To conjugate regular -ar verbs in the preterite, simply drop the ending (-ar) and add one of the following:
-é -aste -ó -amos -asteis -aron |
To conjugate regular -er and -ir verbs in the preterite, simply drop the ending (-er or -ir) and add one of the following:
-í -iste -ió -imos -isteis -ieron |