easy. 凡事必先难后易。
教学目标：1 掌握section a出现的重点单词和短语。
2 掌握过去进行时（ was/were doing ）的基本用法及when 和while 的区别使用。
教学过程：
第一课时：预习导学及检测：
一按要求写单词形式。
1.理发师___2.理发店3.浴室___4.卧室___
5.厨房___6.不明飞行物___7.外星人___8.着陆。
9.起飞___10.出去、离开11.当…的时候。
get___take___过去式） make___write___get___cut___eat___cook___talk___现在分词形式）
二呈现主题。
1) t: what were you doing when i came in just now?
s2) 设置故事情节、引入1b听力。
3） pair work
what was a/b… doing when the ufo arrived？
he/she was doing…
三、（**交流→展示）
四、看图回答问题（书面巩固）
1.--what was a doing when the ufo arrived？
---she
2.--what was b doing when the ufo arrived？
---he3.--what was c doing when the ufo arrived？
---she
4.--what was e doing when the ufo arrived？
---he第二课时：**交流。
一 (2a)t：read through the picture with the ss .then listen and number.
(2b) t：listen again，and complete the sentences with “when”or“while”，then translate the sentences.
t：（**交流）总结when /while 用法：
二、针对性练习 (用when或while填空).
was writing a letter __she called me.
2.__his mother was cooking，he arrived at home.
were talking___the teacher came in.
4.__i was watching tv. someone knocked(敲)at the door.
三、.group work（2c）
read through the picture , then let the students make sentences with “when” and “while”
—— what were they doing when the ufo took off？
— ①she/he was doing…when the ufo took off.
while she/he was doing…,the ufo took off.
四、(老师总结。grammar focus)
语法：过去进行时。
概念。结构。
常与表示过去的某一特定时刻或过去的某一段时间连用：
如。例： ①iwatch) tv at 8 last night.
weargue) when he came in just now.
变疑问句时。
变否定句时。
把句①和句②变为疑问句和否定句。
第三课时：训练检测。
用所给动词的正确形式填空：
1. father __still __sleep）when i __get）up yesterday morning.
2. grandma __cook）breakfast while i __wash）my face this morning.
3. mother __sweep）the floor when i __le**e）home.
4. the students __h**e）a biology class when the visitors __come）.
5. the driver __drive）home when it __rain）last night.
6. some students from class four __play）basketball when i __see）them on the playground.
7. doctor liu was on duty last night. he __still __work）in the hospital at 10
8. the street seller __sell）clothes when he __find） a purse on the ground.
9. mr wang spends a lot of time writing his novel （**）every day. he __still __work）at midnight last night.
10. i __read）a history book when someone __knock）at the door.
11. masha __cook）when the doorbell___ring）.
they came into the room. jack and mikedo) their homework.
13. i first saw lucy two years ago. shework) in a shop at that time.
14. ilisten) to the walkman when someone came in.
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