英语中一般过去时和过去完成时是两种常用的时态。一般过去时表示过去某个时间点或一段时间内发生过的动作或状态，而过去完成时则表示在过去某个时间点之前已经完成的动作。
一般过去时的构成
一般过去时的构成是在动词原形后面加上了-ed或-d，也有一些不规则动词需要特别记忆。例如：
- walk → walked
- watch → watched
- study → studied
- go → went
- eat → ate
一般过去时的用法：
- 表示过去某个时间点内发生的动作。
- I walked to school yesterday.
- 表示过去一段时间内的连续动作。
- I lived in New York for 5 years.
- 表示过去的状态。
- She was happy when she heard the news.
过去完成时的构成
过去完成时的构成是由had + 过去分词构成。例如：
- walk → had walked
- watch → had watched
- study → had studied
- go → had gone
- eat → had eaten
过去完成时的用法：
- 表示过去某个时间点之前已经完成的动作。
- I had finished my homework by the time my friends arrived.
- 表示过去的结果。
- He had lost his phone, so he couldn't call his friend.
以上是一般过去时和过去完成时的基本构成和用法。掌握这两种时态对于学习英语来说非常重要，希望本文能对大家有所帮助。
