im not sure how much this helps, but it looks like you are just looking at the verb deciding if it’s imperfecto or pretérito so here are the conjugations for both.
pretérito:
yo-í
tú-iste
él-ió
nosotros-imos
ellos-ieron
imperfecto:
yo-ía
tú-ias
él-ia
nosotros-iamos
ellos-ian
