what happened what happened
what happen what happen
pro:int v pro:int v
what happened what happened ?
w ʌ t WORD_BOUNDARY h æ p ə n d WORD_BOUNDARY w ʌ t WORD_BOUNDARY h æ p ə n d WORD_BOUNDARY
w h a t WORD_BOUNDARY h a p p e n e d WORD_BOUNDARY w h a t WORD_BOUNDARY h a p p e n e d WORD_BOUNDARY