A Lexical Perspective on Discourse Structure and Semantics Bonnie Webber School of Informatics University of Edinburgh Work carried out with Aravind Joshi (UPenn), Matthew Stone (Rutgers U), and Alistair Knott (U Otago), and members of the UPenn DL-TAG group (Nikhil Dinesh, Kate Forbes-Reilly, Alan Lee, Eleni Miltsakaki and Rashmi Prasad). 1