Suppose you are babysitting your little brother. In Spanish, use an informal command form to tell him to do three things using the verbs hacer, ir, and ser.

Sure, here are three informal command forms (tú) to tell your little brother to do something using hacer, ir, and ser:

1. Haz tu tarea. (Do your homework.)
2. Ve a tu habitación. (Go to your room.)
3. Sé bueno. (Be good.)