hasn't been used but
have be use but
aux aux part conj
hasn't been used but .
h æ z ə n t WORD_BOUNDARY b ɪ n WORD_BOUNDARY j uː z d WORD_BOUNDARY b ʌ t WORD_BOUNDARY
h a s n ' t WORD_BOUNDARY b e e n WORD_BOUNDARY u s e d WORD_BOUNDARY b u t WORD_BOUNDARY