This can be used as a homework assignment or a group activity. As a group activity, I call it "Verbos con Grupo" Students sit in groups of 3-6 and each student has a different colored writing utensil. First students complete the top identifying the boxes of irregulars, but not filling them in. Next, each group receives a dice. One person begins filling in the verbs in the preterit (in any order) as quickly as possible while the other members in the group attempt to roll a 6. When someone rolls a 6, that person takes the paper and begins to write. At the end of the activity (either when you call time or when the paper is full), the person in the group with the most correctly conjugated verbs wins.