Pragmatics

(a) Uttering words (morphemes, sentences) = performing utterance acts. (b) Referring and predicating = performing propositional acts. © Stating, questioning, commanding, promising, etc. = performing illocutionary acts.

characteristic grammatical form of the illocutionary act is the complete sentence (it can be a one-word sentence); and the characteristic grammatical form of the propositional acts are parts of sentences: grammatical predicates for the act of predication, and proper names, pronouns, and certain other sorts of noun phrases for reference.