you don't know their name
you do know their name
pro:per mod v det:poss n
you don't know their name ?
j uː WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY n eɪ m WORD_BOUNDARY
y o u WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY t h e i r WORD_BOUNDARY n a m e WORD_BOUNDARY