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T：Suppose，a UFO arrived in Lanzhou，what were you doing？
教授新句型Where were you when the UFO arrived?
I was in the bathroom.
What were you doing when the UFO arrived?
I was taking the shower.
Then ask students to look at the picture again.
Get students to writer the letter of each person on the writ-on line in front of each sentence.
2. 1b
This activity gives students practice to understand the target language in spoken conversation.
Point to the people in the picture in activity.
Playing the recording and ask students to circle the correct phrases.
3. 教师先示范，给出一组图片，学生Pairwork
Where were you when…?
What were you doing when…?
What happened？图片
Step 5 Investigation
The boy was walking down the street when the UFO landed.
While the boy was walking down the street, the UFO landed.
The girl was shopping when the alien got out.
While the girl was shopping, the alien got out.
When+主语+一般过去时，主句.
While+主语+过去进行时，主句.
Step6 2c Extension/Consolidation
pairwork as 2c
Look at the picture below.Say what each person was doing whenn the UFO took off.Make sentences with “when” and “while”.
Ask students to work in small groups.
Step7 Summary
What did we learn today? Can you say something?
含义： 表示现在正在进行的动作。 含义:表示过去某个时刻正在进行的动作。
结构：is/am/are + doing 结构：was/were + doing
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