My brother has never been abroad before

My brother has never been abroad before 解释句子成分:My brother has never been abroad before." My brother has never been abroad before中为什么要用has never been my brother has never been abroad before 这句话 是这个has been to去某 新概念英语 My brother has never been abroad before 这里before为什么在后面 my brother has never been abroad before为什么用been而不用gone? my brother has been abroad before有谁能解释一下为什么是been abroad,abro 翻译并现在完成时改成现在进行时my brother never been abroad before . My mother has never been abroad He has never been abroad before.这里的been是什么 my brother has never been abroad before1那个是表示时间的状语 He has never been abroad before 分析下句子结构