but you don't know when
but you do know when
conj pro:per mod v pro:int
but you don't know when .
b ʌ t WORD_BOUNDARY j uː WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY w ɛ n WORD_BOUNDARY
b u t 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