求初二英语下册第三单元重点也就是课堂笔记,题目是What were you doing when the UFO arrived?八年级下册英语第三课的知识点

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求初二英语下册第三单元重点
也就是课堂笔记,
题目是What were you doing when the UFO arrived?八年级下册英语第三课的知识点

What were you doing when the UFO arrived?
主句:What were you doing是过去进行时,过去进行时表示的是过去正在做的动作.
从句:when the UFO arrived是过去时.
整句意思是”当不明飞行物到达的时候,你正在做什么事情呢?”