Very useful app
After 20 years of using English finally decided to work on my accent and at first found a sister book on Amazon. Found app much easier to use than a book with a CD. Some pronunciations with added spelling were revelations. The underlined difference between Russian and English pronunciations of similarly written sounds is seriously helpful. The verses and tongue-twisters are quite fun, not as difficult as seems at first. Would be good to see more phonetic spellings in every lecture. Overall an excellent and unique product.
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