yo alquilaba
I used to rent / I was renting
tú alquilabas
you used to rent / you were renting
él alquilaba
he used to rent / he was renting
nosotros alquilábamos
we used to rent / we were renting
vosotros alquilabais
you used to rent / you were renting
ellos alquilaban
they used to rent / they were renting