Qué quieres comprar? - informal
Qué quiere comprar usted? - formal
how to say will buy in spanish
Quiero un corte de pelo
Usted quiere comprar un ladrillo?
To say "to buy" it would be comprar.
Quieres que te compro un telefono (movil)? Do you want me to get (buy) you a (mobile) telephone?
"I want to buy" is translated as "(yo) quiero comprar". "Yo" is understood and usually not said.
To say 'I want bread' in Spanish, you would say 'Yo quiero pan.'
To say 'I want meat' in Spanish, you would say 'Yo quiero carne.'
To say 'I want cereal' in Spanish, you would say 'Yo quiero cereales.'
To say 'I want paper' in Spanish, you would say 'Yo quiero papel.'
To say 'I want a chair' in Spanish, you would say 'Quiero una silla.'
To say 'I want to eat a carrot' in Spanish, you would say 'Yo quiero comer una zanahoria.'