what did we sing
what do we sing
pro:int mod pro:sub v
what did we sing ?
w ʌ t WORD_BOUNDARY d ɪ d WORD_BOUNDARY w iː WORD_BOUNDARY s ɪ ŋ WORD_BOUNDARY
w h a t WORD_BOUNDARY d i d WORD_BOUNDARY w e WORD_BOUNDARY s i n g WORD_BOUNDARY