we did didn't we
we do do we
pro:sub v mod pro:sub
we did didn't we?
w iː WORD_BOUNDARY d ɪ d WORD_BOUNDARY d ɪ d n tʰ WORD_BOUNDARY w iː WORD_BOUNDARY
w e WORD_BOUNDARY d i d WORD_BOUNDARY d i d n ' t WORD_BOUNDARY w e ? WORD_BOUNDARY