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