About 15 years ago, I invented a card game to teach students the personal endings of verbs (o,s, t, mus, tis, nt as well as the infinitive -re). The game is based upon the premise of the popular card game, BS. It worked incredibly well and I still play it with my class. It can be used with a variety of verb tenses but I primarily use it to teach the present tense. The great thing about this card games is that once you explain the rules, and organize the students into small groups (generally between 3-5 players per group), there's not much for you, the teacher to do. It's a very student-centered activity and by the end of it, everyone will be able to conjugate verbs. I can't explain how to make your own Mendax deck because I sold the game to Bolchazy-Carducci. You can buy it here:
Note: This is the only activity on my website that is for sale. Instructions on how to make the cards for the other two games, Unus and Latin Poker are on other blogs on this page. (See categories along the side).