Exploring Difficulties in Parsing Imperatives and Questions Tadayoshi Hara author Takuya Matsuzaki author Yusuke Miyao author Jun’ichi Tsujii author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication hara-etal-2011-exploring https://aclanthology.org/I11-1084/ 2011-11 749 757