EDITORS IN CHIEF Jen Ting, National Taiwan Normal University Shiao-hui Chan, National Taiwan Normal University ADVISORY BOARD Chin-chuan Cheng, Academia Sinica Peter Cole, University of Delaware C.-T. James Huang, Harvard University Shuanfan Huang, Yuan Ze University Paul Jen-kuei Li, Academia Sinica Yen-hui Audrey Li, University of Southern California Marie-Claude Paris, Université Denis Diderot (Paris 7) Malcolm Ross, Australian National University James H.-Y. Tai, National Chung Cheng University Chiu-yu Tseng, Academia Sinica H. Samuel Wang, Yuan Ze University EDITORIAL BOARD Zhiming Bao, National University of Singapore Miao-Hsia Chang, National Taiwan Normal University Lindsey Chen, National Taiwan Normal University Su-chiao Chen, National Taiwan University of Science and Technology Hintat Cheung, Hong Kong Institute of Education Raung-fu Chung, Southern Taiwan University Shu-kai Hsieh, National Taiwan University Hui-chuan J. Huang, Academia Sinica Lillian M. Huang, Shih Chien University Zhuo Jing-Schmidt, University of Oregon Huei-ling Lai, National Chengchi University Hongyin Tao, University of California, Los Angeles Niina Ning Zhang, National Chung Cheng University COPY EDITOR Graeme Todd, National Taiwan Normal University EDITORIAL ASSISTANTS Wei-Ling Chen, Yi-Ting Huang, Kuan Hsien Jiang, Jia-Chen Lin Logo designed by Hoo-Jer Jen The issue is partly funded by the Research Institute for the Humanities and Social Sciences, Ministry of Science and Technology. The journal has been covered in Clarivate Analytics services (formerly the Intellectual Property & Science business of Thomson Reuters) and included in ESCI (Emerging Sources Citation Index) since 2016. All correspondences should be addressed to Concentric: Studies in Linguistics Department of English, National Taiwan Normal University No. 162, Sec. 1, Heping E. Road, Taipei City 10610, Taiwan Phone: +886-2-77341796 Fax: +886-2-23634793 E-mail: [email protected] Website: http://www.concentric-linguistics.url.tw/ ISSN 1810-7478 print © 2018, Department of English, National Taiwan Normal University. All rights reserved. .