Imperfect Tense

What was going on?
 

To talk about things going on in the past we use a form called imperfect. Why Imperfect? Because we are only talking about what was going on, what action was in progress, the result (the perfection) of that action does not interest us.

 
What used to be?
 
What did we use to do in the past?
To talk about things that used to be in the past we also use the imperfect.
Imperfect for action in progress: it was going on
Imperfect for actions that happened repeatedly