how often does it happens
how often do it happen
pro:rel adv mod pro:per v
how often does it happens ?
h aʊ WORD_BOUNDARY ɔ f ə n WORD_BOUNDARY d ʌ z WORD_BOUNDARY ɪ t WORD_BOUNDARY h æ p ə n z WORD_BOUNDARY
h o w WORD_BOUNDARY o f t e n WORD_BOUNDARY d o e s WORD_BOUNDARY i t WORD_BOUNDARY h a p p e n s WORD_BOUNDARY