The document discusses the preterite or past tense in Spanish ("-ed" or irregular forms in English). It notes that the preterite is used to talk about completed actions in the past. For regular verbs, the stem is the infinitive stem. It provides examples of common -ar, -er, and -ir verbs. It then lists the preterite endings for -ar verbs as -é, -aste, -ó, -amos, -asteis, -aron and for -er/-ir verbs as -í, -iste, -ió, -imos, -isteis, -ieron. It reminds that accents are used on the "yo" and "él/ella/Ud

1. El Pretérito de los verbos