I don't know who
I do know who
pro:sub mod v pro:rel
i don't know who ?
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY h uː WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY w h o WORD_BOUNDARY