I think the notion that children should not be taught other languages in school is to place a value on ignorance. Seeing people express these kinds of sentiments is so sad to me. Are there really people running around out there who know more than one language who think to themselves "boy, I really wish I'd never been taught that second language...I'd be better off only knowing one"?
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Do you really think the person you're responding to really meant what you wrote? That schools shouldn't teach different languages? I'm guessing, and i haven't followed this thread much, that the person meant not teaching, say, math in spanish.