英语新概念语法问题How long has he been waiting for his friend.为什么要用wa

请问He has been waiting for his brother for a long time.是什么时态, 翻译：He has been waiting for his brother for a long time. 为什么是How long has he been there 而不是How long has he gone there 英语现在完成时 How long has the film been on?为什么要用on? I have been waiting regardless of how long do I have been wa How long has he been skating? 选择题-how long has he been away?-( ) He told me he ____(wait) for his friend then.was waiting 为什么 英语翻译这样翻译对么?How long has he been in Hongkong?For about two mo Dear waiting for you in my world,regardless of how long I wa i wonder how long has he been away from australia 为什么不是i won 为什么Could you tell us how long he has been away?和Could you te