how did that happen
how do that happen
pro:int mod pro:rel v
how did that happen ?
h aʊ WORD_BOUNDARY d ɪ d WORD_BOUNDARY ð æ t WORD_BOUNDARY h æ p ə n WORD_BOUNDARY
h o w WORD_BOUNDARY d i d WORD_BOUNDARY t h a t WORD_BOUNDARY h a p p e n WORD_BOUNDARY