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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)

      }