前面加介词in，例如：

1、Real wage costs have risen by 10% in the past year.在过去的一年里，实际工资成本增加了10%。

2、He's had three accidents in the past fortnight.在过去两周他出了三次事故。

3、I haven't seen much of her in the past few weeks.近几周来我很少见到她。