acontecer to happen, to occurFuture Perfect Subjunctive / Futuro Perfecto de Subjuntivoyohubiere acontecidotúhubieres acontecidoél / Ud.hubiere acontecidonosotroshubiéremos acontecidovosotroshubiereis acontecidoellos / Uds.hubieren acontecido
Other Tenses / Moods of Acontecer Simple Tenses Present Tense Imperfect Tense Preterite (Past Tense) Future Tense Conditional Tense Subjunctive Tense Imperfect Subjunctive Future Subjunctive Imperative (Command) Past Participle & Gerund Compound Tenses Present Perfect Past Perfect Past Anterior (Preterite Perfect) Future Perfect Conditional Perfect Present Perfect Subjunctive Pluperfect Subjunctive Future Perfect Subjunctive