All irregular verbs form their pretérito perfecto de subjuntivo in a regular way, as mentioned in previous exercises. Just keep in mind that quite a few of these verbs form an irregular past participle. As a model of irregular verbs in the pretérito perfecto de subjuntivo, conjugate the verb poder. Start each conjugated form with a small letter. Press Tab to check your answer. You might wish to use one of the two following on-line helpers to complete your ejercicio: conjugador and acentos en español. ¡Suerte!