What is the structure of the present perfect continuous tense?

Related questions

1. What is the difference between present perfect and present perfect continuous?
2. When use the present perfect continuous?
3. What are examples of present perfect tense?
4. What are some examples of present perfect tense?
5. Where present perfect tense is used?
6. What is the present perfect tense of teach?
7. What are present perfect tense examples?
8. What is the structure of present continuous?
9. What's the difference between past perfect and past perfect continuous?
10. What are perfect tenses in English?

Tags

1. #structure
2. #hours
3. #sitting
4. #perfect
5. #present
6. #tense
7. #continuous