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I think a lot of language acquisition happens when you're a kid. I did well with German in highschool, because Mom used to teach me songs in German when I was little.
But interestingly, I have been unable to *change* languages. Since so many people at my job speak Spanish, I've been working on picking it up. It's not difficult, since it's mostly Latin. BUT, if someone asks me a question in Spanish, I formulate the Spanish response in my head, I hear it in my brain, then I open my mouth and the answer nearly always comes out in German. Go figure that one.