过去完成时态表示在过去某个时间之前已经完成的动作或状态。
常用的时间状语包括：
1. By the time (到...时候): 表示过去某个时间之前已经完成的动作或状态。
例如，By the time I arrived, they had already left.
2. Before (在...之前): 表示在过去某个时间之前已经完成的动作或状态。
例如，I had finished my homework before she called.
3. After (在...之后): 表示在过去某个时间之后已经完成的动作或状态。
例如，After I had eaten, I went for a walk.
4. When (当...时候): 表示在过去某个时间点已经完成的动作或状态。
例如，When I arrived, they had already started the meeting.
5. As soon as (一...就): 表示在过去某个时间点立即完成的动作或状态。
例如，As soon as he had finished his presentation, everyone applauded.
6. Until (直到): 表示在过去某个时间点之前一直持续的动作或状态。
例如，I had never tried sushi until I went to Japan.
7. Since (自从): 表示从过去某个时间点开始一直延续到现在的动作或状态。
例如，We had been friends since we were in high school.
以上是一些常见的跟过去完成时态相关的时间状语。