Unit3 What were you doing when the UFO arrived?学案Section A Period One知识目标：barber shop理发店 get out 出去，离开 take off起飞 sleep late睡过头 land 降落 in front of 在前面 句型：1. What were you doing when the UFO arrived?2. The boy was walking down the street when the UFO landed.3.While the girl was shopping, the alien got out.理解：过去进行时的含义：表示过去某一时刻或某一段时间正在进行或发生的动作。其结构：主语+be动词的过去式（waswere）+其它.能力目标：1.理解并能正确运用过去进行时态表达过去正在发生事情。 2能区别以when 和while引导的时间状语从句：表示过去一个动作发生时，另一个动作正在进行，持续时
