What is the structure of present perfect tense?

Related questions

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

Tags

1. #perfect
2. #present
3. #verbs
4. #simple
5. #using
6. #auxiliary
7. #regular
8. #structure
9. #participle