concentrar to concentrateImperfect Subjunctive / Imperfecto de Subjuntivo – Version 1yoconcentraratúconcentrarasél / Ud.concentraranosotrosconcentráramosvosotrosconcentraraisellos / Uds.concentraranImperfect Subjunctive / Imperfecto de Subjuntivo – Version 2yoconcentrasetúconcentrasesél / Ud.concentrasenosotrosconcentrásemosvosotrosconcentraseisellos / Uds.concentrasen
Other Tenses / Moods of Concentrar 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