What subject pronoun would you use in Spanish to talk a young girl?

In Spanish, the subject pronoun you would use to talk to a young girl depends on the level of formality you want to convey:

Formal: Usted

* This is the most formal pronoun and is generally used when addressing someone older than you or someone you don't know well.

* Example: "Usted es muy inteligente." (You are very intelligent.)

Informal: Tú

* This is the most common pronoun used when talking to someone younger than you, a friend, or someone you know well.

* Example: "Tú eres muy linda." (You are very pretty.)

Informal (Plural): Vosotros

* This is the informal pronoun used to address two or more people you know well, typically young people.

* Example: "Vosotros podéis ir al cine." (You guys can go to the movies.)

Note: In some regions of Spain, vos is used instead of tú in informal singular situations. However, tú is generally the most commonly used pronoun.

Ultimately, the best pronoun to use depends on the specific context and your relationship with the young girl.