used (to use), were using
Antes, los políticos usaban el sistema para ganar dinero.
Previously, politicians used the system to make money.
— Tropa de élite 2 (2010)
Estos químicos se usaban para hacer tacones de zapato.
These chemicals were used to make shoe heels.
Los magos las usaban cuando yo era joven.
Wizards used them when I was young.
Usaban a la niña como traficante.
They used the girl as a drug runner.
— El hombre sin pasado (2010)
Yo no sabía que usaban la puerta de atrás.
I didn't know they used the back door.
— Un profeta (2009)