现在完成时,意思是已经怎么样。
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。