The Imperfect Past Subjunctive
drlemon.com › Grammar › imp-subjThe third person plural Ellos/as, ustedes form in the Past Subjunctive always ends in "-R A N" in as opposed to the Preterite which ends in "-R O N". We form the past subjunctive by taking the third person plural (Ellos, ellas, ustedes) form of the preterite past tense, and then adding the appropriate Imperfect subjunctive ending.