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I think Latin is more useful than Greek for students in any field -- not just classicists -- because it helps students understand the rules of grammar.
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<p>Okay, I have to jump in here because my college studies were in linguistics and various foreign languages, ancient and modern*. Each language has its own rules of grammar. Hardly any rules that are apparent to a high school student studying a particular language are universal. (Universal grammar rules, such as they are, are very abstract and little known even to most college-educated persons who majored in a language.) English, Latin, and Greek are from three distinct branches of the Indo-European language family. Both Latin and Greek have many grammatical features that don't fit English at all. Most of the grammatical terminology taught in schools in the English-speaking world best fits the problem of a Latin speaker learning Greek, because that was the original practical problem faced by western grammarians. (By contrast, traditional Sanskrit grammatical description, dealing with another Indo-European language, treats very different problems, and traditional Chinese grammatical description and traditional Semitic grammatical description treat issues that don't come up in Latin or Greek at all.) </p>
<p>Learning ANY other language is good for developing a sense of how wonderfully ordered--and how amazingly arbitrary--the grammatical rules of any language are. Studying linguistics is especially valuable for learning about features of language that were wholly ignored in traditional grammatical description, which in any one cultural area focused on too few issues with too few materials. A very readable book on linguistics that is still in print is Word Play by Peter Farb </p>
<p><a href="http://www.amazon.com/Word-Play-What-Happens-People/dp/0679734082/%5B/url%5D">http://www.amazon.com/Word-Play-What-Happens-People/dp/0679734082/</a> </p>
<p>which I read for fun to my great learning benefit the summer before I started my college studies. Some parts of this book are laugh-out-loud funny, and almost all of it is thought-provoking about human speech behavior. </p>
<p>English grammar is far, far, far more complicated than the rudimentary, half-fitting rules one would learn by studying the different grammatical rules of Latin. The tour de force in modern books on English grammar is The Cambridge Grammar of the English Language edited by by Rodney D. Huddleston and Geoffrey K. Pullum, </p>
<p><a href="http://www.cambridge.org/uk/linguistics/cgel/%5B/url%5D">http://www.cambridge.org/uk/linguistics/cgel/</a> </p>
<p><a href="http://www.amazon.com/Cambridge-Grammar-English-Language/dp/0521431468/%5B/url%5D">http://www.amazon.com/Cambridge-Grammar-English-Language/dp/0521431468/</a> </p>
<p>which amply serves to illustrate the huge number of grammatical rules of English known to any native speaker that have no counterpart in Latin or Greek. </p>
<p>If the issue is just studying a language available in American high schools to learn a better sense of English grammar, one might do well to study German, which like English is part of the Teutonic branch of the Indo-European language family, and thus has many features shared with English that neither language shares with Latin. But the high school student mentioned in this thread can make up his own mind, based on such local conditions as which teacher in his high school teaches which class, and which lessons appear to be the most fun. </p>
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<li>Basis of knowledge for statements above: I studied German beginning in elementary school (it was mandatory in my very unusual public school district in Minnesota), Russian in high school, continuing Russian in college but eventually majoring in Chinese (studying both the modern and the literary language), taking elective courses in Cantonese, various subjects in linguistics, reading German, Biblical Hebrew, Attic Greek, and English etymology. Overseas, I studied Japanese, Taiwanese, and Hakka with Mandarin-speaking instructors. I have self-studied a great variety of languages from multiple language families in varying degrees of depth, and worked for most of my early married life as a Chinese-English interpreter or language teacher. </li>
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<p>Good luck to the young man figuring out what to put on his high school schedule. My son would load up his schedule almost entirely with math and computer languages, including Malbolge, </p>
<p><a href="http://en.wikipedia.org/wiki/Malbolge%5B/url%5D">http://en.wikipedia.org/wiki/Malbolge</a> </p>
<p>if I would let him.</p>