What is the formula of present perfect tense?

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Tags

1. #spelling
2. #becomes
3. #adding
4. #example
5. #studied
6. #verbs
7. #participle
8. #played
9. #positive
10. #there
11. #perfect
12. #study
13. #present
14. #regular
15. #tense
16. #change
17. #their