Someday, it might be used if you take a trip somewhere or have to do a job in a remote area where people might not even know what English is. You could also get money from being a translator for tourists or maybe even on TV. Why would a Mexican want to learn English?
Answer:
Marta vá al cine
Valeria y Arturo van al parque
Vamos al museo
Vas a la tienda de ropa.
Nosotros vámonos a la clase de arte.
Yo voy a la clase de historia.
Explanation: using the different forms of ir.