The phone rang / was ringing while David had / was having a shower.
rang, was having
I slept / was sleeping when I fell / was falling off the bed.
was sleeping, fell
While they went / were going home they had / were having an accident.
were going, had
When Alex arrived / was arriving, I had / was having dinner.
arrived, having dinner
While we drove / were driving to São Paulo we saw / were seeing an accident.
were driving, saw
I read / was reading a book when you called / were calling me.
was reading, called
She crossed / was crossing the road when I saw / was seeing her.
was crossing, saw
While my father rode / was riding a bike, he saw / was seeing two robbers run out of the bank.
was riding, saw
It started / was staring to rain while they waited / were waiting for the bus.
started, were waiting
They fell / were falling off their bikes because they rode / were riding too fast.
fell, were riding
When I saw / was seeing Martha at the party she talked / was talking to Juliet.
saw, wasn't talking
They played / were playing video games, while their mom washed / was washing the dishes.
were playing, was washing
Mary prepared / was preparing lunch when they came / were coming.
was preparing, came
While my father ran / was running, he saw / was seeing a beautiful bird.
was running, saw
When I met / was meeting Kate, she wore / was wearing a black dress.
met, was wearing
John fell / was falling asleep while he read / was treading a book.
fell, was reading
She ran / was running very fast and she didn't see / wasn't seeing the tree.
was running, didn't see
Last weekend Susan walked / was walking and broke / was breaking her leg.
was walking, broke