I'm going to buy
Eu acho que vou comprar o mais barato.
I think I’ll buy the cheapest one.
I’ll buy you another one.
Vem, vou comprar um sorvete para você.
Come on, I'll buy you some ice cream.
I'm going to buy a new house.
Me empreste sua carteira, vou comprar um calça.
Lend me your wallet, I'm going to buy a pair of pants.
— 3 Idiotas (2009)
Assim que eu tiver dinheiro, vou comprar uma.
As soon as I have the money, I'm going to buy one.
— Azul É A Cor Mais Quente (2013)
I'm going to buy onions.
Vou comprar o mais caro mesmo.
I’m going to buy the most expensive one anyway.
I'm going to buy a pen from him.
I'm going to buy bananas.