Question

Participas en alguna actividad en la escuela despues de las clases?

Answer 1

This is basically asking you this:
Do you participate in any activity after school?

Do you? Let me give an example. I personally do participate in an after-school activity. I am going to write my OWN responses to this question:

"Sí, yo participo en una actividad después de la escuela. Dos veces a la semana voy al gimnasio."

I said, "Yes, I do participate in an activity after school. Twice a week I go to gym."