1)We were having breakfast when the mailman arrived.

2)While everyone were sleeping, Paul was watching TV.

3)While I was practicing the piano late last night, I heard a strange noise.

4) While I was practicing the piano late last night, I heard a strange noise.

5) The sheep were gazing in the field when they were scared by the noise.
6.what did you do  when  the earthquake  happen yesterday?
7.I  run to  catch  the bus when  I saw  Jim.
8.when did you  meet James  last night  , what  did he  wear ?
9. some people  was chating  while  others  were playing  games at  the party last night.
10.It was raining at this time yesterday so we  cancled  the barbecue.