Question

in the past few years和in the last few years有什么区别，分别用什么时态？

in the past few years用现在完成时还是过去完成时？in the past 又是什么呢？

Answer 1

in the last few years 在最后几年里in the past few years 在过去的几年里

in the past few years
用于现在完成时态.例:In the past few years they have been dealing with quite a few international corporations successfully.
在过去的几年中他们与好几家跨国公司做生意一直做得很成功。
He has shown his captaincy mettle over the past few years.
过去几年里他已经显示出担任队长职务的素质。
The price of house have virtually doubled over the past few years.
房价这几年来简直涨了一倍。

in the past 在过去
例如I've seen little of her in the past few weeks

Answer 2

in the past few years=in the last few years.
时态都用现在完成时
eg:Shanghai has undergone great change in the past/last few years.
上海在过去几年里发生了巨大的变化。

Answer 3

一样的