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We describe the generation of communicative actions in an implemented embodied conversational agent. Our agent plans each utterance so that multiple communicative goals may be realized opportunistically by a composite action including not only speech but also coverbal gesture that fits the context and the ongoing speech in ways representative of natural human conversation. We accomplish this by reasoning from a grammar which describes gesture declaratively in terms of its discourse function,doi:10.3115/1118253.1118277 dblp:conf/inlg/CassellSY00 fatcat:k3bbz2rpqrhkpbjw3vu33tmxie