The verbs from this group add c in the first person of the singular of the present indicative and in all persons of present subjunctive.
- ACER complacer, nacer, pacer, renacer.
- ECER abastecer, aborrecer, acaecer *1 , acontecer *1 , adolecer, agradecer, amanecer, anochecer, aparecer, apetecer, atardecer, carecer, compadecer, comparecer, convalecer, crecer, decrecer, desaparecer, desentumecer, desfallecer, desfavorecer, desobedecer, desvanecerse, embellecer, embrutecer, empobrecer, enaltecer, enardecer, encarecer, endurecer, enfurecer, enloquecer, enmohecer, enmudecer, ennegrecer, ennoblecer, enorgullecer, enrarecer, enriquecer, enrojecer, ensombrecer, ensordecer, enternecer, entorpecer, entristecer, entumecer, envejecer, envilecer, esclarecer, establecer, estremecer, fallecer, favorecer, florecer, fortalecer, guarecer, humedecer, languidecer, merecer, obedecer, ofrecer, oscurecer, padecer, palidecer, parecer, perecer, permanecer, pertenecer, prevalecer, reaparecer, reblandecer, recrudecer, rejuvenecer, resplandecer, restablecer.
- OCER conocer, desconocer, reconocer.
- UCIR balbucir *2 , deslucir, lucir, relucir.
| Present indicative | Present subjunctive | Imperative |
| Yo conozco | Yo conozca | |
| Tú conoces | Tú conozcas | Tú conoce |
| Él conoce | Él conozca | Usted conozca |
| Nosotros conocemos | Nosotros conozcamos | Nosotros conozcamos |
| Vosotros conocéis | Vosotros conozcáis | Vosotros conoced |
| Ellos conocen | Ellos conozcan | Ustedes conozcan |
*1 Acaecer and acontecer are defective. They are only used in the third persons of singular and plural, also in infinitive.
*2 Balbucir is defective: it is only used in irregular persons. In those cases we prefer the verb balbucear, which is regular.