predicates, arguments

 - elements that require the specification of the participants (argument) in the proposition expressed

internal argument
 - argument inside VP

external argument
 - argument outside VP = Subject NP

semantic notion                  syntactic notion
one-place predicate                       intransitive V
two-place predicat            =            transitive V
three-place predicate                     ditransitive V

Predicate, Predicator - functional term
predicate - semantic term

argument structure
 - each predicate is associated with a unique argument structure which specifies the number of arguments a predicate take and their categorial status

not only a verb can be predicates