What have the children from Paul's class done and haven't done ?
Polly / her ballet dance / just / perform.
Ron / his costume / yet / prepere.
the children / flowers / yet / buy?
the children / people to the concert / yet / invite?
Andy / the poster / just / finish .
Jack / a hat for his tricks / already / bring.
The children / what they will do next year / yet / decide.

Проверьте последнее предложение...такого не может быть...:((

без слова children

Polly has just performed her ballet dance.Ron hasn't prepared his costume yet.Have the children bought flowers yet?Have the children invited people to the concert yet?Andy has just finished the poster.Jack has already brought a hat for his tricks.