TAKE A LOOK AT THESE USEFUL RULES:
"To be going to" is the most common way of expressing recent Future or next plans, here you have the way of formation.
Tick on the picture, you can find a link full of online exercises to practice the rules
Use these links to find more exercises online:
COULD YOU TELL
What are these people´s plans for next weekend?
Mary is going to...
Carol and John are going to....
Jack is going to...
WHAT ARE THE MONSTERS GOING TO DO?
Number 1 is going to eat chocolate.
Number 3 is goingo to cook.