资料看点：3-A-1bmp3 3-A-2amp3 3-A-2bmp3 3-A-3amp3 FW_过去进行时swf Section A ppt what were they doingswf 3-B-2amp3 3-B-2bmp3 3-B-3mp3 climbswf jumpswf scaredswf Section Bppt shoutswf 3-Readingmp3 Self check and readingppt 精品课件）Unit 3 What were you doing when the UFO arrived全单元课件（124张ppt+6动画+8音频）

教学目标：
1. Go on learning about past events .
2. 进一步学习以when, while引导的时间状语从句。
    选择合适的词
1. The boy was ______ (scaring, scared)  when he saw the alien.
2. Laila, please ________ (get out, get out of) the shower quickly. I want to use it.
3. _____ (When, While) I was walking down the street, I saw a stranger.
4. —What’ s up?
    —Did you see the UFO? When it ______ (landed, was landing), I was in the barber’ s shop.
5. What was the robot doing ____ (while, when) the fire started?