Question

if you (visit) our town during the carnival , you (have) a great time

Answer 1

If you visit our town during the carnivai, you wil have a great time

Answer 2

1 If you (visit) our town during the carnival, you (will have) a great time.
2 If you (visited) our town during the carnival, you (would have) a great time.
3 If you (had visit) our town during the carnival, you (would have had) a great time.