EN
The article is devoted to semantic and grammatical description of two of the four strenghtening particles: żeby było_ and co_. These are very interesting language units, not attested in dictionaries, the only ones in the group of particles containing valency positions. Despite the semantic similarity between them and the two other items of the group - tym bardziej and co dopiero - they tend to occur in different sentence structures, i.e. containing joint conjuctions, restrictive or analogy particles. They do not occur in the context of non-assertive sentences. This paper considers the type of structure formed by the examined language units, the possibilities of filling their valency positions and, in result, their meaning.