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过去进行时是英语中的一种时态，它用来描述在过去某个时间正在进行的动作。在句子中，过去进行时通常由“was/were + 现在分词”构成，例如：“I was studying English at the library yesterday.”
过去进行时也可以用来描述两个同时在进行的动作，例如：“While I was studying English, my friend was watching TV.”
需要注意的是，过去进行时强调的是动作的持续性，而不是完成性。也就是说，当我们使用过去进行时时，并不一定要表达动作已经完成了。
下面是一些常见的过去进行时的用法：
用于描述过去某个时间正在进行的动作
- I was cooking dinner at 6 o'clock yesterday.
- They were playing soccer when it started raining.
用于描述过去两个动作同时进行的情况
- She was studying while her sister was sleeping.
- I was listening to music while I was cleaning my room.
用于描述过去某个时间正在进行的状态
- He was feeling sick yesterday.
- I was enjoying the sunshine on the beach.
以上就是关于过去进行时的一些基本知识和用法。希望这篇文章对大家学习英语有所帮助！
