(1) Locutionary speech act: the act of producing a meaningful linguistics expression is called locutionary act.
(2) Illocutionary speech act: the act of communication intention through the utterance is termed as illocutionary act.
(3) Perlocutionary speech act: the act of bring out an effect is known as perlocutionary act.
For example: If a teacher says, “I have run out of chalk” in the process of lecturing, the act of saying is locutionary, the act of demanding for chalk is illocutionary, and the effect the utterance brings about – one of the students will go and get some chalk – is perlocutionary.