What verbs are considered irregular when conjugated in imperfect?

Question

My spanish teacher from school told me there are only a few words that are irregular in spanish. Please tell me which verbs these are.

Answer 1

"ser" - era, eras, era, éramos, erais, eran - someone used to be, always was. or was being

"ir" - iba, ibas, iba, íbamos, ibais, iban - someone used to go, always went, or was going

"ver" - veía, veías, veía, veíamos, veíais, veían - someone used to see, always saw. or was seeing.

Buena pregunta! .... Bienvenido al foro!

Answer 2

ser, ir, and ver