The University of Pennsylvania Working Papers in Linguistics (PWPL) is an occasional series published by the Penn Linguistics Club, the graduate student organization of the Linguistics Department of the University of Pennsylvania. The series has included volumes of previously unpublished work, or work in progress, by linguists with an ongoing affiliation with the Department, as well as volumes of papers from the NWAV conference and the Penn Linguistics Colloquium. The current PWPL series editors are Lukasz Abramowicz, Sudha Arunachalam, Maciej Baranowski, Lucas Champollion, Aaron Dinkin, Suzanne Evans Wagner, Michael Friesner, Jonathan Gress-Wright, Damien Hall, Uri Horesh, Ian Ross, Tatjana Scheffler, Sandhya Sundaresan, and Joshua Tauberer. This volume contains the proceedings of the 28th Annual Penn Linguistics Colloquium, held from February 27 to 29, 2004, at the University of Pennsylvania in Philadelphia.