Spanish Preterite tense endings
The preterit tense (el pretérito) is one of several past tenses in Spanish and it is used to describe actions completed at one point in the past or that lasted a specific amount of time in the past and are now completed. The preterit is not used to describe habitual or continuous actions in the past with no specific ending or beginning. The imperfect tense is used for this.
There are only two sets of endings for regular preterit verbs, one for -ar verbs and one for both -er and -ir verbs. Simply remove the infinitive ending and add the correct preterit ending depending on who the subject of the action is.