it is some time since+...与it has been some time since+...什么区别?

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it is some time since+...与it has been some time since+...什么区别?

it is some time since+...与it has been some time since+...什么区别?
it is some time since+...与it has been some time since+...什么区别?

it is some time since+...与it has been some time since+...什么区别?
没有区别.现在完成时态中,it has been+时间,常可简写成it is +时间

基本上没区别,都用来表示某动作持续了多长时间。这是一个将短暂性动作转变成延续性状态常用的结构。例如:He joined the army three years ago,不能说成He has joined the army for 3 years,但可以说成It is 3 years since he joined the army. 或者It has been 3 years since he ...

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基本上没区别,都用来表示某动作持续了多长时间。这是一个将短暂性动作转变成延续性状态常用的结构。例如:He joined the army three years ago,不能说成He has joined the army for 3 years,但可以说成It is 3 years since he joined the army. 或者It has been 3 years since he joined the army.

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