The present perfect tense:Have / has + the past participleI have received a letter from Lily recently.Has he handed in her homework yet?He has just gone to Beijing.They have never been to the USA.We have lived here for ten years.past perfect tense过去完成时由had + 过去分词构成 表示过去的过去生的动作 构成方式:肯定句: had+ 动词的过去分词 否定句: 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. 否定回答: No, 主语+ hadnt.基本用法:1. 过去完成时表示在过去某时或某个动作之前发生的动作或存在的状态或表示经历或经验.(1) 我说自从你搬到这儿以来妈妈一直为你的懒惰 而生气.(2) 我到达电影院之前电影早已经开始了.I said mother had been an
