We (study) in the library / we (hear) the fire alarm / WHEN
We were studying in the library when we heard the fire alarm.
Your grandma (arrive) / you (watch) TV / WHILE
Your grandma arrived while you were watching TV.
I (walk) into the bank / the men (rob) it / WHILE
I walked into the bank while the men were robbing it.
I (take) the lift / the lights (go) out / WHEN
I was taking the lift when the lights went out.
We (hear) a crash / we (have) a music lesson / WHILE
We heard a crash while we were having a music lesson.
Some workmen (dig) a hole / they (cut) the power line / WHEN
Some workmen were digging a hole when they cut the power line.
My father (make) dinner / the cooker (stop) working / WHEN
My father was making dinner when the cooker stopped working.
My mother (help) the driver / we (wait) for the ambulance / WHILE
My mother helped the driver while we were waiting for the ambulance.
The driver's phone (ring) / we (wait) for the police / WHILE
The driver's phone rang while we were waiting for the police.
I (watch) a football match / the TV suddenly (go) off / WHILE
While I was watching a football match, the TV suddenly went off. / The TV suddenly went off while I was watching a football match.
I (run) outside / I (hear) a noise / WHEN
I was running outside when I heard a noise.