Preterite of regular verbs:

1
Preterite of regular verbs

• To talk about actions that were completed in the
  past, use the preterite tense.
• To form the preterite tense of a regular verb,
  add the preterite endings of the stem of the
  verb.
• AR ER IR
• MIRAR COMER VIVIR
• Miré miramos comí comimos viví vivimos
• Miraste comiste viviste
• Miró miraron comió comieron vivió
  vivieron

2
ENDINGS

• AR é, aste, ó, amos, aron
• ER/IR í, iste, ió, imos, ieron
• yo-bailar
• Tu-comer
• Ellos-hablar
• Ustedes-vivir
• Yo-comer
• Ella-escribir
• Nosotros-tomar
• Usted-cantar

3
Car, gar, zar

• Verbs that end in -car, -gar, and -zar have a
  spelling change in the yo form of the preterite.
• Buscar c-qu yo busqué
• Pagar g-gu yo pagué
• Almorzar z-c yo almorcé
• There is no stem-change in the preterite.