EN
The author discusses Ewa Walusiak's proposal to distinguish three homogenous and synonymous language units belonging to three groups: prepositions, particles and conjunctions. It is argued that the criteria used by Walusiak do not allow for clear differentiation of the three groups. Therefore the author suggests an opposite hypothesis to be true: all of the language units in question belong to one and only one group of particles. The final part of the article is devoted to a preliminary semantic distinction between na dodatek, w dodatku, na dobitkę, na dobitek, na dokładkę and na domiar złego.