1)Have they got a cat?
Who have got a cat?
What have they got?
They have got a cat,haven't they?
How much cats have they got?
2)Are they eating apples?
What are they eating?
They are eating apples, aren't they?
Who are eating apples?
What are they doing now?
3)Will they go to school next Monday?
Who will go to school next Monday?
Where will they go next Monday?
When will they go to school?
They will go to school next Monday, won't they?