who is doing it
who be do it
pro:int aux part pro:per
who is doing it ?
h uː WORD_BOUNDARY ɪ z WORD_BOUNDARY d uː ɪ ŋ WORD_BOUNDARY ɪ t WORD_BOUNDARY
w h o WORD_BOUNDARY i s WORD_BOUNDARY d o i n g WORD_BOUNDARY i t WORD_BOUNDARY