I didn't understand you
I do understand you
pro:sub mod v pro:per
i didn't understand you .
aɪ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY j uː WORD_BOUNDARY
i WORD_BOUNDARY d i d n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY y o u WORD_BOUNDARY