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there is和there have有什么区别?

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there is和there have有什么区别?
there is和there have有什么区别?
there is 和there have been得区别就如同 sb do 和 sb have done.
there is 表示当前有的状态;there have been 表示到目前为止有的状态.
there is a man,现在有一个男人;
there have been some boys,从过去某段时间到现在几个男孩一直在;
there had been some boys,在过去的某段时间里有几个男孩在这里.