I haven't seen them
I have see them
pro:sub aux part pro:obj
i haven't seen them .
aɪ WORD_BOUNDARY h æ v ə n t WORD_BOUNDARY s iː n WORD_BOUNDARY ð ɛ m WORD_BOUNDARY
i WORD_BOUNDARY h a v e n ' t WORD_BOUNDARY s e e n WORD_BOUNDARY t h e m WORD_BOUNDARY