Question

it's been是什么时态，是什么意思？

Answer 1

现在完成时，意思是已经怎么样。

例句：

It' s been ten years since they married. 

他们结婚到现在已经10年了。

It' s been a lean year for business. 

这是生意清淡的一年。

It' s been a mild winter this year. 

今年冬天不冷。

It 's been using a lot of petrol lately, far more than usually . 

近来这辆车的耗油量很大，远远超过了平时的水平。

It' s been really glorious today, ie warm and sunny. 

今天真是个风和日丽的好天。

Answer 2

it's been =it has been 的缩写，has been 现在完成时。翻译成已经。

Answer 3

现在完成时，已经怎么样。
It's been two years since I met you last .
自从我上次见你已经两年了。