they ran past fast
they run past fast
pro:sub v adj n
they ran past fast .
ð eɪ WORD_BOUNDARY ɹ æ n WORD_BOUNDARY p æ s t WORD_BOUNDARY f æ s t WORD_BOUNDARY
t h e y WORD_BOUNDARY r a n WORD_BOUNDARY p a s t WORD_BOUNDARY f a s t WORD_BOUNDARY