The dependent category covers more than finite verbs. Participles, other derivatives, and particles are also discussed under it.
In verbs and derivatives, the analysis often begins with the meaning of an underlying action or quality. In a particle, however, we do not have an independently denoted agent or event: the significant element is a relation or attachment between meanings.
These expressions are grouped because their metaphoric transfer depends on something beyond a self-contained generic noun, even though their grammatical structures are not alike.