POS Tagging of English Particles for Machine Translation Jianjun Ma author Degen Huang author Haixia Liu author Wenfeng Sheng author 2011-sep 19-23 text Proceedings of Machine Translation Summit XIII: Papers Xiamen, China conference publication ma-etal-2011-pos https://aclanthology.org/2011.mtsummit-papers.4/ 2011-sep 19-23