Intraverbals are a part of verbal behavior that lead to conversation. Basically, anytime a speaker responds differentially to verbal behavior of another person it can be considered an intraverbal (Cooper, Heron, & Heward, 2007). One of the first ways intraverbals emerge in a repertoire is by using fun fill ins such as “1,2 __!” or “ready, set, __!”. Then you can move forward with answering simple questions, learning general knowledge questions, and engaging in conversational behavior.
Cooper, J., Heron, T.E, & Heward, W.L. (2007). Applied behavior analysis (2nd Ed.). Upper Saddle River, NJ: Pearson Education.