What is rule of present perfect continuous tense?

Related questions

1. What's the difference between past perfect and past perfect continuous?
2. What are some examples of present perfect tense?
3. What is the structure of the present perfect continuous tense?
4. Why present perfect tense is used?
5. Where present perfect tense is used?
6. When we use future perfect continuous tense?
7. Is Present Perfect a past tense?
8. How do you use past perfect continuous?
9. What is the structure of past perfect continuous tense?
10. When use the present perfect continuous?

Tags

1. #present
2. #began
3. #continuous
4. #about
5. #perfect
6. #structure
7. #affirmative
8. #action
9. #tense
10. #subject
11. #continues
12. #since