The word обязательно: grammar and pragmatics

The word обязательно ‘necessarily’ doesn’t belong to any particular part of speech. It is a pronouncedly pragmatic word which ‘pretends’ to be an adverb, an adjective or a category of state, functioning as a performative in directive and commissive speech acts. In different types of utterances this function manifests indirectly. Обя зательно may be called a non-descriptive adverb, taking into account its non-descriptive nature, on the one hand, and co-verbal (or co-predicative) position, on the other hand. The definition of this word and its classificatory beloning is performed on the basis of its compatibility and pragmatic.