Y replaces i in all the singular persons and in the third person of the plural of the present indicative and in the whole the present subjunctive.
- UIR afluir, atribuir, concluir, confluir, constituir, construir, contribuir, derruir, destituir, destruir, diluir, disminuir, distribuir, excluir, fluir, huir, imbuir, incluir, inmiscuir, influir, instituir, instruir, intuir, obstruir, prostituir, reconstruir, recluir, rehuir, restituir, retribuir, substituir, sustituir.
| Present indicative | Present subjunctive | Imperative |
| Yo huyo | Yo huya | |
| Tú huyes | Tú huyas | Tú huye |
| Él huye | Él huya | Usted huya |
| Nosotros huimos | Nosotros huyamos | Nosotros huyamos |
| Vosotros huís | Vosotros huyáis | Vosotros huid |
| Ellos huyen | Ellos huyan | Ustedes huyan |
The change from i to y in preterit, imperfect subjunctive and gerund is an orthographic irregularity as we said above.