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In this talk I will present our research toward modeling socio-emotional behaviors for virtual agent, focusing on communicative acts, emotions, and social attitudes. I will cover the relation between mental states and nonverbal behaviors as well as their realization in an embodied conversational agent. I will also present an architecture that allows virtual agent to adapt to user’s nonverbal behaviors during a dyadic interaction. I will focus on three studies that look at different levels of adaptation mechanisms: conversational strategy, nonverbal behaviors, signals.