This book defends in part a particular elaboration of the stylistic rule component of the grammatical model first presented in Chomsky and Lasnik (1977). It is argued that stylistic rules share a number of fundamental properties, most significantly that they characterize noncanonical focusing constructions and that they make no contribution to the logical forms (LFs) of sentences they apply to in particular regard to truth conditional interpretation. The work includes a discussion of Auxiliary Inversion constructions in English, arguing that these constructions also sometimes involve focusing, though not stylistic. An approach to the interpretation of these sentences is suggested, employing a concept of interpretative templates: rules relating S-structure and LF for which some independent evidence is suggested.