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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
Like adverbs, adadjectives can be produced by adjectives. 
      PositAdAAdj : A -> AdA ;                 -- extremely
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)
  
  }