由于过去的事物是确定的状态，满足特定的属性，例如：
1、Her technique has improved a lot over the past season.在过去的一个赛季里，她的技术大有长进。
2、He needed to make a complete break with the past.他得与过去彻底告别。
3、We were asked in the past when we bought an electric car to pay for the entire well， for the life of the car.过往当我们决定买一辆电力车，我们必须付那口井的全部费用。
