Preterite study

Question 1

preterite tense (ar/er&ir) describes actions completed at a point in the past 
he sent a letter 
mando una carta

Answer 1

yo, -e, -i 
tu, -aste, -iste
el/ella/usted, - o, -io
nosotros, -amos, -imos
ellos/ellas/ustedes, -aron, -ieron