for a new action in the past, which interrupts another action that was already taking place.
Cuando me duchaba, sonó el teléfono.
When I was having a shower, the phone rang.
Cuando Elisa entraba en clase, se cayó.
When Elisa was entering the room, she fell down.
Cuando nosotros veníamos del mercado, tuvimos un accidente.
When we were coming back from the market, we had an accident.
Cuando ellos comían en ese restaurante, la policía detuvo a un ladrón.
When they were eating in that restaurant, the police arrested a thief.
Cuando ellos comían en ese restaurante, la policía detuvo a un ladrón.
When they were eating in that restaurant, the police arrested a thief.
Cuando nosotros veníamos del mercado, tuvimos un accidente.
When we were coming back from the market, we had an accident.
Cuando Elisa entraba en clase, se cayó.
When Elisa was entering the room, she fell down.
Cuando me duchaba, sonó el teléfono.
When I was having a shower, the phone rang.