look I don't understand
look I do understand
v pro:sub mod v
look i don't understand .
l ʊ k WORD_BOUNDARY aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY
l o o k WORD_BOUNDARY i WORD_BOUNDARY d o n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY