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 responsive as shown by the following examples.[1][2][3]
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.