Tenses Questions
The past perfect continuous tense is used to describe an ongoing action that started in the past and continued up until another point in the past. It is formed by using "had been" + present participle (-ing form of the verb). For example, "She had been studying for hours before she finally took a break."
On the other hand, the future perfect tense is used to describe an action that will be completed before a specific point in the future. It is formed by using "will have" + past participle of the verb. For example, "By the time she arrives, I will have finished cooking dinner."
In summary, the main difference between the past perfect continuous and future perfect tenses is that the past perfect continuous focuses on an ongoing action in the past, while the future perfect focuses on an action that will be completed before a specific point in the future.