What is perfect past tense with example?

Related questions

1. Is called past tense?
2. What is perfect tense in English?
3. What's the difference between present perfect and present perfect continuous?
4. How do we use present perfect tense?
5. What are the rules of present perfect tense?
6. Is ago a preposition?
7. Does present perfect tense?
8. What is the use of ago?
9. What is the structure of present perfect tense?
10. When present perfect tense is used?

Tags

1. #tense
2. #subject
3. #before
4. #following
5. #party
6. #sentences
7. #examples
8. #example
9. #perfect
10. #participle