Conjugate the verb preferir, and also, what takes place in the conjugation that makes this verb a stem-changing verb?

This is a stem changing verb because in the first person singular, second person singular, and third person conjugations the letter "i" is added after the "f" as follows:

prefiero

prefieres

preferimos

preferis

prefieron

yo prefiero

Tu prefieres

Él prefiere

Nosotros preferimos

Vosotros preferis(there should be an accent on the i)

Ellos prefieren

The second -e becomes -ie when conjugated in the present tense except for when it is conjugated in nosotros and vosotros.

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