were going, used to go, were (doing)
Sus palabras iban llenas de melancolía.
His words were filled with melancholy.
Todos los que iban en el coche dijeron que querían salir y estirar las piernas.
Everyone in the car said they wanted to get out and stretch their legs.
Iban a ochenta kilómetros y nos adelantaron.
They were going eighty kilometers per hour and they overtook us.
Casi todos los días iban caminando desde sus casas.
Almost every day, they walked from their homes.
Bosco, llamó hace un rato, iban a una fiesta.
Bosco called a while ago; they were going to a party.
— Tesis (1996)
Tom y Mary dijeron que se iban.
Tom and Mary said they were leaving.
Al poco tiempo, los seis anunciaron que se iban.
Soon afterward, all six announced they were leaving.
Al gatito le encantaba perseguir las monedas que iban rodando.
The kitten loved chasing the coins that were rolling by.
En medio de todo aquello, nuestros sucesos se iban anotando en el registro.
Amid all of that, our experiences were being recorded in the log.