Have you been abroad为什么abroad前不加to

Have you been abroad为什么abroad前不加to Have you ever (been abroad)?为什么不用gone abroad或been to abroad? have you ever been to go abroad have been abroad I have never been abroad have you ever been to go abroad 应该有go还是没go Your spoken English is so good.Have you been abroad Your spoken English is so good.Have you been abroad? 单句改错 He has said to have been born abroad. Have you ever ( ) [study] abroad? I have been abroad only ____(两次) 同意替换： Have you decided to study abroad?