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 cars Active Voice: 2. past simple. I signed the contract     past perfect. I had signed the contract     past continuous. I was signing the contract Active 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