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--1 Adverb: Adverbs and Adverbial Phrases
abstract Adverb = Cat ** {
fun
-- The two main ways of forming adverbs are from adjectives and by
-- prepositions from noun phrases.
PositAdvAdj : A -> Adv ; -- warmly
PrepNP : Prep -> NP -> Adv ; -- in the house
-- Comparative adverbs have a noun phrase or a sentence as object of
-- comparison.
ComparAdvAdj : CAdv -> A -> NP -> Adv ; -- more warmly than John
ComparAdvAdjS : CAdv -> A -> S -> Adv ; -- more warmly than he runs
-- Adverbs can be modified by 'adadjectives', just like adjectives.
AdAdv : AdA -> Adv -> Adv ; -- very quickly
-- Subordinate clauses can function as adverbs.
SubjS : Subj -> S -> Adv ; -- when she sleeps
-- Comparison adverbs also work as numeral adverbs.
AdnCAdv : CAdv -> AdN ; -- less (than five)
}
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