Past tense most used type

Question 1

regulars (everything but ser and ir)

Answer 1

drop AR add ABA or drop ER/IR add IA. NB i´s

Question 2

ser (was)

Answer 2

era, eras, era, eran, er+i´s, eran

Question 3

I was going, you all were going, they were going

Answer 3

iba a, ibais a, iban a