As regards their meaning, particles may be arranged in classes, e.g adversative, affirmative, asseverative, concessive, confirmative, conjunctive, infer
ential, intensive, interrogative, limitative, negative, etc. These classes cannot always be sharply distinguished: some particles fall under two or more classes Many particles, which serve to set forth the logical relation between clauses, have originally only an intensive or confirmatory force that was confined to their own clause. The following sections deal only with the commoner uses of the most noteworthy particles.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].