what're they doing
what they do
pro:int pro:sub part
what're they doing?
w ʌ t ə ɹ 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