he was doing what
he be do what
pro:sub aux part pro:int
he was doing what ?
h iː WORD_BOUNDARY w ʌ z WORD_BOUNDARY d uː ɪ ŋ WORD_BOUNDARY w ʌ t WORD_BOUNDARY
h e WORD_BOUNDARY w a s WORD_BOUNDARY d o i n g WORD_BOUNDARY w h a t WORD_BOUNDARY