This paper aims investigating whether [V-어+지다], [V-어+하다] is the CP(complex predicates), which is the syntactic construction and has the unitary argument structure. All constructions of [V-어+지다] are syntactic because those allow of part- substitution. [Vt-어+지다] constructions are the CP which the argument structures of those, which don't be guessed by syntactic rules, are formed in the lexicon. [Vi-어+지다] and [Va-어+지다] constructions are the auxiliary verb constructions because the sentences that [Vi-어+지다] and [Va-어+지다] function as predicate are formed on the base of only argument structure of verbs preceding auxiliary verb ‘지다’. [V-어+하다] constructions is divided into the two classes. One is the class that ‘(-어)하다’ combines with V and the other is the class that ‘(-어)하다’ combines with ‘V-어하다’. The former is the compound verbs because of non-separability of the internal constituents of those and those idiosyncratic argument structures. The latter is the auxiliary verb constructions because the only argument structures of ‘V-어하다’ compound verbs preceding ‘(-어)하다’ participate in formalizing the sentence, although these are the syntactic constructions allow of part-substitution.
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