I don't know I'm not sure I understand
I do know I not sure I understand
pro:sub mod v pro:sub neg adj pro:sub v
i don't know i'm not sure i understand .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY aɪ m WORD_BOUNDARY n ɑː t WORD_BOUNDARY ʃ ʊ ɹ WORD_BOUNDARY aɪ WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY i ' m WORD_BOUNDARY n o t WORD_BOUNDARY s u r e WORD_BOUNDARY i WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY