помогите пожалуйста сделать номер 1. СРОООООООЧННОООО!!!!!!!!!!!!

1.Polly has just performed her ballet dance2.Ron has prepared his costume yet3.The children have bought flowers yet4.the children have invited people to the concert yet5.Andy has just finished the poster6.Jack has already brought a hat for his tricks7.The children have decided what they will do next year yet

1)Pollyhas just performed her balletdance