four of them driving
four of them drive
det:num prep pro:obj part
four of them driving .
f oː ɹ WORD_BOUNDARY ʌ v WORD_BOUNDARY ð ɛ m WORD_BOUNDARY d ɹ aɪ v ɪ ŋ WORD_BOUNDARY
f o u r WORD_BOUNDARY o f WORD_BOUNDARY t h e m WORD_BOUNDARY d r i v i n g WORD_BOUNDARY