Final answer:
In the preterite tense, the 1st person singular endings for -ar verbs change to -é, and for -er and -ir verbs to -í, with some irregular verbs having different changes such as 'tener' to 'tuve', 'hacer' to 'hice', and 'ir' to 'fui'.
Step-by-step explanation:
In the preterite tense in Spanish, the 1st person singular often has unique verb endings. Regular -ar verbs change their endings to -é. For instance, 'hablar' (to talk) becomes 'hablé' (I talked).
Regular -er and -ir verbs change to -í, as in 'comer' (to eat) becoming 'comí' (I ate) and 'vivir' (to live) becoming 'viví' (I lived). However, there are several irregular verbs that change differently, such as 'tener' which becomes 'tuve' (I had), 'hacer' which becomes 'hice' (I did), and 'ir' which becomes 'fui' (I went).
In the preterite tense, the 1st person singular endings for -ar verbs change to -é, and for -er and -ir verbs to -í, with some irregular verbs having different changes such as 'tener' to 'tuve', 'hacer' to 'hice', and 'ir' to 'fui'.