Volitive moods are a category of grammatical moods that are used to express volitive modality. There is no inflection for a subjunctive or volitive. The differences between volitive and involitive verbs are apparent through their morphology and phonology. In (a) the theta role assigned by the volitive verb is an agent. Generally, interjections can be classified into three types of meaning&colon; volitive, emotive, or cognitive.