If it may have happened before, it happened, but not necessarily before Albert Gatt author François Portet author 2011-09 text Proceedings of the 13th European Workshop on Natural Language Generation Claire Gardent editor Kristina Striegnitz editor Association for Computational Linguistics Nancy, France conference publication gatt-portet-2011-may https://aclanthology.org/W11-2812/ 2011-09 91 101