Conceptually (see also The Fundamental Relations of Syntax and Conceptual Structure) the head of each sentence is a predicate ... Every head and predicate (events and states) must have at least one ...

(12) Who did John give what to? Both examples have similar argument structures, except for one feature: (13) WH Pol C S T ... V SOMETHING+[+WH\___] SOMEBODY+[-WH\___] (14) WH Pol C S T ... V ...