When/while we were having supper,the light went out.我们正在吃饭时灯熄灭了. I was walking in the street when someone called me.我正在街上走时突然有人喊我. While he was waiting for the bus,he was reading a newspaper.他边等车边看报. He was cleaning his car while I was cooking.他擦车时我在做饭