who was playing a guitar
who be play a guitar
pro:int aux part det:art n
who was playing a guitar?
h uː WORD_BOUNDARY w ʌ z WORD_BOUNDARY p l eɪ ɪ ŋ WORD_BOUNDARY ʌ WORD_BOUNDARY ɡ ɪ t ɑ ɹ WORD_BOUNDARY
w h o WORD_BOUNDARY w a s WORD_BOUNDARY p l a y i n g WORD_BOUNDARY a WORD_BOUNDARY g u i t a r ? WORD_BOUNDARY