1. Conjugate the verb preferir in all forms in the Present Tense.

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

1. The conjugation of the verb "preferir" in the Present Tense is:

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

2. The verb "preferir" is a stem-changing verb because the letter E in the stem of the verb changes to IE in the present tense for all pronouns except for nosotros and vosotros. The stem change occurs in the second to last syllable of the verb. In this case, the stem "prefer-" changes to "prefier-" before adding the regular present tense endings.