When Use present perfect progressive?

Related questions

1. What is perfect progressive aspect?
2. How do you use present perfect?
3. What is the past progressive?
4. When should we use present perfect tense?
5. What's the difference between present simple and present perfect?
6. What is the formula for present perfect continuous tense?
7. What is a progressive verb example?
8. What are Progressive perfect verbs?
9. Can we use ago with present perfect?
10. Which helping verb is used in future perfect tense?

Tags

1. #continued
2. #started
3. #perfect
4. #called
5. #duration
6. #moment
7. #progressive
8. #action
9. #emphasizes
10. #taking
11. #tense
12. #which
13. #amount
14. #place
15. #continuous
16. #present
17. #usually