Learn Esperanto.
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Esperanto is a language very suitable for international communication.Free website for learning and studying the international language of Esperanto.
It is also a kind of experiment in teaching methods on the Web — learning a language out of class and without a teacher.
The site has a course for which registration will be required.
The grammar section (Esperanto has a simple and clear grammar).
And a forum where you can find help if something is not clear, and most importantly, start using Esperanto - practice.