# Infrastructure with common implementations.

Last update: Sat Feb 25 22:35:54 2006
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Produced by gfdoc - a rudimentary GF document generator. (c) Aarne Ranta (aarne@cs.chalmers.se) 2002 under GNU GPL.

This module defines the abstract parameters of tense, polarity, and anteriority, which are used in Phrase 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 Common = {

          cat
            Text ;   -- text consisting of several phrases
            Phr ;    -- phrase in a text                    e.g. "But come here my darling."

            Pol ;
            Tense ;
            Ant ;

          fun
            PPos, PNeg : Pol ;             -- I sleep/don't sleep

            TPres  : Tense ;
            ASimul : Ant ;
            TPast, TFut, TCond : Tense ;   -- I slept/will sleep/would sleep --# notpresent
            AAnter : Ant ;                 -- I have slept                   --# notpresent

        }