What is the formula of Present Perfect?

Related questions

1. What are examples of aspects?
2. What is the example of simple present tense?
3. What are simple verbs?
4. How do you identify the present perfect tense?
5. How do we use present perfect progressive?
6. Is the present perfect a present or past tense?

Tags

1. #continuous
2. #perfect
3. #present
4. #actions
5. #formula
6. #still
7. #participle
8. #began
9. #tense
10. #continuing