was klopft da unten an
was klopfen da unten an
pro v adv adv adv
was klopft da unten an ?
v a s WORD_BOUNDARY k l ɔ p f t WORD_BOUNDARY d aː WORD_BOUNDARY  ʊ n t ə n WORD_BOUNDARY  a n WORD_BOUNDARY
w a s WORD_BOUNDARY k l o p f t WORD_BOUNDARY d a WORD_BOUNDARY u n t e n WORD_BOUNDARY a n WORD_BOUNDARY