What is present perfect tense in English?

Related questions

1. Is have been present perfect?
2. Why we use present perfect continuous tense?
3. Why is the perfect tense called perfect?
4. What is present perfect progressive tense?
5. Why is perfect tense called perfect?
6. What is difference between present perfect and present perfect continuous?
7. What is the structure of present perfect continuous?
8. When use the present perfect tense?
9. What is the present perfect tense examples?
10. What is the difference between present perfect and past perfect?

Tags

1. #english
2. #contexts
3. #express
4. #grammatical
5. #completed
6. #aspect
7. #perfect
8. #event
9. #rather
10. #referred
11. #present
12. #combination
13. #tense
14. #consequences
15. #simple
16. #using
17. #actions