yo percibía
I used to perceive / I was perceiving
tú percibías
you used to perceive / you were perceiving
él percibía
he used to perceive / he was perceiving
nosotros percibíamos
we used to perceive / we were perceiving
vosotros percibíais
you used to perceive / you were perceiving
ellos percibían
they used to perceive / they were perceiving