Formas del imperfecto

The imperfect is the easiest, most regular tense in Spanish. Notice that -er and -ir verbs have the same endings (all with accents):
comenzabapedía vivía
comenzabaspedías vivías
comenzabapedía vivía
comenzábamospedíamos vivíamos
comenzabaispedíais vivíais
comenzabanpedían vivían

Irregular verbs in the imperfect

There are only three verbs with irregular forms in the imperfect: ir, ser, and ver. Even so, they are not very difficult:
ibaera veía
ibaseras veías
ibaera veía
íbamoséramos veíamos
ibaiserais veíais
ibaneran veían