Tense and Aspect Assignment in Narrative Discourse David Elson author Kathleen McKeown author 2010-07 text Proceedings of the 6th International Natural Language Generation Conference John Kelleher editor Brian Mac Namee editor Ielka van der Sluis editor Association for Computational Linguistics conference publication elson-mckeown-2010-tense https://aclanthology.org/W10-4205/ 2010-07