The
future tense is used to talk about something that has not happened yet, or
that will or is going to happen.
To translate the English
"will" + infinitive, use the so called synthetic future:
Mañana
compraremos un coche nuevo.
tomorrow we will buy a new
car.
To translate the English
"going to" + infinitive, use "ir" + a +
infinitive:
Mañana
voy a comprar un coche nuevo.
Mañana vas a comprar un coche
nuevo.
Mañana va a comprar un coche
nuevo.
Mañana
vamos a comprar un coche nuevo.
Mañana vais a comprar un coche
nuevo.
Mañana
van a comprar un coche
nuevo.
Tomorrow I am going to buy a new car.
Tomorrow you are going to buy a new car.
Tomorrow he/ she is going to buy a new car.
Tomorrow we are going to buy a new car.
Tomorrow you are going to buy a new car.
Tomorrow they are going to buy a new car.
The same as in English, the first form is more
formal and reserved to the written expression and for something to
happen in not such a distant future.
The future can also expressed with the
present tense in Spanish, if there is a time indicator nearby indicating
that we are talking about something in the
future:
Mañana compramos un coche
nuevo.
Tomorrow we are going to buy a new car.
It is not possible
and wrong to express to use a progressive in
Spanish, as you can see in the following
example: