what're they doing
what they do
pro:int pro:sub part
what're they doing ?
w ʌ ɾ ɚ WORD_BOUNDARY ð eɪ WORD_BOUNDARY d uː ɪ ŋ WORD_BOUNDARY
w h a t ' r e WORD_BOUNDARY t h e y WORD_BOUNDARY d o i n g WORD_BOUNDARY