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--1 Sentence: Sentences, Clauses, and Imperatives
abstract Sentence = Cat ** {
--2 Clauses
-- The $NP VP$ predication rule form a clause whose linearization
-- gives a table of all tense variants, positive and negative.
-- Clauses are converted to $S$ (with fixed tense) with the
-- $UseCl$ function below.
fun
PredVP : NP -> VP -> Cl ; -- John walks
-- Using an embedded sentence as a subject is treated separately.
-- This can be overgenerating. E.g. "whether you go" as subject
-- is only meaningful for some verb phrases.
PredSCVP : SC -> VP -> Cl ; -- that she goes is good
--2 Clauses missing object noun phrases
-- This category is a variant of the 'slash category' $S/NP$ of
-- GPSG and categorial grammars, which in turn replaces
-- movement transformations in the formation of questions
-- and relative clauses. Except $SlashV2$, the construction
-- rules can be seen as special cases of function composition, in
-- the style of CCG.
-- *Note* the set is not complete and lacks e.g. verbs with more than 2 places.
SlashVP : NP -> VPSlash -> ClSlash ; -- (whom) he sees
AdvSlash : ClSlash -> Adv -> ClSlash ; -- (whom) he sees today
SlashPrep : Cl -> Prep -> ClSlash ; -- (with whom) he walks
SlashVS : NP -> VS -> SSlash -> ClSlash ; -- (whom) she says that he loves
--2 Imperatives
-- An imperative is straightforwardly formed from a verb phrase.
-- It has variation over positive and negative, singular and plural.
-- To fix these parameters, see [Phrase Phrase.html].
ImpVP : VP -> Imp ; -- love yourselves
--2 Embedded sentences
-- Sentences, questions, and infinitival phrases can be used as
-- subjects and (adverbial) complements.
EmbedS : S -> SC ; -- that she goes
EmbedQS : QS -> SC ; -- who goes
EmbedVP : VP -> SC ; -- to go
--2 Sentences
-- These are the 2 x 4 x 4 = 16 forms generated by different
-- combinations of tense, polarity, and
-- anteriority, which are defined in [``Common`` Common.html].
fun
UseCl : Temp -> Pol -> Cl -> S ;
UseQCl : Temp -> Pol -> QCl -> QS ;
UseRCl : Temp -> Pol -> RCl -> RS ;
UseSlash : Temp -> Pol -> ClSlash -> SSlash ;
-- An adverb can be added to the beginning of a sentence.
AdvS : Adv -> S -> S ; -- today, I will go home
-- A sentence can be modified by a relative clause referring to its contents.
RelS : S -> RS -> S ; -- she sleeps, which is good
}
--.
-- Examples for English $S$/$Cl$:
{-
Pres Simul Pos ODir : he sleeps
Pres Simul Neg ODir : he doesn't sleep
Pres Anter Pos ODir : he has slept
Pres Anter Neg ODir : he hasn't slept
Past Simul Pos ODir : he slept
Past Simul Neg ODir : he didn't sleep
Past Anter Pos ODir : he had slept
Past Anter Neg ODir : he hadn't slept
Fut Simul Pos ODir : he will sleep
Fut Simul Neg ODir : he won't sleep
Fut Anter Pos ODir : he will have slept
Fut Anter Neg ODir : he won't have slept
Cond Simul Pos ODir : he would sleep
Cond Simul Neg ODir : he wouldn't sleep
Cond Anter Pos ODir : he would have slept
Cond Anter Neg ODir : he wouldn't have slept
-}
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