he was about to tell me the news .someone patted him on the shoulder 用when连接

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.