I didn't believe that
I do believe that
pro:sub mod v pro:dem
i didn't believe that .
aɪ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY b ɪ l iː v WORD_BOUNDARY ð æ t WORD_BOUNDARY
i WORD_BOUNDARY d i d n ' t WORD_BOUNDARY b e l i e v e WORD_BOUNDARY t h a t WORD_BOUNDARY