I was running when
I fell.
He was doing his homework when
the phone rang.
They were playing games when
the storm started.
They were watching TV when
he arrived.
I was eating lunch when
I saw Mr Bean.
He was swimming when
he saw a turtle.
He was listening to music when
he started dancing.
We were walking to school when
we saw a cat.
I was playing a video game when
my dog barked.
She was playing Blooket when
the doorbell rang.
