How do you use the present perfect tense?

Related questions

1. What is the formula of present indefinite?
2. What is the meaning of 4 years ago?
3. Does hence mean before or after?
4. What is the difference between back and AGO?
5. What is the difference between Hence And ago?
6. What part of speech is ago?
7. What does a few days ago mean?
8. What does one year ago mean?
9. Where do we use hence?
10. What is the difference of before and after?

Tags

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