It happened
When you (arrive) at the party, who (be) there?
When you arrived at the party, who was there?
My mom ... me while I ... dinner. (speak/eat)
My mom telephoned me while I was eating dinner.
I (sit) in a cafe when you (call) .
I was sitting in a cafe when you called.
The birds (sing) their tunes while the squirrels (eat) nuts.
The birds were singing their tunes while the squirrels were eating nuts.
He (take) a shower when the telephone (ring).
He was taking a shower when the telephone rang.
He (write) the whole homework during the lunch break.
He wrote the whole homework during the lunch break.
While I ... to work, I ... an accident. (walk/witness)
While I was walking to work, I witnessed an accident.
Susie (watch) a film when she (hear) the noise.
Susie was watching a film when she heard the noise.
The children (Study) for school while dad (clean) around the house.
The children were studying for school while dad was cleaning around the house.
I (see) my first baseball match while I (live) in New York.
I saw my first baseball match while I was living in New York.
Yesterday I (go) to the library, next I (have) a swim, later I (meet) Julie for coffee.
Yesterday I went to the library, next I had a swim, later I met Julie for coffee.
Peter ... me while I on the train. (text/sit)
Peter texted me while I was sitting on the train.
We (play) tennis when John (hurt) his ankle.
We were playing tennis when John hurt his ankle.
I (drive) on the highway while my brother (play) a game on his cellphone.
I was driving on the highway while my brother was playing a game on his cellphone.
When the mailman (arrive)at the door, I (do) my math exercises.
When the mailman arrived at the door, I was doing my math exercises.
He (jump) into the river and (rescue) the drowning man.
He jumped into the river and rescued the drowning man.
While I ... out the window, it ... raining. (look/begin)
When her train (get) to the station, we (wait) on the platform.
When her train got to the station, we were waiting on the platform.
As I was planting seed for flowers, my mom was picking strawberries in the garden.
As I (leave) the building, a police car (drive) through the gate.
As I was leaving the building, a police car drove through the gate.
Ana (come) to school with the best Marvel Comic costume and she (make) it all by herself.
Ana come to school with the best Marvel Comic costume and she made it all by herself.
While I ... down the stairs, I ... the phone ring. (run/hear)
While I was running down the stairs, I heard the phone ring.
I (walk) along the street when I (meet) an old friend.
I was walking along the street when I met an old friend.
The sun (shine) and the birds (fly) above us.
The sun was shining and the birds were flying above us.
A murder of crows (fly) by while the farmer (build) a scarecrow.
A murder of crows flew by while the farmer was building a scarecrow.