Question

Past Continuous правило

Answer 1

Когда действие было сделано в прошедшем в конкретный момент.
Например:I was at home at 6 o*clock yesterday
Я был дома в 6 часов вчера

Answer 2

образуется пи помощи to be  в прошедшем времени и суффиксом-ing 
I was watching
you were watching
he was watching 
we were watching
you were watching
they were watching