I I don't know
I I do know
pro:sub 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