The document discusses the preterit tense in Spanish. It explains that the preterit tense is used to talk about actions that are completed in the past or that occurred within a specific period of time. It then provides examples of regular verb conjugations in the preterit for -ar, -er, and -ir verbs. It notes some spelling changes that occur in the first-person singular form for verbs ending in -car, -gar, and -zar.