be about to do when +句子，表示“正要做某事，这时。。。”，你所给的句子意思为“他正要停止比赛，这时。。。”。又如：I was about to go out when it began to rain.我正要出门，这时下起雨来了。be doing(过去进行时态)+when"正在做某事，这时。。。"had done(过去完成时)+when"刚刚做完某事，这时"I was having my supper when Tom came to see me.我正在吃饭，这时汤姆来看我了。I had finished my supper when Tom came to see me.我刚吃完饭，这时汤姆来看我了。...
