Gerundio: bruñendo.
Pretérito: bruñó (tercera persona, singular), bruñeron (plural).
Imperfecto de Subjuntivo: bruñese, etc.; bruñera, etc.
Futuro de Subjuntivo: bruñere, etc.
VERBS HAVING UNACCENTED I BETWEEN TWO VOWELS
Since unaccented i may not stand between two vowels, those verbs of the second and third conjugation whose stems end in a vowel, substitute a y for the i. Thus the form creiendo is avoided and creyendo is written. These changes occur in the present participle, the preterite, third singular and plural, the imperfect subjunctive and the future subjunctive. Creer and huir will serve to illustrate this point.
45. Creer, to believe.
Gerundio: creyendo.
Pretérito: creyó; creyeron.
Imperfecto de Subjuntivo: creyese, etc.; creyera, etc.