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Our goal with Duolingo is to provide the absolute best language learning service out there (and also make it 100% free!). In this post I want to talk about something that we believe is fundamental towards this goal: students must be able to read and write complete sentences and be given immediate detailed feedback about their answers. When we started working on Duolingo we noticed that most language learning methods outside of the classroom didn't do this. Some never provide you with any feedback (think of books or the audio tapes from the 1980s), while other more "interactive" ones only provide you with feedback on single words or multiple choice questions. As any educator will tell you, having students read and write complete sentences by themselves, and then get detailed feedback, is significantly better for learning.