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gf-rgl/src/abstract/Tense.gf

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--1 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 ; -- [combination of tense and anteriority, e.g. past anterior]
PPos : Pol ; -- I sleep [positive polarity]
PNeg : Pol ; -- I don't sleep [negative polarity]
TPres : Tense ; -- I sleep/have slept [present]
ASimul : Ant ; -- I sleep/slept [simultaneous, not compound]
TPast : Tense ; -- I slept [past, "imperfect"] --# notpresent
TFut : Tense ; -- I will sleep [future] --# notpresent
TCond : Tense ; -- I would sleep [conditional] --# notpresent
AAnter : Ant ; -- I have slept/had slept [anterior, "compound", "perfect"] --# notpresent
}