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I/We/They/He/She were/was -ing …
Observe(观察) the sentence structure
Past Progressive Tense (过去进行时)
基本结构：主语+ was/were doing +其它
用法：表示在过去某一时刻或一段时间内正在进行的动作。这一特定的过去时间除有上下文暗示以外, 一般用时间状语来表示。
I was doing my homework ___________________.
He was watching TV ________________________.
We were having English class ______________.
at this time yesterday
at seven yesterday evening
when it rained
Watch the change of the sentence structures and tell the rule：
一般疑问句把____________调到句首，回答时，也用___________.
was / were
was / were
It
was
raining
all night.
They
were
shopping
at six yesterday.
Was
it
raining
all night?
Were
they
shopping