有个人刚学外语，这天在街上走，不小心踩了一个老外的脚，那人急忙说：“I`m sorry.”老外也礼貌的说了句：“I`m sorry too.”那人一听，急忙说了句：“I`m sorry three.”老外一听傻了，问：“What are you sorry for?”那人无奈的说：“I`m sorry five.”