The preterite and imperfect are two past tenses used in Spanish and can be especially difficult for students to understand. This powerpoint presentation nicely lays out the differences between the preterite and imperfect tenses in Spanish. The powerpoint is in Spanish and is perfect for upper level (3, 4, and 5) classes as well as university or college courses. It is also perfect for those who need a "refresher" on the uses of the preterite and imperfect in Spanish. This powerpoint has gotten rave reviews from students!