when you don't know them
when you do know them
conj pro:per mod v pro:obj
when you don't know them .
w ɛ n WORD_BOUNDARY j uː WORD_BOUNDARY d əʊ n t WORD_BOUNDARY n əʊ WORD_BOUNDARY ð ɛ m WORD_BOUNDARY
w h e n WORD_BOUNDARY y o u WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY t h e m WORD_BOUNDARY