Conjunctions may be defined as: forming a '[c]losed lexical category, or a lexical item belonging to this category, whose members serve to construct coordinate structures, such as "and", "or" and "but" in English' (Trask 1993: 56). In this grammar, however, we retain the traditional approach, including conjunctions, or 'subordinators', which introduce subordinate clauses. Conjunctions thus cover a rather diffuse area, from linking elements of simple sentences to linking the clauses of composite sentences.