What were you doing when the UFO arrived

八年级英语（下）学案15课时
课题：unit3 what were you doing when the ufo arrived?  section b
励志小木屋：today must borrow nothing of tomorrow.今日事今日毕。
预习目标：1、知识目标：
2. 能力目标：1）.能联系上下文理解课文  2）.能谈论过去发事情
3）.能利用情景思维   3.情感目标：热爱科学，探索科学。
预习重点：while, when引导的时间状语从句，过去进行时
预习难点：while, when引导的时间状语从句，过去进行时
 一、自主预习：（一）预习任务： task1.  英汉互译：
climb a tree_______  be too scared_______ at the doctor’s _____________outside the house _______ 跳下_______ 逃跑，跑开 ____________在火车站_______ 喊某人的名字 _______
task2、通过预习3回答问题
 (二)预习诊断：下列各句均有一处错误，请指出并改正
1. the child was shopping while she saw the alien get out.
2. grandma was cooking breakfast when i was washing my face this morning.
3. i read a history book when someone knocked at the door.
4. what did you do at ten o’clock last sunday morning?
5. while the alien was in t