One of the most outstandings sites of the BBC web pages is the BBC Learning English. It's a web page for students of English as a foreign language.
However, BBC has got several foreign languages sites (visit BBC Languages) for students of other tongues. You have access to audio and video courses of French, German, Spanish, Italian, Greek, Portuguese, Chinese, Russian and others.
BBC German is the one to visit if you want to learn German. The page offers different resources in order to improve your listening, writing, reading and speaking skills: grammar lessons, videos, tests, a newsletter, a tutors area, and so on.
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