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

1.Polly has just performed her ballet dance
2.Ron has prepared his costume yet
3.The children have bought flowers yet
4.the children have 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 decided what they will do next year yet