my brother has never been abroad before 这句话 是这个has been to去某地 不是的话那是什么?

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• my brother has never been abroad before 这句话 是这个has been to去某地 不是的话那是什么?
• My grandfather has been dead for many years.这句话为什么用has been的形式 死亡为什么是被动语态?还有My brother has never been abroad before.这句话为什么也用被动语态?
• my brother has never been abroad before 这句话 是这个has been to去某地 不是的话那是什么?
• been是be的过去式吗?be的过去式和过去分词各是什么啊?
• ._______,we keep records on all the experiments so that we may have enough data.A.As a whole B.As a rule C.On the average D.By all means