colaborar to collaborate, to contribute toPast Perfect Tense / Pluscuamperfecto (de Indicativo)yohabía colaboradotúhabías colaboradoél / Ud.había colaboradonosotroshabíamos colaboradovosotroshabíais colaboradoellos / Uds.habían colaborado
Other Tenses / Moods of Colaborar 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