This lesson is for subjunctive paradigms that cannot be derived from the present yo form and opposite-vowel endings. An irregular example ser in Presente de SubjuntivoShow Stepsyoseatúseasvosseasél/ella/Ud.seanosotrosseamosvosotrosseáisellos/ellas/Uds.seanyoseatúseasél/ella/Ud.seanosotrosseamosellos/ellas/Uds.sean