I didn't trip him
I do trip him
pro:sub mod v pro:obj
i didn't trip him !
aɪ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY t ɹ ɪ p WORD_BOUNDARY h ɪ m WORD_BOUNDARY
i WORD_BOUNDARY d i d n ' t WORD_BOUNDARY t r i p WORD_BOUNDARY h i m WORD_BOUNDARY