What have the children from Paul's class done and haven't done ? Polly / her ballet dance / just / perform. Ron / his

1. Polly has just performed her ballet dance. 2. Ron has not prepared his costume yet. 3. Have the children bought flowers yet? 4. Have the children invited people to the concert yet? 5. Andy has just finished the poster. 6. Jack has already brought a hat for his tricks. 7. The children have not decided yet what they will do next year.