Structural groups in Systemic Functional Linguistics include nominal groups, verbal groups, adjectival groups, adverbial groups, and prepositional phrases. These groups perform functional slots of subject, object, predicator, adjunct, or complement. Nominal groups function as subjects, objects, or complements. Verbal groups function as predicators. Adjectival groups function as complements. Adverbial groups and prepositional phrases function as adjuncts. Together, structural groups and functional slots provide a framework for analyzing the grammar of clauses.