While I (cook) dinner, the phone (ring)
While I was cooking dinner, the phone rang.
He (watch) TV when the rain (start).
He was watching TV when the rain started.
When I (walk) to the store, it (start) raining heavily.
When I was walking to the store, it started raining heavily
They (play) in the park when it (begin) to thunder.
They were playing in the park when it began to thunder.
While she (study) for her exam, her friends (come) to visit.
While she was studying for her exam, her friends came to visit.
The children (play) outside when it (start) getting dark.
The children were playing outside when it started getting dark.
When I (read) a book, the doorbell (ring) unexpectedly.
When I was reading a book, the doorbell rang unexpectedly.
She (play) the guitar when mum (come) in.
She was playing the guitar when mum came in.
While I (clean) my room, I (find) my lost car.
While I was cleaning my room, I found my lost car.
As they (hike) up the mountain, it (start) snowing.
As they were hiking up the mountain, it started snowing.
I (sleep) when the alarm clock suddenly (go) off.
I was sleeping when the alarm clock suddenly went off.
While they (have) a picnic, a group of birds (fly) by.
While they were having a picnic, a group of birds flew by.
He (run) in the park when he (fall).
He was running in the park when he fell.
When I (drive) to work, I (see) an old friend on the street.
WhenI was driving to work, I saw an old friend on the street.
While we (talk) about the project, the music (start) to play.
While we were talking about the project, the music started to play.
They (cycle) in the park when it (begin) to rain.
They were cycling in the park when it began to rain.
