LearnLingo

LearnLingo is a free English course in the browser, taught by Sage the Turtle, a patient old teacher who explains each grammar pattern before you practice it. Lessons take about five minutes: you build sentences, listen, match words and fill gaps, with instant feedback. The path follows the CEFR scale from A1 to C1, and Turkish speakers get native-language hints. You can learn without an account. The site also has free grammar guides, vocabulary lists with audio, a phrasebook and a 5-minute level test. There is an Android app, and LearnLingo Plus is optional.