who's sitting there
who sit there
pro:rel part adv
who's sitting there ?
h uː z WORD_BOUNDARY s ɪ ɾ ɪ ŋ WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY
w h o ' s WORD_BOUNDARY s i t t i n g WORD_BOUNDARY t h e r e WORD_BOUNDARY