When he was about to tell me the news,someone patted him on the shoulder.i heard the telephone ring.i ran downstairs.i wanted to anwser it.(when....to..)When I heard the telephone ring, I ran downstairs to answer it.i drove to work his morning .i notised my petrol tank was nearly empty . i stopped at a filling station.( while driving...so...)While I was driving to work this morning, I notised my petrol tank was nearly empty. So I stopped at a filling station.