Why do we use future perfect continuous tense?

Related questions

1. What is the rule of future continuous?
2. What is perfect continuous?
3. Can we use since in future perfect continuous?
4. How do you form the future perfect?
5. What are the uses of present perfect continuous tense?
6. What is the rule of Future Perfect?
7. What is the difference between future perfect and future perfect continuous?
8. What is the meaning of future perfect tense?
9. What is the future perfect tense of write?
10. What are the rules of future perfect tense?

Tags

1. #present
2. #perfect
3. #point
4. #activity
5. #until
6. #begun
7. #continue
8. #future
9. #continuous
10. #actions
11. #tense
12. #expected
13. #describes
14. #sometime