The University of Pennsylvania Working Papers in Linguistics (PWPL) is an occasional series published by the Penn Graduate Linguistics Society. The series has included volumes of previously unpublished work, or work in progress, by linguists with an ongoing affiliation with the Department, as well as volumes of papers from NWAV and the Penn Linguistics Colloquium/Conference. This volume contains selected papers from the 39th Penn Linguistics Conference, held from March 20-25, 2015 in Philadelphia, PA, at the University of Pennsylvania. Thanks go to Hezekiah Bacovcin, Tad Bezerra, Haitao Cai, Spencer Caplan, Andrea Ceolin, Nattanun Chanchaochai, Mao-Hsu Chen, Ava Creemers, Aletheia Cui, Amy Goodwin Davies, Kajsa Djarv, Sabriya Fisher, Duna Gylfadottir, Helen Jeoung, Taylor Jones, Jordan Kodner, Wei Lai, Catlin Richter, Milena Šereikaitė, Einar Freyr Sigurðsson, Betsy Sneller, Jia Tian, Robert Wilder, and Hong Zhang for their help in editing. Since Vol. 14.2, PWPL has been an internet-only publication. As of September 2014, the entire back catalog has been digitized and made available on ScholarlyCommons@Penn. Please continue citing PWPL papers or issues as you would a print journal article, though you may also provide the URL of the manuscript. An example is below: Cho, Sunghye. 2016. The ɨ Deletion Rule and Phonologically Conditioned Allomorphy in Korean Case Markers. In University of Pennsylvania Working Papers in Linguistics 22.1, ed. Sunghye Cho, 81-90. Available at: http://repository.upenn.edu/pwpl/vol22/iss1/10 Publication in the University of Pennsylvania Working Papers in Linguistics (PWPL) does not preclude submission of papers elsewhere; copyright is retained by the author(s) of individual papers. The PWPL editors can be contacted at: U. Penn Working Papers in Linguistics 619 Williams Hall, University of Pennsylvania Philadelphia, PA 19104–6305 working-papers@ling.upenn.edu http://ling.upenn.edu/papers/pwpl.html Sunghye Cho, Issue Editor