Practically none. Tolkien went out of his way to avoid using constructed languages in his books, even going so far as to translate character names (‘Frodo’ is r

Practically none. Tolkien went out of his way to avoid using constructed languages in his books, even going so far as to translate character names (‘Frodo’ is really Maura). When he does provide sentences, there is no effort to make them comprehensible to us; even today, there is no complete reference grammar of even his best attested languages. There is certainly no systematic attempt to teach another language, as seen in Shōgun