Never before 'has man been' so highly successful in his attempts to modify the weather on a very small scale.请指点为什么是has man been 而不是man has been

he has never (eat) beijing duck before My father has never been to other countries before.My father has never__ __ before. 翻译：Mike has never repeated himself so much before. He has never been abroad before.这里的been是什么 he is never stoled anything before ,has he?翻译 My brother has never been abroad before为啥加been? He has never been abroad before 分析下句子结构 Mrs.green has never been to shanghai before 一般疑问句 That we are doing has never been done before.改错 never have I seen him before.never before have I seen him .哪个对?why?那么请问，为什么用never before has china developed rapidly? 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 such a thing ___ ( never hear of) before为什么是完成时态?such a thing has never heard of before? He has never been to see a clairvoyant before.为什么不用He has seen a clairvoyant before.been He has never been to see a clairvoyant before.这里的has never been to 有没有什么结构? My father has never been to other contries before.My father has never（ ）before.同义转换.那空就代表两个单词. He has never borrowed money from me.和加上before有什么区别啊He has never borrowed money from me.这句话和下面这句话有什么区别啊,He has never borrowed money from me before. Never before in history has a city been so completely destroyed ,however ,never in all San franci she has never written a book before.这句话有没有语法错误?这句话说的是什么意思?