How do we use present perfect tense?

Related questions

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

Tags

1. #tense
2. #finished
3. #describe
4. #homework
5. #participle
6. #makes
7. #exact
8. #important
9. #relationship
10. #perfect
11. #happened
12. #present
13. #something