新概念二七十三课had been specially built for him 为什么用过去完成时、不用过去时?

新概念二七十三课had been specially built for him 为什么用过去完成时、不用过去时? blluebird ,the car he was driving.had been specially built f had been则是过去的过去,是过去完成时, 现在完成时的那个has been也是过去发生的,他为什么不用过去完成时 为什么最后用had fallen 过去完成时,而不用过去式? 虚拟语气 表示与过去的事实相反的愿望用过去完成时么 为什么用了have been fixed而不是had been fi 新概念第二96课 为什么用过去完成时 We have been living here since 1959 这里的have为什么不用过去时had 为什么li That was the first time (that) I had been in Rome.为什么用过去完成时? over the years the cave wall had been shaped by 为什么用过去完成时 下面句子为什么用的是被动语态was finished而不是过去完成时had been finished 新概念二册34课the police__dan's bicycle 但是是had found 我想说用have been