we didn't finish it
we do finish it
pro:sub mod v pro:per
we didn't finish it !
w iː WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY f ɪ n ɪ ʃ WORD_BOUNDARY ɪ t WORD_BOUNDARY
w e WORD_BOUNDARY d i d n ' t WORD_BOUNDARY f i n i s h WORD_BOUNDARY i t WORD_BOUNDARY