--1 Idiomatic expressions

abstract Idiom = Cat ** {

-- This module defines constructions that are formed in fixed ways,
-- often different even in closely related languages.

  fun
    ExistNP  : NP -> Cl ;  -- there is a house
    ImpersVP : VP -> Cl ;  -- it rains
    ProgrVP  : VP -> VP ;  -- sleeping

}