过去完成进行时的句子
时间：2026-07-03 08:55:06来源：过去完成进行时用于描述在过去某一时间之前一直在持续的动作。它由“had been + 现在分词”构成。
总结：
过去完成进行时强调动作的持续性和延续性，常与“when”引导的时间状语从句连用，表示某个动作发生前一直在进行。
| 结构 | 例句 | 含义 |
| had been + V-ing | She had been waiting for an hour when he arrived. | 在他到达之前，她已经等了一个小时。 |
| had been + V-ing | They had been studying all day before the exam. | 考试前，他们已经学习了一整天。 |
| had been + V-ing | I had been working on the project for two weeks. | 我已经在这个项目上工作了两周。 |
该时态常用于叙述过去的经历或背景，使语言更自然、准确。
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