what I don't understand is this
what I do understand be this
pro:int pro:sub mod v aux pro:dem
what i don't understand is this .
w ɒ t WORD_BOUNDARY aɪ WORD_BOUNDARY d əʊ n t WORD_BOUNDARY ʌ n d ə s t a n d WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ɪ s WORD_BOUNDARY
w h a t WORD_BOUNDARY i WORD_BOUNDARY d o n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY i s WORD_BOUNDARY t h i s WORD_BOUNDARY