IR + A For places (where are we going?): They are going to school in order to study. = ELLOS VAN A LA ESCUELA PARA ESTUDIAR.
We are going to the kitchen in order to clean the stove.
.
I am going to the dining room in order to eat.
.
You are going to the school in order to talk to friends.
.

IR + A For actions (what are we going to do?):
I am going to read in the bedroom. = (YO) VOY A LEER EN EL DORMITORIO.
She is going to clean the stove in the kitchen.
.
We are going to sleep in the bedroom.
.
They are going to sleep in the living room.
.

TENER + QUE For what we have to do:
You have to practice! = ¡TÚ TIENES QUE PRACTICAR!
We have to study!
.