This document provides a lesson on the differences between the preterite and imperfect tenses in Spanish. It explains that the preterite is used to refer to actions that occurred at a specific point in time or number of times, while the imperfect is used to describe repeated or ongoing actions in the past. It gives examples of uses for each tense and includes verb conjugations and practice questions to help understand when to use the preterite and imperfect tenses.