I did morning exercises.Did I do morning exercises?I didn't do morning exercises.He worked at a factory.Did he work at a factory?He didn't work at a factory.She slept after dinner.Did she sleep after dinner?She didn't sleep after dinner.We worked past-time.Did we work past-time?We didn't work past-time.They drank tea every day.Did they drink tea every day?They didn't drink tea every day.Mike was a student.Was Mike a student?Mike wasn't a student.Helen had a car.Did Helen have a car?Helen didn't have a car.You were a good friend.Were you a good friend?You weren't a good friend.You were good friends.Were you good friends?You weren't good friends.It was difficult to remember everything.Was it difficult to remember everything?It wasn't difficult to remember everything.