My brother has never been abroad before
问题描述：
My brother has never been abroad before
abroad是副词为啥前面跟been?
答
has never been abroad 用的是现在完成时态的固定句型：现在完成时表示：之前已发生或完成的动作或状态,其结果的确和现在有联系.动作或状态发生在过去但它的影响现在还存在；也可表示持续到现在的动作或状态.
句型构成
基本结构：主语+have/has+动词的过去分词(p.p）（V-ed） e.g done
have been abrodbeen 是句型中的be动词的过去分词 和abroad 一起组成be aboard 出国的短语.整句的意思是：我的兄弟之前从未出国国.
现在完成时用法(8张)
①肯定句中：主语+has/have+动词的过去分词(p.p)（V-ed）+宾语（或者其他）.
②否定句中：主语+haven't/hasn't+动词的过去分词（p.p）（V-ed）+宾语.
③一般疑问句中：Have/Has+主语+动词的过去分词（p.p)（V-ed）+宾语（或者其他）.（末尾用问号）
例句：
Have you ever been to Beijing?
I have never heard Bunny say anything against her.
I have used this pen only three times. It is still good.
George has met that gentleman on several occasions.