过去完成时是什么结构

1、过去完成时主动语态 I had given him three books. S主语+had+V过去分词+其他成分 2、转换成被动语态 Three books had been given to him by me. 宾语提前做主语+had+been+V过去分词。 3、过去完成时的被动语态有以下三种形式： (1)肯定结构：主语+ had been done +其他成分 (2)否定结构：主语+...