the teacher didn't understand
the teach do understand
det:art n mod v
the teacher didn't understand .
ð ə WORD_BOUNDARY t iː t̠ʃ ɚ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY ʌ n d ɚ s t æ n d WORD_BOUNDARY
t h e WORD_BOUNDARY t e a c h e r WORD_BOUNDARY d i d n ' t WORD_BOUNDARY u n d e r s t a n d WORD_BOUNDARY