This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
Eu compro frutas frescas toda semana.
Compro fruta fresca todas as semanas.
I buy fresh fruit every week.
Preterite:
A Ana comprou um celular novo.
A Ana comprou um telemóvel novo.
Ana bought a new phone.
Future:
O Miguel comprará um carro.
Miguel will buy a car.