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gf-core/lib/src/abstract/Phrase.gf

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--1 Phrase: Phrases and Utterances
abstract Phrase = Cat ** {
-- When a phrase is built from an utterance it can be prefixed
-- with a phrasal conjunction (such as "but", "therefore")
-- and suffixing with a vocative (typically a noun phrase).
fun
PhrUtt : PConj -> Utt -> Voc -> Phr ; -- but come here, my friend
-- Utterances are formed from sentences, questions, and imperatives.
UttS : S -> Utt ; -- John walks
UttQS : QS -> Utt ; -- is it good
UttImpSg : Pol -> Imp -> Utt ; -- (don't) love yourself
UttImpPl : Pol -> Imp -> Utt ; -- (don't) love yourselves
UttImpPol : Pol -> Imp -> Utt ; -- (don't) sleep (polite)
-- There are also 'one-word utterances'. A typical use of them is
-- as answers to questions.
-- *Note*. This list is incomplete. More categories could be covered.
-- Moreover, in many languages e.g. noun phrases in different cases
-- can be used.
UttIP : IP -> Utt ; -- who
UttIAdv : IAdv -> Utt ; -- why
UttNP : NP -> Utt ; -- this man
UttAdv : Adv -> Utt ; -- here
UttVP : VP -> Utt ; -- to sleep
UttCN : CN -> Utt ; -- house
UttCard : Card -> Utt ; -- five
UttAP : AP -> Utt ; -- fine
UttInterj : Interj -> Utt ; -- alas
-- The phrasal conjunction is optional. A sentence conjunction
-- can also be used to prefix an utterance.
NoPConj : PConj ; -- [plain phrase without conjunction in front]
PConjConj : Conj -> PConj ; -- and
-- The vocative is optional. Any noun phrase can be made into vocative,
-- which may be overgenerating (e.g. "I").
NoVoc : Voc ; -- [plain phrase without vocative]
VocNP : NP -> Voc ; -- my friend
}