Conjugate the verb preferir in all forms in the present tense.

What takes place in the conjunction that makes this verb a stem changing verb?

The verb preferir is conjugated as follows in the present tense:

- Yo prefiero (I prefer)
- Tú prefieres (You prefer)
- Él/Ella/Usted prefiere (He/She/You formal prefer)
- Nosotros/Nosotras preferimos (We prefer)
- Vosotros/Vosotras preferís (You all prefer)
- Ellos/Ellas/Ustedes prefieren (They/You all prefer)

The verb preferir is a stem changing verb because the vowel e in the stem of the verb changes to ie in the present tense conjugations, except in the nosotros/nosotras and vosotros/vosotras forms. This change occurs to maintain the pronunciation of the word.