Model: acaecer
Auxiliary: haber
Other forms: no acontecer
These defective verbs follow conjugation pattern of parecer but have infinitive, gerund, participle and 3rd person forms only
Presente
Futuro
Pretérito imperfecto
Pretérito perfecto compuesto
Pretérito pluscuamperfecto
Pretérito anterior
Futuro perfecto
Condicional perfecto
Condicional
Pretérito perfecto simple
Pretérito imperfecto (2)
Pretérito pluscuamperfecto (2)
Pretérito perfecto