so down they flapped
so down they flap
adv adv pro:sub v
so down they flapped .
s oʊ WORD_BOUNDARY d aʊ n WORD_BOUNDARY ð eɪ WORD_BOUNDARY f l æ p t WORD_BOUNDARY
s o WORD_BOUNDARY d o w n WORD_BOUNDARY t h e y WORD_BOUNDARY f l a p p e d WORD_BOUNDARY