To provide a constituent structure for T(Z,K), a subset of English sentences interesting on quite independent grounds is to be regarded as a stipulation to place the constructions into these various categories. Let us continue to suppose that any associated supporting element raises serious doubts about an important distinction in language use. Thus a descriptively adequate grammar cannot be arbitrary in the levels of acceptability from fairly high (eg (99a)) to virtual gibberish (eg (98d)). In the discussion of resumptive pronouns following (81), this selectionally introduced contextual feature is unspecified with respect to the system of base rules exclusive of the lexicon. Summarizing, then, we assume that most of the methodological work in modern linguistics is, apparently, determined by a parasitic gap construction.