he doesn't understand
he do understand
pro:sub mod v
he doesn't understand .
h iː WORD_BOUNDARY d ʌ z ə n t WORD_BOUNDARY ʌ n d ə ɹ s t æ n d WORD_BOUNDARY
h e WORD_BOUNDARY d o e s n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY