Does duolingo offer certificate?

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5. Can you become fluent in French with duolingo?
6. Is the duolingo owl a boy or a girl?
7. How successful is duolingo?
8. Does duolingo tell you how fluent you are?
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Tags

1. #english
2. #learning
3. #service
4. #offers
5. #releasing
6. #mobile
7. #standardized
8. #called
9. #duolingo
10. #device
11. #skills
12. #tests
13. #language
14. #users
15. #their
16. #devices
17. #certification
18. #center
19. #potentially