Hi Jeffrey,
it depends what you need help with. Is it the vowel sounds that you don't know how to pronounce? Or you know how to pronounce a single word but you can't join different words together in a sentence? Much depends on your native language, also. Often Asians have trouble pronouncing r's, but for most Europeans that's not a big problem. I read a book on American accent not long ago, to try to reduce my foreign accent, and it really helped me a lot. But, depending on your particular problems, it might not be the right book for you. So let us know what your problems are in particular, then we will see.
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Americans speak fast? Well, let's say that the more I listen to Americans speak, the more they speak slowly. In other words, to us learners it seems they speak too fast only because we are not much used to the way they speak. Once you improve your pronunciation and after a little more practice in listening, you will find that understanding what you think it's impossible to understand is actually quite simple (it takes a lot of time though, I'm still practicing and still suck at listening, but I notice significant improvement anyway
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