they couldn't understand this
they could understand this
pro:sub mod v det:dem
they couldn't understand this .
ð eɪ WORD_BOUNDARY k ʊ d ə n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY ð ɪ s WORD_BOUNDARY
t h e y WORD_BOUNDARY c o u l d n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY t h i s WORD_BOUNDARY