IRCS Technical Reports Series

Document Type

Technical Report

Date of this Version

March 1995


University of Pennsylvania Institute for Research in Cognitive Science Technical Report No. IRCS-95-03.


This document describes a sizable grammar of English written in the TAG formalism and implemented for use with the XTAG system. This report and the grammar described herein supersedes the TAG grammar described in [Abeille` et al., 1990]. The English grammar described in this report is based on the TAG formalism developed [Joshi et al., 1975] which has been extended to include lexicalization ([Schabes et al., 1988]), and unification-based feature structures ([Vijay Shanker and Joshi, 1991]). The grammar discussed in this report extends the grammar presented in [Abeille` et al., in at least two ways. First, this grammar has more detailed linguistic analyses, and second, the grammar presented in this paper is fully implemented. The range of syntactic phenomena that can be handled is large and includes auxiliaries (including inversion), copula, raising and small clause constructions, topicalization, relative clauses, infinitives, gerunds, passives, adjuncts, it-clefts, wh-clefts, PRO contructions, noun-noun modifications, extraposition, determiner phrases, genitives, negation, noun-verb contractions, sentential adjuncts and imperatives. The XTAG grammar has been relatively stable since November 1993, although new analyses are still being added periodically.



Date Posted: 14 September 2006