I don't understand that
I do understand that
pro:sub mod v pro:dem
i don't understand that .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY ð æ t WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY t h a t WORD_BOUNDARY