1.Conjugate the verb preferir.

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

1. Yo prefiero, tú prefieres, él/ella/usted prefiere, nosotros/nosotras preferimos, vosotros/vosotras preferís, ellos/ellas/ustedes prefieren.

2. The e in the stem of the verb changes to ie in the present tense forms except for nosotros/nosotras and vosotros/vosotras. This is a characteristic of stem-changing verbs where the stem vowel changes in certain forms of the verb.

1. To conjugate the verb preferir, follow these steps:

- Start with the verb's stem, which is "prefer".
- Remove the -ir ending to find the stem.
- Add the appropriate endings to the stem based on the subject pronoun.

Here is the conjugation in the present tense:

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

2. The verb "preferir" is a stem-changing verb because the vowel in the stem changes in certain forms of the verb. Specifically, in the present tense conjugation, the e in the stem changes to ie in the second and third person singular and third person plural forms. This change occurs to maintain the proper pronunciation and sound of the verb.