What are the 3 progressive tenses?

Related questions

1. When can I use present perfect?
2. What is progressive example?
3. Can we use ago with present perfect?
4. What is the past perfect progressive?
5. What is the past progressive?
6. When Use present perfect progressive?
7. Is ago an adverb of time?
8. What is the structure of present indefinite tense?
9. Where do we use ago before and?
10. What is the formula for present perfect continuous tense?

Tags

1. #basic
2. #imperfect
3. #appropriate
4. #perfect
5. #three
6. #future
7. #tenses
8. #coming
9. #tense
10. #present
11. #formed
12. #correspond
13. #followed
14. #called
15. #participle
16. #progressive
17. #sometimes