过去完成时的讲解！要简洁，初二的知识？我刚接触过去完成时的！THANK YOU

过去完成时

The Past Perfect Tense

构成：过去完成时由"助动词had（通用于各种人称和数）+过去分词构成。

用法：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。它表示动作发生的时间?quot;过去的过去"。与by、before等构成的短语连用。

Statements 陈述句

They had already had breakfast before they arrived at the hotel.

在他们到达旅馆之前，他们已经吃早饭了。

从句中"arrived at"到达在"过去"的时间，而"had already had"吃早饭的动作发生在到达之前，因此主句的时态为"过去的过去"。

I had finished writing my composition by 10:00 this morning. 今天上午10：00点以前，我已经写完了我的作文。

She had searched the internet for two hours when she found an ad for the Canon digital camera. 当她找到了佳能数码照相机的广告时，她已经在因特网上查询了两个小时。

I went over what I had written again and again so that I wouldn't make any mistakes. 我一遍又一遍地检查了我所写的内容，以至我没有出现任何错误。

Negative 否定句

He remembered he hadn't paid for it yet. 他记得?挥懈犊睢?br> He said that he had never seen such a beautiful bird before.

他说他以前