I was playing a computer game when my mum came home.
I was doing my homework yesterday at 5
I was having a bath when my friend called me
I was reading a book while my father was reading a newspaper
I was doing my homework while my mother was cooking dinner
I was sleeping while my parents were watching TV
I was going shopping when I ran into my friend
I was listening to music when my sister came into my room
I was having lunch while my mother was washing the dishes
I was watering the flowers while my cat was eating its meal.