what's happened to them
what happen to them
pro:int part prep pro:obj
what's happened to them?
w ɒ tʰ s WORD_BOUNDARY h æ pʰ ə n d WORD_BOUNDARY tʰ ə WORD_BOUNDARY ð e m WORD_BOUNDARY
w h a t ' s WORD_BOUNDARY h a p p e n e d WORD_BOUNDARY t o WORD_BOUNDARY t h e m ? WORD_BOUNDARY