Author: Bresnan, Joan. Date: February 18, 1999 Title: Explaining Morphosyntactic Competition Email: bresnan@stanford.edu Format: postscript Remarks: To appear in Handbook of Contemporary Syntactic Theory, ed. by Mark Baltin and Chris Collins. Oxford: Blackwell Publishers. Final revision, February 18, 1999. 49 pages (postscript). Available on the Rutgers Optimality Archive: (ROA-299-0299). Abstract: I compare lexical blocking theories with OT constraint ranking in morphosyntax, focusing on the morphosyntax of negation in several English dialects, including Standard English, Scots English, and Hiberno-English.