was muss er dann
was müssen er dann
pro mod pro:per adv
was muss er dann ?
v a s WORD_BOUNDARY m ʊ s WORD_BOUNDARY  ɛ ɐ WORD_BOUNDARY d a n WORD_BOUNDARY
w a s WORD_BOUNDARY m u s s WORD_BOUNDARY e r WORD_BOUNDARY d a n n WORD_BOUNDARY