[samradelie]

That's neat the teacher brought up the 'tiers' of formality. As an american kid in France growing up, the 'vous-voyez' was instilled early on along with evaluations over the years in written and oral style. You probably remember 'liaisons'? It's as though in the same way a vowel at the beginning of a word causes the last consonant of the previous word to be pronounced, as familiarity increases and formality decreases, the words themselves begin to blend. Somewhere between your examples there'd be "j'ne sais pas" and then if your a high school kid in 2005, "Saich aps"