What tense is used to describe an action that was ongoing in the past?

Which tense is used to describe an action that occurred and was completed in the past?

Which tense is used to describe an action that happened before another action in the past?

Which tense is used to describe an action that started in the past and continued up until another point in the past?

Which tense is used to describe an action that started in the past and continued for a period of time?

Which tense is used to describe an action that happened at a specific time in the past?

Which tense is used to describe an action that had already been completed before another action in the past?

Which tense is used to describe an action that was ongoing in the past but was interrupted by another event?