Which statement is grammatically correct?

Question options:

Voy a compro una casa.


Voy a compras una casa.


Ir a compro una casa.


Voy a comprar una casa.

Respuesta :

The last one, voy a comprar una casa
The sentence is "I'm going to buy a house" so believe the answer is "Voy a comprar una casa."
Hope this helps :)