Question

You (familiar/singular) are going to learn Spanish.

Tú vas a aprender el español.

Usted va a aprender el español.

Ustedes van a aprender el español.

Answer 1

Tú vas aprender el español is the best option of all because the las one is a group and the second has way too much added on.

Answer 2

Tú vas a aprender el español is correct in this case, because "tù" is the informal, or familiar, form of you. Usted is the formal version of you. Ustedes means you all. :)))