I've never seen one
I never see one
pro:sub adv part pro:indef
i've never seen one .
aɪ v WORD_BOUNDARY n ɛ v ɚ WORD_BOUNDARY s iː n WORD_BOUNDARY w ʌ n WORD_BOUNDARY
i ' v e WORD_BOUNDARY n e v e r WORD_BOUNDARY s e e n WORD_BOUNDARY o n e WORD_BOUNDARY