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# Common: Structures with Common Implementations.

This module defines the abstract parameters of tense, polarity, and anteriority, which are used in [``Phrase`` Phrase.html] to generate different forms of sentences. Together they give 4 x 2 x 2 = 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 passe simple of Romance languages in [``ExtraRomance`` ../romance/ExtraRomance.gf].

      abstract Tense = Common ** {

        fun
          TTAnt : Tense -> Ant -> Temp ;

          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
      }