Tenses Questions
The future perfect tense is used to describe an action that will be completed in the future before another action or time reference. It is formed by using "will have" followed by the past participle of the verb. For example, "By the time she arrives, I will have finished my work."
On the other hand, the past perfect continuous tense is used to describe a continuous action that started in the past and continued up until another point in the past. It is formed by using "had been" followed by the present participle of the verb. For example, "She had been studying for hours before she finally took a break."
In summary, the future perfect tense refers to a completed action in the future, while the past perfect continuous tense refers to a continuous action that occurred in the past.