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Duolingo: learn languages free. 3,742,363. duolingo education education. everyone learn english, spanish, french, german, italian, portuguese, dutch. Duolingo is the world's most popular way to learn a language. it's 100% free, spanish: french: portuguese. Duolingo: learn languages free. 3,737,737. duolingo education education. everyone learn english, spanish, french, german, italian, portuguese, dutch.