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1. Finished action
2. Actions continuously happening at a certain time in the past.
3. Action in progress interrupted by another action.
4. Two actions happening at the same time in the past

Tom was running while Irene and Jessica were just walking.

I was driving home while you were still at work.

Sam didn't realize I arrived because he was listening to music.

I asked them but they didn't know anything.

I tried to tell them the truth but they didn’t listen.

They were thinking about you the other day.

She left because she had to get up early for work.

They were playing video games when there was a blackout.

I was taking a shower when the doorbell rang.

She was interviewing candidates for the sales job all morning.

I was waiting in the departure lounge for more than two hours.

Fred was sudying while Joseph was watching TV.