Answer:
1. Conjugation of the verb preferir in Present Indicative:
Yo prefiero
Tú prefieres
Él, ella, Usted prefiere
Nosotros preferimos
Vosotros preferís
Ellos, ellas, ustedes prefieren
2. Stem-changing verbs undergo a vowel change in the last syllable of the sme.
Step-by-step explanation:
1. In Spanish, verbs have a different conjugation for each pronoun, and is different in every tense as well. In this case I conjugated the verb preferir (to prefer) in Present Indicative (or Simple Present).
Yo prefiero (I prefer)
Tú prefieres (You prefer)
Él, ella, Usted prefiere (He, she prefers)
Nosotros preferimos (We prefer)
Vosotros preferís (Plural You prefer)
Ellos, ellas, ustedes prefieren (They prefer)
2. In the verb preferir, the "e" in the last syllable of the stem changes to "ie". Present tense stem changes do not apply to nosotros and vosotros forms. These two forms maintain the form of the infinitive stem.
Infinitive = Preferir
Conjugated
Yo prefiero
Tú prefieres
Él, ella, Usted prefiere
Nosotros preferimos
Vosotros preferís
Ellos, ellas, ustedes prefieren