I don't know maybe
I do know maybe
pro:sub mod v adv
i don't know maybe .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY m eɪ b iː WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY m a y b e WORD_BOUNDARY