you don't know when
you do know when
pro:per mod v pro:int
you don't know when .
j uː WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY w ɛ n WORD_BOUNDARY
y o u WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY w h e n WORD_BOUNDARY