Play the frog game! and try the monkey game! or the catapult game!
Here you can practice affirmative form:
exercise 1 exercise 2 exercise 3 exercise 4 exercise 5
Here you can practice negative form:
exercise 1 exercise 3 exercise 3 exercise 4 exercise 5
Here you can practice interrogative form:
exercise1 exercise2 exercise3 exercise4 exercise5
Watch this video and then play the game!