i I don't know
i I do know
n:let pro:sub mod v
i i don't know.
aɪ WORD_BOUNDARY aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY
i WORD_BOUNDARY i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w . WORD_BOUNDARY