The article deals with one type of subordinate clauses expressing causality, namely pronominal-particle clauses in the present Czech. The incorporation of these clauses into the head clause lies in the fact that they express broadly understood causal meanings of adverbial subordinate clauses using primary and secondary prepositions and multiple-word units together with the pronoun to, which anticipates the subordinate clause introduced by the connecting particles že, aby. Data from the Czech National Corpus concerning subordinate clauses of cause (reason), purpose, condition and concession are analysed from the point of view of the Czech language (grammar) system.