He (fix) his bike when the tire suddenly (go) flat.
He was fixing his bike when the tire suddenly went flat.
They (play) in the park when it (begin) to thunder.
They were playing in the park when it began to thunder.
While we (talk) about the project, the music (start) to play.
While we were talking about the project, the music started to play.
The children (play) outside when it (start) getting dark.
The children were playing outside when it started getting dark.
They (cycle) in the park when it (begin) to rain.
They were cycling in the park when it began to rain.
While she (study) for her exam, her friends (come) to visit.
While she was studying for her exam, her friends came to visit.
While I (clean) my room, I (find) my lost car.
While I was cleaning my room, I found my lost car.
As I (write) an email, the computer suddenly (freeze).
As I was typing an email, the computer suddenly froze.
While they (have) a picnic, a group of birds (fly) by.
While they were having a picnic, a group of birds flew by.
While she (paint) a picture, her cat (jump) on the table.
While she was painting a picture, her cat jumped on the table
She (play) the guitar when mum (come) in.
She was playing the guitar when mum came in.
He (watch) TV when the rain (start).
He was watching TV when the rain started.
I (talk) on the phone when I (understand) that I (forget) to lock the door.
I was talking on the phone when I understood that I forgot to lock the door.
I (sleep) when the alarm clock suddenly (go) off.
I was sleeping when the alarm clock suddenly went off.
While I (cook) dinner, the phone (ring)
While I was cooking dinner, the phone rang.
When I (walk) to the store, it (start) raining heavily.
When I was walking to the store, it started raining heavily
When I (read) a book, the doorbell (ring) unexpectedly.
When I was reading a book, the doorbell rang unexpectedly.
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.
As they (hike) up the mountain, it (start) snowing.
As they were hiking up the mountain, it started snowing.
He (run) in the park when he (fall).
He was running in the park when he fell.