Are the grammars so far developed appropriate to recognize the real structure of a sentence? Makoto Nagao author 1992-jun 25-27 text Proceedings of the Fourth Conference on Theoretical and Methodological Issues in Machine Translation of Natural Languages Montréal, Canada conference publication nagao-1992-grammars https://aclanthology.org/1992.tmi-1.11/ 1992-jun 25-27