Question

(20pts)

Answer 1

The endings are standard -ir verb endings.

Yo-Prefiero

Tu-Prefieres

El/Ella/Usted-Prefiere

Nosotros(as)-Preferimos

Ellos/Ellas/Ustedes-Prefieren

The stem-change is e-ie with the second e (preferir to prefier-).  This occurs in all conjugations of the verb but the nosotros(as) form.  This is the same with all stem-changing verbs in the present tense.

Hope this helps!!