Progressive (or continuous) tenses -- be + ______ing are always for action in progress. The action continues after the time you talk about. Use them when your action is NOT FINISHED.
Past progressive is commonly used to tell stories in the past. I was sleeping when the phone rang. She was doing her homework when the book fell on her toe. We were riding the bus when we met. I was talking while they were studying.
What were you doing during the world cup game on Sunday?
What were you doing during the thunderstorm? Were you worried?
I was taking care of my friend's children during the thunderstorm.
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