It is common in languages that phonemes (groups of letters making a single sound) are pronounced differently depending in where in a word they occur. At the sta

It is common in languages that phonemes (groups of letters making a single sound) are pronounced differently depending in where in a word they occur. At the start of a word, they may get more emphasis and that can chance the pronunciation. At the end of the word, there is a tendency to drop emphasis as you prepare to speak the next word. That causes a phoneme like “er” to sound like “ur” at the ends of words.