existir to existFuture Perfect Subjunctive / Futuro Perfecto de Subjuntivoyohubiere existidotúhubieres existidoél / Ud.hubiere existidonosotroshubiéremos existidovosotroshubiereis existidoellos / Uds.hubieren existido
Other Tenses / Moods of Existir 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