A question may be either a linguistic expression used to make a request for information, or else the request itself made by such an expression. This information is provided with an answer. Questions are normally put or asked using interrogative sentences. However they can also be put by imperative sentences, which normally express commands: “Tell me what two plus two is”; conversely, some expressions, such as “Would you pass the salt?”, have the grammatical form of questions but actually function as requests for action, not for answers, making them allofunctional.