This is a classroom activity to practice the forms of the preterit and imperfect. You will need a class set of dice for the activity. Each subject is given a number, and they are written on the paper. For example 1=yo 4=nosotros. Students roll the die to determine which form they will be writing. My students love it! If you want to take it one step further, they can then orally make up sentences with each verb form they roll.