Tense quantifiers, and contexts
Computational Linguistics - Special issue on tense and aspect
Temporal ontology and temporal reference
Computational Linguistics - Special issue on tense and aspect
A computational model of the semantics of tense and aspect
Computational Linguistics - Special issue on tense and aspect
Computational Linguistics - Special issue on tense and aspect
An episodic knowledge representation for narrative texts
Proceedings of the first international conference on Principles of knowledge representation and reasoning
A prosodic analysis of discourse segments in direction-giving monologues
ACL '96 Proceedings of the 34th annual meeting on Association for Computational Linguistics
Tense trees as the "fine structure" of discourse
ACL '92 Proceedings of the 30th annual meeting on Association for Computational Linguistics
Interpreting temporal adverbials
HLT '93 Proceedings of the workshop on Human Language Technology
EL: a formal, yet natural, comprehensive knowledge representation
AAAI'93 Proceedings of the eleventh national conference on Artificial intelligence
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Despite numerous investigations into English tense-aspect semantics, the problem of formally interpreting tense and aspect remains in large part unsolved. A formal solution requires (a) a well-defined mapping from a subset of English covering the most common tense-aspect constructions (including embedded tensed clauses) to a formal meaning representation, and (b) a well-defined denotational semantics for the meaning representation, which accords with speakers' intuitions about the original text. We propose a simple structure called a tense tree (or a set of connected tense trees) as a basis for interpreting tense-aspect constructions and some time adverbials in a context-dependent way. The de-indexicalization process simultaneously transforms tense trees and logical forms, the former in accord with simple recursion equations and the latter in accord with formal equivalences between context-indexed and context-independent logical forms. The rules have been implemented, and yield meaning representations in a formal episodic logic for narrative understanding.