This paper explores the complex relationship between the meaning of predicates and the morphosyntactic expression of their arguments, as manifested in the swarm-class alternations in Czech. One way of getting at the nature of the alternations is to take a frame-semantic approach, which allows us to introduce the notion of scene as an important factor in linking relationships. It is proposed that linking patterns are organized in a network of generalized scene types, each of which represents a particular role configuration (...) structured in such a way that one of its roles can be singled out as the vantage point from which that event type is conventionally presented in a particular diathesis; the analysis argues for the notion of viewpoint as an event-structuring concept (distinct from discourse-based topicness) that is directly reflected in certain conventionalized linking patterns. The results of the investigation show that what may appear to be hard-to-predict variations in subject selection can be treated as instances of regular linking relations. (shrink)