The conversation between human and AI assistant.
What is the best service to refresh my Russian?
I've used Duolingo in the past, but I found it wasn't very challenging. Which one do you think is the most effective for advanced learners?
For advanced learners, I would recommend trying Rosetta Stone. Its immersive learning method can really help you improve your language skills quickly. Additionally, they offer live tutoring sessions where you can practice speaking with a native speaker.