These verbs change o to ue in all the singular persons and in the third person of the plural of the present indicative, and in the whole present subjunctive. They also change o to u in all the singular persons of the preterit, in the whole imperfect subjunctive and in gerund.
O I dormir, morir.
Present indicative
Present subjunctive
Imperative
Yo duermo
Yo duerma
Tú duermes
Tú duermas
Tú duerme
Él duerme
Él duerma
Usted duerma
Nosotros dormimos
Nosotros durmamos
Nosotros durmamos
Vosotros dormís
Vosotros durmáis
Vosotros dormid
Ellos duermen
Ellos duerman
Ustedes duerman
Preterit
Imperfect subjunctive
Yo dormí
Yo durmiera or durmiese
Tú dormiste
Tú durmieras or durmieses
Él durmió
Él durmiera or durmiese
Nosotros dormimos
Nosotros durmiéramos or durmiésemos
Vosotros dormisteis
Vosotros durmierais or durmieseis
Ellos durmieron
Ellos durmieran or durmiesen
Gerund
Durmiendo
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