[znt]

Thank you for the detailed information.

The only feedback the user gets is a score for the current phrase, and highlighting of the words that he has mispronounced.

For example: If the phrase was "Where is the closest hospital?" but you said "Where is the closest clinic?", the application would highlight correct words in green and incorrect ones (hospital in this case) in orange/red depending on the word distance of "clinic" to "hospital")

When I say "word distance" I mean Levenshtein Distance: http://en.wikipedia.org/wiki/Levenshtein_distance

I never thought about giving basic information about English phonology, but you make a very valid point. I will look into this further, and please let me know about any detailed resources about this subject.