we found frog haven't we
we find frog have we
pro:sub v n aux pro:sub
we found frog haven't we?
w iː WORD_BOUNDARY f aʊ n d WORD_BOUNDARY f ɹ ɒ ɡ WORD_BOUNDARY h æ v ə n tʰ WORD_BOUNDARY w iː WORD_BOUNDARY
w e WORD_BOUNDARY f o u n d WORD_BOUNDARY f r o g WORD_BOUNDARY h a v e n ' t WORD_BOUNDARY w e ? WORD_BOUNDARY