In Spanish, what subject pronoun (tú, usted, or ustedes) would you use to talk to each of these people: Pedro; Any y usted; Sra. Vega; Diego, Eva y Raúl; tu madre; Rev. Ortega; Marta?

What you are choosing here

You are picking the Spanish subject pronoun for “you” based on two things: (1) how many people you are speaking to, and (2) whether the situation is informal or formal.

Quick rule

• Use $\textbf{tú}$ for one person in an informal situation.
• Use $\textbf{usted}$ for one person in a formal or respectful situation.
• Use $\textbf{ustedes}$ for more than one person (plural “you”).

Applying the rule to each person/group

• Pedro: one person, typically informal with a peer or friend, so $\textbf{tú}$.
• Any y usted: two people (a group), so plural $\textbf{ustedes}$.
• Sra. Vega: title “Sra.” signals formality, so $\textbf{usted}$.
• Diego, Eva y Raúl: three people, so $\textbf{ustedes}$.
• tu madre: family member, usually informal, so $\textbf{tú}$.
• Rev. Ortega: religious title suggests respect/formality, so $\textbf{usted}$.
• Marta: one person, typically informal with a peer or friend, so $\textbf{tú}$.

One note about regional Spanish

In Spain, informal plural can be $\textbf{vosotros/vosotras}$, but since the choices here are only $\textbf{tú, usted, ustedes}$, the correct plural choice is always $\textbf{ustedes}$.