... PROCESSING ENGLISH WITH A GENERALIZED PHRASE STRUCTURE GRAMMAR Jean Mark Gawron, Jonathan King, John Lamping, Egon Loebner, Eo Anne Paulson, Geoffrey K. Pullum, Ivan A. Sag, and Thomas Wasow Computer ... Geoffrey K. and Gerald Gazdar. 1982. Natural languages and context-free languages. Linguistics and phitos.ophy 4. Sag, Ivan A. 1982. "Coordination, Extraction, and Generalized Phrase Structure ... > are schemata that have rules as their instantiations when appropriate substitutions are made for the free variables. This metarule says that for every rule that expands a verb phrase as...