- Ella va a comprar el libro. (She is going to buy a book.)
This might seem confusing since we just learned that ir + a describes where you are going. The trick is to look for the infinitive verb. If it is there, we are talking about what we are going to do, if it is not, we are talking about where we are going.
- ir + a + infinitive:
Yo voy a estudiar esta noche. (I am going to study tonight) - ir + a + destination:
Yo voy al cine esta noche. (I am going to the cinema tonight).