She came home, switched on the computer and checked her e-mails.
Simon was playing on the computer while his brother was watchin TV.
My mobile rang (when I was sitting in a meeting.)
While I was sitting in a meeting, (my mobile suddenly rang.)
Colin played football yesterday.
Yesterday at six o'clock, Colin was playing football.
They were playing tennis (at 10.30)
What were they doing at 10.30?
Tom burnt his hand when he was cooking dinner.
I saw Jim in the park. He was sitting on the grass and reading a book.
It was raining when I got up this morning.
While I was working in the garden. I hurt my back.
When Tom arrived, we had dinner.