Past Perfect Continuous Tense
The past perfect continuous tense is used to describe an action that started in the past, continued for a period of time, and was completed before another past action.
Positive: subject + had been + verb-ing
Negative: subject + had not been + verb-ing
Question: Had + subject + been + verb-ing?
1. To describe a duration of time before a past action
- I had been studying for two hours before I took a break.
- She had not been exercising regularly before she injured herself.
- Had they been working on the project for a long time?
2. To describe a cause of a past action
- He was tired because he had been running for an hour.
- They were late because they had not been planning ahead.
- Had she been feeling sick before she went to the doctor?
3. To describe an ongoing action that was interrupted by another past action
- I had been cooking dinner when the phone rang.
- He had not been studying when it was time for the test.
- Had they been playing football when it started raining?