# Tense, Polarity, and Anteriority

Last update: Sat Feb 25 22:35:57 2006
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This module defines the abstract parameters of tense, polarity, and anteriority, which are used in Tensed to generate different forms of sentences. Together they give 2 x 4 x 4 = 16 sentence forms. These tenses are defined for all languages in the library. More tenses can be defined in the language extensions, e.g. the passé simple of Romance languages.

        abstract Tense = {

          cat
            Pol ;
            Tense ;
            Ant ;

          fun
            PPos, PNeg : Pol ;                  -- I sleep/don't sleep
            TPres, TPast, TFut, TCond : Tense ; -- I sleep/slept/will sleep/would sleep
            ASimul, AAnter : Ant ;              -- I sleep/have slept

        }