If you want to talk about something that happened in the past at a certain time, you have to use the past progressive.
But there are a few things you need to know before you can use it.
Examples:
Yesterday at 3 a.m. I was sleeping.
Yesterday at 3 a.m. you were sleeping.
Yesterday at 6 p.m. we were dancing.
Yesterday at 6 p.m. they were dancing.
when, while, yesterday at ... o`clock
Examples:
The alarm rang while I was sleeping.
He met Lisa while he was walking to the cinema yesterday.
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