过去完成时一、过去完成时的概念与结构特点 概念:过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作,即“过去的过去( past-in-the-past )”。-|- |-|-那时以前 那时 现在 构成:主语+had+过去分词(p.p),其中 had 通用于各种人称。They had already had breakfast before they arrived at the hotel. She had finished writing the composition by 10 :00 this morning. 肯定句:主语+had+过去分词. 否定句:主语+had+not+过去分词. 一般疑问句:Had+主语+过去分词? 肯定回答:Yes,主语+had