【过去完成时的例句】过去完成时是英语中一种重要的时态，用于表示在过去某一时间或动作之前已经发生的事情。它通常与另一个过去的动作或时间点搭配使用，用来说明“先于过去某个时间点发生的动作”。掌握过去完成时有助于更清晰地表达事件之间的先后关系。
以下是过去完成时的基本结构：
- 肯定句：主语 + had + 过去分词
- 否定句：主语 + had not (hadn't) + 过去分词
- 疑问句：Had + 主语 + 过去分词？
下面是一些常见的过去完成时例句，并附有中文解释，帮助理解其用法。
过去完成时例句总结表
| 英文例句 | 中文解释 |
| I had finished my homework before I went to bed. | 我在睡觉前已经完成了作业。 |
| She had left the house when I arrived. | 我到达时她已经离开了房子。 |
| They had eaten dinner before we got there. | 我们到那里之前他们已经吃完了晚饭。 |
| He had not seen the movie before he watched it. | 他看这部影片之前没有看过。 |
| Had you met him before? | 你以前见过他吗？ |
| We had already started the meeting when the boss arrived. | 老板到达时我们已经开始了会议。 |
| The train had left by the time we reached the station. | 我们到达车站时火车已经开走了。 |
| She had written the letter before she sent it. | 她寄出信之前已经写好了。 |
| They had not completed the project yet. | 他们还没有完成这个项目。 |
| Had they prepared the food? | 他们准备了食物吗？ |
通过这些例句可以看出，过去完成时主要用于描述“过去的过去”，即在另一个过去的时间点之前已经发生的事情。在写作和口语中合理使用过去完成时，可以让叙述更加准确、逻辑更清晰。
