In this article I present my definition of performative utterances in terms of locutionary, illocutionary and perlocutionary acts and in this respect I compare it with constative utterances. I also divide performative utterances into performative events and performative acts. In the following part of the paper, the felicity conditions of perfomative events and criteria assisting the qualification of the performative acts are recollected. Then all communicative behaviours of humans are divided into eight possible combinations of locutionary, illocutionary and perlocutionary acts. Some of them are classified as verbal and some as non-verbal human communicative behaviours.