My article examines the permeability of composite dubitative forms in the active and passive voice in modern Bulgarian. I distinguish two cases: permeability from short dative and accusative personal pronouns, as well as permeability from particles, inserted remarks, adverbs, and simple sentences. In addition, I provide an overview of specific and generalised models of permeability. The conclusions I draw highlight both the common and unique features of the permeability of composite dubitative forms. To substantiate this, I rely on examples obtained from language corpora and the internet, encompassing short personal pronouns, adverbs, particles, inserts, simple sentences, as well as composite forms where permeability is not feasible.
Keywords: penetrability, dubitative, compound verb forms, active voice, passive voice, accusative personal short forms, dative personal short forms, adverbs, particles, inserts (inserted remarks)

