who's making that sound
who make that sound
pro:rel n:gerund adv n
who's making that sound ?
h uː z WORD_BOUNDARY m eɪ k ɪ ŋ WORD_BOUNDARY ð æ t WORD_BOUNDARY s aʊ n d WORD_BOUNDARY
w h o ' s WORD_BOUNDARY m a k i n g WORD_BOUNDARY t h a t WORD_BOUNDARY s o u n d WORD_BOUNDARY