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[PDF] TENSESTENSES. Tenses denote the time of action. They show when the work is done. They are: (1) Present Tense. (2) Past Tense. (3) Future Tense.缺少字詞： gl= tw[PDF] Tense or temporal logicA more complete overview of propositional tense logic can be found, e.g., in [Burgess,