he didn't hear that
he do hear that
pro:sub mod v pro:dem
he didn't hear that .
h iː WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY h ɪ ɹ WORD_BOUNDARY ð æ t WORD_BOUNDARY
h e WORD_BOUNDARY d i d n ' t WORD_BOUNDARY h e a r WORD_BOUNDARY t h a t WORD_BOUNDARY