While he was watching TV ...
... when I broke my leg.
... when I saw her
... when he phoned me.
While she was walking to school ...
While they were having dinner ...
... when the fire statred.
While she was cooking ...
When the teacher came in ...
While they were playing football ...
While I was doing my homework ...
... when it started to rain.
While we were walking in the park ...
When she was walking to school ...
At midnight ...
While he was having a nap ...
While we were dancing ...