my brother has been abroad before有谁能解释一下为什么是been abroad,abroad不是副词吗新概念的

My brother has never been abroad before为啥加been? my brother has a____ been to Beijing twice my brother has a____ been to beijing twice My brother has never been abroad before中为什么要用has never been 为什么要用has never been has和been My brother has never been abroad beforeabroad是副词为啥前面跟been? 写出同义句 My brother has been a party member for a year.My brother ___ ___ ___ last year. (同义句转换)My brother has been married for two years._____ _____ two years _____ my brother ______. 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 brother has been to the USA __twice___ 对twice 划线部分提问 My brother has been ____(聋的）since he was born. my brother has been ( ) college for over three years .填介词in 还是at my brother has never been abroad before1那个是表示时间的状语 My little brother has never been to ___amusement park.A an B the My brother joined the League _________ March 24,1990.He _____a League member for six yearson,has become .on,has been in,has been in,has become my brother has blue trousers my brother has been abroad before有谁能解释一下为什么是been abroad,abroad不是副词吗新概念的 He has been there for six months 和 My brother has never been abroad before.这2个句中为什么要加BEEN?FOR起什么作用呢》? my brother _____ the army for two years.用哪个选择是对的?为什么?my brother _____ the army for two years.a.has been in b.has entered c.has joined d.has taken part in