Написать по 3 примера(Past continious,past perfect,,past simple)

Active Voice:1. Past simple. I sold cars    Past perfect. I had sold cars    Past continuous. I was selling carsActive Voice:2. past simple. I signed the contract    past perfect. I had signed the contract    past continuous. I was signing the contractActive Voice:3. past simple. We calculated the transaction costs   past perfect. We had already calculated the transaction costs   past continuous. We were calculating the transaction costs