Describe finished actions, past habits, and events that were already in progress.
A finished action at a specific time in the past — I watched a film last night.
An action in progress at a moment in the past — I was watching TV when you called.
A past habit or state that isn't true anymore — I used to live in Kyiv.
A repeated past action, told like a memory — every summer, we would visit.
The earlier of two past actions — I had already left when she arrived.
An action that had been going on up to a point in the past.