who's doing aerobics
who do aerobics
pro:rel n:gerund n:pt
who's doing aerobics ?
h uː z WORD_BOUNDARY d uː ɪ ŋ WORD_BOUNDARY ɛ ɹ oʊ b ɪ k s WORD_BOUNDARY
w h o ' s WORD_BOUNDARY d o i n g WORD_BOUNDARY a e r o b i c s WORD_BOUNDARY