Ann, Yes. I agree that fluency takes a lot of work. I've never become fluent because I don't work at it hard enough. You are correct in saying that fluency will probably not happen for most with Duolingo unless it is just used for a brush up. I do like the Babble program and with practice conversational speaking could be reached. I'm not sure I agree about the word roots being recognizable for most - the meaning of the words yes, but reconizing the roots and what they mean are probably not. It depends on one's education and area of expertise - maybe just educated in a different subject area. Thanks, though, for your thoughtful comments! I appreciate them!