what did he hear
what do he hear
pro:int mod pro:sub v
what did he hear ?
w ʌ t WORD_BOUNDARY d ɪ d WORD_BOUNDARY h iː WORD_BOUNDARY h ɪ ɹ WORD_BOUNDARY
w h a t WORD_BOUNDARY d i d WORD_BOUNDARY h e WORD_BOUNDARY h e a r WORD_BOUNDARY