As a consequence of this you will occasionally realize that native speakers distinguish between two sounds that appear the same to you, which means that not onl

As a consequence of this you will occasionally realize that native speakers distinguish between two sounds that appear the same to you, which means that not only you didn't hear the difference, but also you must have been pronouncing it wrong all along. That's where I am right now in English with "Colin" and "calling", after almost twenty years living in English-speaking countries. Sigh!