I don't understand it
I do understand it
pro:sub mod v pro:per
i don't understand it.
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY ɪ t WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY i WORD_BOUNDARY