Where do we use past perfect tense?

Related questions

1. What are the 3 perfect tenses?
2. What is the past perfect simple in English?
3. What is the difference between past perfect and past participle?
4. What is the example of past perfect continuous?
5. Has stolen or stole?
6. What's the difference between simple past and past perfect?
7. What is the difference between past perfect and present perfect?
8. What is the structure of past perfect continuous?
9. How do you change past simple to Past Perfect?
10. What is the structure of past perfect tense?

Tags

1. #before
2. #tense
3. #perfect
4. #earlier
5. #functions
6. #happened
7. #mentioned
8. #which
9. #clear
10. #matter
11. #another
12. #first
13. #event
14. #refers
15. #makes