Hi guys. It was mentioned many times in this forum that some native speakers pronounce the y with a sound similar to the ch sound, especially if the y is preceded by a d. However, is it exactly a ch sound or is it something different? To my understanding at least, for the ch sound, the the upper and lower back teeth are contacting each other and the lips are protruded. For the Y however, the upper and lower teeth in the back should not be touching. So in the case where the y is pronounced almost like a ch as in "did you do this?", should the back teeth be touching for the "y that sounds like a ch"? I hope this isn't a confusing question. Thank you so much guys.