Go train-train, Leave your brain - Vroom

i'll give you just one example: T. With this letter Americans have four different sounds. T can be silent, so "internet" becomes "innernet" and "advantage' becomes "advannage." Another way is when T and N merge- 'Written" becomes "writn" and "certain" becomes "certn." The third sound is when T falls in the middle. There, it sounds like a D-"daughter" is "daughder" and "water" is "wauder". The last category, if you still care, is when Americans say T like a T. This happens, obviously, when T is at the beginning of the word like "table" or "stumble". And this is just one consonant. The vowels are another story. - one night @ call center, Chetan Bhagat, pg.45

credit : Google

p/s : i just realized...