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You'll end up speaking street-language often tho. I had formal education in 4 languages, 2 of which I retain fully, for the other 2 I need a week or 2 to adjust and get back into it. Everything else... I'm pathetic, imho. Sure I get shit done, but that is not a measure of mastering a language, it's how well you retain the slang.
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I learned one this way, it is def serve as an example! That's actually the whole point of learning a language: to communicate/get things done.