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 ə ɹ WORD_BOUNDARY d ɪ d n t WORD_BOUNDARY ʌ n d ə ɹ 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