When present perfect tense is used?

Related questions

1. How do we use present perfect tense?
2. What are the forms and functions of present perfect tense?
3. Is ago a preposition?
4. What are the rules of present perfect tense?
5. Is called past tense?
6. Does present perfect tense?
7. What is perfect aspect in grammar?
8. What is the structure of present perfect tense?
9. What's the difference between present perfect and present perfect continuous?
10. What is perfect past tense with example?

Tags

1. #about
2. #since
3. #present
4. #states
5. #usually
6. #habits
7. #continue
8. #tense
9. #april
10. #fixed
11. #started
12. #stative
13. #often
14. #verbs
15. #actions
16. #unfinished