watch TV / power go off again
I was watching TV when the power went off again.
they / were waiting / the ambulance / when / came / outside
They were waiting outside when the ambulance came.
when / she / went out / the / was watching / electricity / TV
She was watching TV when the electricity went out.
open door / lights come back on
I was opening the door when the lights came back on.
phone police / ambulance arrive
I was phoning the police when the ambulance arrived.
was rehearsing / I / for a concert / my phone / when / rang
I was rehearsing for a concert when my phone rang.
when / in the park / it / we / raining / were running / started
We were running in the park when it started raining.
go home / see an accident
I was going home when I saw an accident.
wash the dishes / water go cold
I was washing the dishes when the water went cold.
were visiting / I / saw / your grandpa / you / last weekend / you / when
You were visiting your grandpa when I saw you last weekend.