While they (play) football, they (see) a snake.
While they WERE PLAYING football, they SAW a snake.
When I (arrive), they (look) for the lost girl.
When I ARRIVED, they WERE LOOKING for the lost girl.
We (sail) along the beach when there (be) a storm.
We WERE SAILING along the beach when there WAS a storm.
I (have) an accident when I (drive) home.
I HAD an accident when I WAS DRIVING home.
He (sleep) when the clock (ring).
He WAS SLEEPING when the clock RANG.
I (see) my friend while I (shop).
I SAW my friend while I WAS SHOPPING.
He (walk) when he (fall).
He WAS WALKING when he FELL.
He (fall) asleep while he (study).
He FELL asleep while he WAS STUDYING.
She (cook) dinner when she (cut) her finger.
She WAS COOKING dinner when she CUT her finger.
He (listen) to music when his teacher (walk) in.
He WAS LISTENING to music when his teacher WALKED in.
He (break) his leg while he (play) football.
He BROKE his leg while he WAS PLAYING football.
She (swim) when a shark (attack) her.
She WAS SWIMMING when a shark ATTACKED her.
