I only know there's this website. It's supposed to be for American English though. html Anyway, as long as you don't put your tongue in a completely different place (and therefore you really can't pronounce a sound decently), I don't think that focusing too much on tongue position is vital.
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dokterjokkebrokI actually disagree with you on that issue. I think tongue position is actually very vital, because it facilitates smooth, fluent motion of the tongue in your mouth,Well, that's actually true. What I was saying was I would avoid spending too much time on complicated details, for example. There are a lot of variations, and no book or cour