This is an 87 slide Powerpoint explaining the uses of the imperfect and preterit tenses. The explanations are given in English with examples in Spanish. The presentation first explains the preterit, how to form the preterit, it's uses, verbs that change in meaning in the preterit and expressions that indicate use of the preterit. Next, the presentation explains the imperfect tense, how to form the imperfect tense, it's uses and expressions that indicate use of the impferfect tense. Finally, sentences with two verbs are explained with examples including sentences with imperfect/imperfect, preterit/preterit, and imperfect/preterit. The presentation ends with 40 practice slides where students have to decide which tense to use and conjugate the verb correctly. I use the powerpoint to present the notes on this topic and I use the practice section as a game for teams of groups of 4 or 5. This Powerpoint is also available with the explanations in Spanish. If you prefer the explanations in Spanish look for it in my list of products.