he didn't didn't he not
he do do he not
pro:sub mod mod pro:sub neg
he didn't didn't he not?
h iː WORD_BOUNDARY d ɪ d n tʰ WORD_BOUNDARY d ɪ d n tʰ WORD_BOUNDARY h iː WORD_BOUNDARY n ɒ tʰ WORD_BOUNDARY
h e WORD_BOUNDARY d i d n ' t WORD_BOUNDARY d i d n ' t WORD_BOUNDARY h e WORD_BOUNDARY n o t ? WORD_BOUNDARY