I really don't know
I really do know
pro:sub adv mod v
i really don't know .
aɪ WORD_BOUNDARY ɹ i ə l i WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY
i WORD_BOUNDARY r e a l l y WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY