I'm not downstairs
I not downstairs
pro:sub neg adv
i'm not downstairs .
aɪ m WORD_BOUNDARY n ɑː t WORD_BOUNDARY d aʊ n s t ɛ ɹ z WORD_BOUNDARY
i ' m WORD_BOUNDARY n o t WORD_BOUNDARY d o w n s t a i r s WORD_BOUNDARY