When I worked in the garden, my little sister was sleeping.
When Nick returned home, his brother was playing with his toys.
When mother rang up home, I was doing my homework.
When father repaired the car, Pete was watching the process.
When mother came to home, the children were playing on the carpet.
When I got up my mother and father were drinking tea.
When I opened the door, the cat was sitting on the table.
While I washed up the floor I was finding my gold earring.
He turned off the electricity, when I was listening to the radio.
She looked out of the window when I was seeing to her.
When did you go to bed yesterday?
My father was repairing his car the whole day yesterday.
I began to prepare for my exam at 6pm the day before yesterday.
I was sleeping while my sister did her homework.

Перепроверите если что)