He has been there for six months这里的has been是什么时态

He has been there for six months这里的has been是什么时态 He has been there for six months. He has been there for six months He has been there for six months. My brother ha He has been there for six months 和 My brother has never been He has been there for six months在这里表示去了还没回来,为什么不用has gone? He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略. He has been there for six months .为什么句中有been,有什么作用? he has been there for six months中的been怎么理解? He has been there for six months.has been后面为什么不加to?还有为什么要加fo he has been there for five six mouths He has never been abroad before.这里的been是什么