过去完成时表示过去某一时间或动作以前已经发生或完成了的动作，对过去的某一点造成的某种影响或是结果。具体结构如下：
①肯定句：主语+had+动词过去分词+其他.
②否定句：主语+had+not+动词过去分词+其他.
③疑问句：Had+主语+动词过去分词+其他?
肯定回答：Yes,主语+had.
否定回答：No,主语+hadn't.
④特殊疑问句：特殊疑问词或词组+had+主语+过去分词+其他？
⑤被动语态：主语+had(not) +been+动词过去分词+其他
例句：
1、By nine o’clock last night,we had got 200 pictures from the spaceship.
到昨晚9点钟，我们已经收到200张飞船发来的图片。
2、Mr.Smith died yesterday.He had been a good friend of mine.
史密斯先生昨天去世了。他以前是我的好友。
3、She found the key that she had lost.
她丢失的钥匙找到了。
4、I thought I had sent the letter a week before.
我认为我一星期前就把信寄出去了。
5、After he arrived in England,Marx worked hard to improve his English.
马克思到达英格兰之后，努力提高他的英语水平。
6、Hardly had he begun to speak when the audience interrupted him.
他刚开始演讲，听众就打断了他。