you used (subjunctive); you were to use
Te dije que usaras el cloroformo.
I told you to use the chloroform.
— Mike y Nick y Nick y Alice (2026)
Hey, te dije que usaras la escalera de atrás.
Hey, I told you to use the back stairs.
— Madre (Madeo) (2009)
Sólo te iba a decir que usaras calcetines iguales.
I was just going to tell you to wear matching socks.
— Algunos hombres buenos (1992)
Azaka, ¿no te dije que no usaras magia en público?
Azaka, didn't I tell you not to use magic in public?
— El jardín de los pecadores: Paradigma paradoja (Paradoja espiral) (2008)