He has often been there.不用完成时怎么说

He has often been there.不用完成时怎么说 He has often been there.换成He often to there.怎么样 He has often been there.这里为什么要用完成时 完成时的否定It has often been said he has been there _twice____. He has been there for__ 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 never been there.英译汉 he has been working there ( ) 1998. He has been there for six months. He has been there for six months he has been there since 1997s是完成时被动语态吗?如果是为什么要用被动语态?不可以说成he