I didn't know that
I do know that
pro:sub mod v pro:dem
i didn't know that ?
aɪ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY n oʊ WORD_BOUNDARY ð æ t WORD_BOUNDARY
i WORD_BOUNDARY d i d n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY t h a t WORD_BOUNDARY