Past Simple:
1. I wrote an interesting story.
2. We became friends last year.
3. I saw my aunt yesterday in the shop.
Past Continuous:
1. She was selling vegetables in the supermarket.
2. I was going to the hospital to visit my grandmother.
3. My relatives were laughing at the party.
Past Perfect:
1. They had written an essay.
2. We had done it the day before.
3. Mary had chosen a new job.
Past Perfect Continuous:
1. She had been singing at the concert.
2. Tim had been drawing a picture.
3. Susan had been dancing with her boyfriend.