Past simple vs. past continuous 2.0
I tripped over something while I was running on the street.
You were playing a game, when you heard a noise.
The dog was playing when its owner called.
He ... (to write) a story when his laptop ... (to break) down.
My sister ...(to fall) while we ... (to walk) in the forest.
They ...(to swim) in the ocean, when they ...
( to see) a piranha.