Irregular verbs in Spanish

Practice conjugating common irregular verbs in the present tense. Earn coins for each correct answer. How much can you earn? Remember, some are irregular just in the yo form, Some are "go" verbs in the yo form. Some are stem changing "boot" verbs:
-ar and -er verbs
e -> ie
u -> ue
o -> ue
-ir verbs
e -> i
o -> ue

And some are both "go" verbs and "boot" verbs!