What pronoun would you use for como estas?

The most commonly spoken phrase in Spanish greetings is, of course, ¿Cómo estás? which means “How are you?” This is an informal way to ask the current state of a friend, acquaintance, or a new person to whom you would address as tú.

Explanation:

¿Cómo estás? (How are you?)

This means exactly the same thing, but includes the optional pronoun tú (you). In Spanish, the way you conjugate a verb changes depending on how many people you're addressing, and on whether you're in a formal or informal situation.

Como estás is the informal version of how are you, or the tú form of saying you. Está is the formal version or the usted form of you.

Explanation:

Spanish Personal Subject Pronouns

I: Yo.

You: Tú (informal) / Usted (Formal):

He: Él.

She: Ella.

We: Nosotros / Nosotras.

You, plural and informal: Vosotros / Vosotras.

You, plural and formal: Ustedes.

They: Ellos / Ellas.