then they flew over the Charles river
then they fly over the Charles river
adv:tem pro:sub v prep det:art n:prop n
then they flew over the charles river .
ð ɛ n WORD_BOUNDARY ð eɪ WORD_BOUNDARY f l uː WORD_BOUNDARY oʊ v ɚ WORD_BOUNDARY ð ə WORD_BOUNDARY t̠ʃ ɑː ɹ l z WORD_BOUNDARY ɹ ɪ v ɚ WORD_BOUNDARY
t h e n WORD_BOUNDARY t h e y WORD_BOUNDARY f l e w WORD_BOUNDARY o v e r WORD_BOUNDARY t h e WORD_BOUNDARY c h a r l e s WORD_BOUNDARY r i v e r WORD_BOUNDARY