What is the structure of past perfect tense?

Related questions

1. What is the structure of past perfect continuous?
2. Has stolen or stole?
3. What is the rule of simple past?
4. What is the past perfect simple in English?
5. What is the rules of past perfect tense?
6. What is past perfect tense formula?
7. What is the past of steal?
8. What is the past tense of sleep?
9. What is past perfect aspect?
10. What are the 3 perfect tenses?

Tags

1. #structures
2. #happens
3. #subject
4. #another
5. #occurred
6. #simple
7. #completed
8. #before
9. #participle
10. #action
11. #tense
12. #usually
13. #actions
14. #perfect
15. #sentence
16. #there
17. #other
18. #demonstrate