The document discusses the preterite tense in Spanish. It provides examples of what the preterite tense is not used for, such as describing past time, age, weather, or habitual actions. It states the preterite tense is used for one-time past actions like "I went swimming" or "You ate guacamole." It also gives instructions on forming the preterite tense by dropping the ending and adding new endings for AR, ER, and IR verbs. A few irregular preterite verbs are listed as well as important words used with the preterite tense like "yesterday" and "last week."