you mustn't do that
you must do that
pro:per mod v pro:dem
you mustn't do that .
j uː WORD_BOUNDARY m ʌ s ə n t WORD_BOUNDARY d uː WORD_BOUNDARY ð æ t WORD_BOUNDARY
y o u WORD_BOUNDARY m u s t n ' t WORD_BOUNDARY d o WORD_BOUNDARY t h a t WORD_BOUNDARY