在过去完成时中，我们通常用来描述在过去某个时间点之前已经完成的动作或状态。这种时态在英语学习中非常重要，因为它帮助我们更准确地表达事件的时间顺序。以下是一些精心挑选的过去完成时例句，供您参考和练习。

1. 当我到达车站时，火车已经离开了。

- By the time I arrived at the station, the train had already left.

2. 她在我见到她之前已经读完了那本书。

- She had already finished reading the book before I met her.

3. 他昨天告诉我他已经完成了作业。

- He told me yesterday that he had already finished his homework.

4. 孩子们在父母回来之前已经睡着了。

- The children had fallen asleep before their parents came back.

5. 我们到了机场后发现航班已经延误了。

- After we arrived at the airport, we found out that the flight had been delayed.

6. 她在会议开始前就已经准备好了所有的文件。

- She had prepared all the documents before the meeting began.

7. 他在考试前就已经复习了所有的知识点。

- He had reviewed all the key points before the exam.

8. 老师告诉我们学生他已经检查了所有的作业。

- The teacher told us students that he had checked all the homework.

9. 他们在出发去旅行之前已经打包好了行李。

- They had packed their luggage before they set off for the trip.

10. 我在见到她之前已经听说了很多关于她的事情。

- I had heard a lot about her before I met her.

这些句子展示了过去完成时在不同场景中的应用，希望对您的学习有所帮助。通过不断练习和使用，您可以更好地掌握这一时态。如果您需要更多例句或练习题，请随时告诉我！