What are some examples of present perfect tense?

Related questions

1. What is the present perfect tense of teach?
2. What is the structure of the present perfect continuous tense?
3. What is the past perfect continuous?
4. Why present perfect tense is used?
5. What are examples of present perfect tense?
6. How do you use past perfect continuous?
7. What are perfect tenses in English?
8. Where present perfect tense is used?
9. When use the present perfect continuous?
10. What is the difference between present perfect and present perfect continuous?

Tags

1. #already
2. #letters
3. #since
4. #written
5. #three
6. #finished
7. #graduated
8. #school
9. #homework
10. #lived
11. #worked