tailieunhanh - Báo cáo khoa học: "Time and Tense in English"

To extract this temporal information from a sentence, it must be parsed into a semantic representation which captures the meaning of tense, temporal adverbs, and temporal connectives. Representations were developed for the basic tenses, some temporal adverbs, as well as some o f the temporal connectives. Five criteria were suggested for judging these representations, and based on these criteria the representations were judged. Introduction English sentences contain many types of temporal information. . | Time and Tense in English Mary p. Harper and Eugene Chamiak Brown University Department of Computer Science Box 1910 Providence RI02912 Abstract Tense temporal adverbs and temporal connectives provide information about when events described in English sentences occur. To extract this temporal information from a sentence it must be parsed into a semantic representation which captures the meaning of tense temporal adverbs and temporal connectives. Representations were developed for the basic tenses some temporal adverbs as well as some of the temporal connectives. Five criteria were suggested forjudging these representations and based on these criteria the representations were judged. Introduction English sentences contain many types of temporal information. Tense is used to inform the reader listener of when the event associated with the main verb occurs with repect to the time of utterance. That is tense informs the reader that an event occurs before after or during the time of utterance. Temporal adverbs such as tomorrow or now add additional information about the events in a sentence. Temporal connectives tell the reader about the temporal relationship between the events in the main clause and the events in the subordinate clause. While there is other temporal information that can be found in sentences the following will concentrate on these three. To extract temporal information from a sentence it must be parsed into a semantic representation which captures the meaning of tense temporal adverbs and temporal connectives. A temporal representation of tense adverbs and temporal connectives must 1. provide a way to reject temporally incorrect sentences such as I will run yesterday. 2. allow one to reason about the temporal relationship between events. For instance the sentence I had run when he arrived implies that the run event occurs before the arrival whereas in the sentence I was running when he arrived the arrival and run events overlap. 3. allow the exact time

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