Responsive predicate

In formal semantics a responsive predicate is an embedding predicate which can take either a declarative or an interrogative complement. For instance, the English verb "know" is reponsive as shown by the following examples.
Responsives are contrasted with "rogatives" such as "wonder" which can only take an interrogative complement and "anti-rogatives" such as "believe" which can only take a declarative complement.
Some analyses have derived these distinctions from type compatibility while others explain them in terms of particular properties of the embedding verbs and their complements.