Question

1.Conjugate the verb preferir.
2.What takes place in the conjugation that makes this verb a stem-changing verb?

Answer 1

1. Yo prefiero, tú prefieres, él/ella/usted prefiere, nosotros/nosotras preferimos, vosotros/vosotras preferís, ellos/ellas/ustedes prefieren.
2. The e in the stem of the verb changes to ie in the present tense forms except for nosotros/nosotras and vosotros/vosotras. This is a characteristic of stem-changing verbs where the stem vowel changes in certain forms of the verb.