it has been some time+since是什么意思

it has been some time+since是什么意思 it is some time since+...与it has been some time since+...什么区 为啥it is some time since与it has been some time since没区别 为啥it is some time since与it has been some time since没区别谢谢了, It has been some time since we last connected with you,we wo It's a long time since还是It has been a long time since it has been since.用法 it has been a long time since+?since后面加什么形式? How have you been?It had been quite some time since we last It has been a long time since anything as good as you has ha It has been a long time since i saw you last time. “It be some time+ since短语或从句” 这里面的be用哪种形式呢?is,was还是has been呢