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时间:2018-09-22 英语知识 我要投稿
  过去完成时  The Past Perfect Tense  过去完成时的构成  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。主要表示过去某时前已发生的动作或情况(也可说是"过去的过去"):  By the time I got there, it had already finished.  When I got to the check-out, I realized I had left my purse at home.  He said he had never seen such an exciting match before.  注:如果时间状语从句的动作发生在前,则从句用过去完成时,主句用一般过去时。  When he had finished his work , he left his office .  After I had done my homework , I went to bed.  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。  否定句  He remembered he hadn't paid for it yet. 他记得他还没有付账。  He said that he had never seen such a beautiful bird before.  他说他以前从来没有看过这样美丽的鸟。  疑问句  How many English films had you seen by the end of last term?  到上学期期末为止,你们看了多少部英文片?  Had you reached the station before ten o'clock?  十点以前,你们已经到达火车站了吗?
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