um he didn't start school
he do start school
pro:sub mod v n
um he didn't start school .
ʌ m WORD_BOUNDARY h iː WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY s t ɑː ɹ t WORD_BOUNDARY s k uː l WORD_BOUNDARY
u m WORD_BOUNDARY h e WORD_BOUNDARY d i d n ' t WORD_BOUNDARY s t a r t WORD_BOUNDARY s c h o o l WORD_BOUNDARY