What are the forms and functions of present perfect tense?

Related questions

1. What is perfect tense in English?
2. Is ago a preposition?
3. What are the rules of present perfect tense?
4. What is past tense and types?
5. Is called past tense?
6. What is the use of ago?
7. What is perfect aspect in grammar?
8. How do we use 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. #composed
2. #present
3. #regular
4. #forming
5. #arrived
6. #auxiliary
7. #appropriate
8. #elements
9. #played
10. #looked
11. #tense
12. #participle
13. #perfect