My idea is a tic-tac-toe game.

We divide the class in two groups (X and O). On the board we make the tic-tac-toe diagram. In each space we can write a verb (for example). One student from the side (X) will choose one of the verbs and say its past tense. It it is correct X is placed in that square. Now it is O's turn and so on.

Remembering that they are trying to make three X's or O's in a row for the tic-tac-toe and win. This could be done with possessives, maths problems, definitions of vocabulary words, and mostly anything you can think of.

Kids love it because it's a game, I love it because they are learning.