I'm drinking coffee
I drink coffee
pro:sub part n
i'm drinking coffee .
aɪ m WORD_BOUNDARY d ɹ ɪ ŋ k ɪ ŋ WORD_BOUNDARY k ɔ f i WORD_BOUNDARY
i ' m WORD_BOUNDARY d r i n k i n g WORD_BOUNDARY c o f f e e WORD_BOUNDARY