Abstract
We present an approach that extends Sowa's conceptual graph approach for modelling temporal information found in discourses, thanks to the introduction of the notion of time coordinate systems in the form of agents' perspectives and temporal localizations. Several types of temporal situations (states, events, processes, etc.) may be represented. They are related together and linked to temporal perspectives and localizations by means of temporal relations. We show how these notions may be used to determine verb tenses in a discourse semantically represented by our temporal model. First, we present basic rules to determine verb tenses for independent clauses. Then, we examine how different structures (temporal localizations, temporal objects, etc.) modify these rules. We also consider verb tense determination rules for complex sentences (composed of a main clause and a subordinate clause). Finally, we present a method for applying these verb determination rules to a discourse temporal model.
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