(By Hannah J. Haynie): "Interrogative verbs are verbs that include a semantic wh-element. In other words, the semantic content of interrogative verb roots includes an element equivalent to a content question, with meanings such as, ‘to do what’ or ‘to be who’. The wh-element must behave like a verb in the language. In English, for example, it would require regular verbal morphology, as in, You what-ed yesterday? (meaning, ‘what did you do yesterday?’). The feature does not include verbs of asking (e.g. English ask, inquire) or interrogative forms created through affixation of interrogative markers to non-interrogative verb roots."