was changing, used to change
Sally constantemente cambiaba su peinado.
Sally constantly changed her hairstyle.
Yanni no cambiaba.
Yanni wouldn't change.
Mientras tanto, el clima cambiaba de repente.
Meanwhile, the weather suddenly changed.
Oí cómo cambiaba tu voz cuando estaba la cámara.
I heard your voice change when the camera was on.
Cambiaba esa foto por comida.
I would trade that photo for food.
— P.K. (Peekay) (2014)
Tu padre te cambiaba los pañales.
Your father changed your diapers.
— Las invasiones bárbaras (2003)