How do you change Simple Past to Present Perfect?

Related questions

1. How do we use past simple?
2. Why Is Present Perfect called that?
3. What is the difference between simple present and present perfect?
4. What is the structure of simple present tense?
5. What are simple tenses?
6. What is the formula of simple present?
7. Why do we use present perfect tense?
8. Why do we use present perfect?
9. What is present perfect tense for kids?
10. What are simple present tense?

Tags

1. #expression
2. #present
3. #before
4. #change
5. #simple
6. #participle
7. #putting
8. #cases
9. #tense
10. #second
11. #perfect
12. #remove