The voice category, being one of the main verbal categories in a language, is traditionally considered to be discrete. It means that if there are two voice forms (active and passive) in a language, a verbal form may belong either to the active or to the passive voice; if there are three kinds of voice forms (active, passive and medium), then a verbal form may belong to one of these three. There is no unitary definition of the category, and even main points of the existing definitions (what determines the discrete nature of the category) are not homogeneous.
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