What is the rule of present indefinite tense?

Related questions

1. When should I use present perfect?
2. What is a progressive verb example?
3. What is simple and progressive aspect?
4. When can I use present perfect?
5. What does present perfect progressive mean?
6. When Use present perfect progressive?
7. What is the past progressive?
8. What is perfect progressive aspect?
9. What is the formula for present perfect continuous tense?
10. Where do we use ago before and?

Tags

1. #happens
2. #simple
3. #person
4. #present
5. #using
6. #action
7. #depending
8. #sometimes
9. #tense
10. #happening
11. #indefinite
12. #adding
13. #right
14. #which
15. #regularly
16. #unceasingly
17. #formed
18. #called