过去完成时的用法及练习题(详解)

过去完成时的用法及练习题(详解)
过去完成时是英语中的一种时态，表示在过去某个时间点或动
作之前已经完成的动作或状态。

它由过去助动词“had”和动词的过
去分词构成。

以下是过去完成时的用法及相关练题。

用法
1. 表示在过去的某个时间点或动作之前已经完成的动作或状态。

例如：
- She had already left when I arrived.（我到达时她已经离开了。

）- They had finished their dinner before the movie started.（电影开
始前他们已经吃完晚饭了。

）
2. 用于条件句中，表示在过去某个时间点或动作之前的假设情况。

例如：
- If she had studied harder, she would have passed the exam.（如果她学得更努力，她就能通过考试了。

）
3. 表示过去某个时间点或动作之前的完成状态持续到另一个时间点。

例如：
- By the time she arrived, I had already finished my work.（她到达时，我已经完成了我的工作。

）
练题
1. 完成下列句子，使用过去完成时填空：
- They ____________ (already/leave) before I arrived.
- By the time I woke up, she ____________ (finish) cooking breakfast.
- If he ____________ (study) more, he would have passed the test.
2. 将下列句子改写为过去完成时：
- I saw him before he left.
- She ate dinner before the movie started.
- If I had known, I would have helped.
答案：
1. 完成下列句子，使用过去完成时填空：
- They had already left before I arrived.
- By the time I woke up, she had finished cooking breakfast.
- If he had studied more, he would have passed the test.
2. 将下列句子改写为过去完成时：
- I had seen him before he left.
- She had eaten dinner before the movie started.
- If I had known, I would have helped.
以上是关于过去完成时的用法及相关练习题的详解。

通过理解和练习，我们可以更好地运用这一时态来表达过去的完成情况。