PRED (predication) is a functor for the effective root of an independent verbal clause, which is not a parenthesis.
PRED functor is assigned to the node representing the governing verb (predicate) of an independent verbal clause, if it is not a parenthesis. Independent verbal clauses are defined in Section 4.1, "Verbal clauses". The same section also describes the possible forms of the governing predicate, which is represented by a node with the
PRED kytku Marii. (=lit. Paul gave a_flower to_Mary.) Fig. 7.1
For more examples see Section 4.1, "Verbal clauses".