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A rhetorical question is a figure of speech in the form of a question that is asked to make a point rather than to elicit an answer. Though classically stated as a proper question, such a rhetorical device  by implying a question, and therefore may not always require a question mark when written. Though a rhetorical question does not require a direct answer, in many cases it may be intended to start a discussion or at least draw an acknowledgement that the listener understands the intended message.
A common example is the question "Can't you do anything right?" This question, when posed, is intended not to ask about the listener's abilities, but rather to insinuate a lack of the listener's abilities.
Although sometimes amusing and even humorous, rhetorical questions are rarely meant for pure, comedic effect.
A rhetorical question intended as a challenge... the question is difficult or impossible to answer. In the example, What have the Romans ever done for us? (Monty Python's Life of Brian) the question functions as a negative assertion. It is intended to mean -The Romans have never done anything for us!-. When Shakespeare's Mark Antony exclaims: Here was a Caesar! when comes such another? it functions as an assertion that Caesar possesses such rare qualities they may never be seen again.(Julius Caesar, Act 3, scene 2, 257)
Negative assertions may function as positives in sarcastic contexts. For example, Smoking can lead to lung cancer. Who knew?! the question functions as an assertion that the truth of the statement should have been utterly obvious.
Rhetorical questions as metaphors
One common form is where a rhetorical question is used as a metaphor for a question already asked. There are more examples that may be found in the song Maria from the 1959 Rodgers and Hammerstein musical, The Sound of Music, in which the How do you solve a problem like Maria? is repeatedly answered with another question: How do you catch a cloud and pin it down?, How do you keep a wave upon the sand? and How do you hold a moonbeam in your hand? These responses may be taken as asserting that "the problem of Maria" cannot be solved; and furthermore the choice of cloud, wave and moonbeam as metaphors for Maria give insight into her character and the nature of the problem.
In the vernacular, this form of rhetorical question is most often seen as rhetorical affirmation, where the certainty or obviousness of the answer to a question is expressed by asking another, often humorous, question for which the answer is equally obvious; popular examples include Does a bear shit in the woods?, Is the sky blue? and Is the Pope Catholic?
Sometimes the implied answer to a rhetorical question is "Yes, but I wish it were not so" or vice versa:
- O mighty Caesar! dost thou lie so low?
- Are all thy conquests, glories, triumphs, spoils,
- Shrunk to this little measure?
- (Shakespeare, Julius Caesar, III.i.148)
Another common form is the expression of doubt by questioning a statement just made; for example by appending the following to a sentence: or did he?, or is it?, etc.
- The butler did it... or did he?
It is also common to use a rhetorical question to bring an end to a debate or to finalize a decision. For example, when internally deciding whether to perform an action, one may shove aside the dialogue with a simple, "Eh, why not?" or "What the heck?"
• Grammar • Depending on the context, a rhetorical question may be punctuated by a question mark (?), full stop (.), or exclamation mark (!), but some sources argue that it is required to use a question mark for any question, rhetorical or not.
Rhetorical questions may be signaled by marker phrases; questions that include "after all", or "by any chance" may be intended as rhetorical.
Written lists of rhetorical questions within a sentence require question marks, but do not require quotation marks. "Would he? Could he? Should he? she asked." 
In the 1580s, English printer Henry Denham invented a "rhetorical question mark" for use at the end of a rhetorical question; however, it died out of use in the 17th century. It was the reverse of an ordinary question mark, so that instead of the main opening pointing back into the sentence, it opened away from it.
"The effectiveness of rhetorical questions in argument comes from their dramatic quality. They suggest dialogue, especially when the speaker both asks and answers them himself, as if he were playing two parts on the stage. They are not always impassioned; they may be mildly ironical or merely argumentative: but they are always to some extent dramatic, and, if used to excess, they tend to give one’s style a theatrical air."
"Rhetorical questioning is…a fairly conscious technique adopted by a speaker for deliberate ends, and it is used infrequently, proportional to the length of the dialogue, oration, or conversation."
- Hypothetical question
- Suggestive question
- Complex question
- Double-barreled question
- Loaded question
- No such thing as a stupid question
- Performative contradiction
- Betteridge's law of headlines
- Gideon O. Burton, Brigham Young University. "Rhetorical questions". specialized language definitions. Retrieved 2007-10-19.
- Powell, Chris; Paton, George E. C. (1988). Humour in society: resistance and control. Macmillan. p. 67. ISBN 0-333-44070-6.
- Moon, Rosamund (1998). Fixed expressions and idioms in English: a corpus-based approach (Oxford studies in lexicography and lexicology). Oxford University Press. p. 158. ISBN 0-19-823614-X.
- Fergusson, Rosalind; Partridge, Eric (1994). Shorter dictionary of catch phrases. Routledge. p. 25. ISBN 0-415-10051-8.
- http://www.whitesmoke.com/punctuation-question-mark.html#rhe Whitesmoke
- Javier Gutiérrez Rexach, "Rhetorical Questions, Relevance and Scales", Ohio State University, 1998
- 6.126 and 6.56 Chicago Manual of Style 15th ed. 2003, University of Chicago Press.
- Truss, Lynne. Eats, Shoots & Leaves, 2003. p. 142. ISBN 1-59240-087-6.
- Gardiner, J (1907). "Manual of Composition and Rhetoric". Ginn & Company. Retrieved 23 April 2011.
- Boyd, Boyd (1997). Electronic Discourse: Linguistics Individuals in Virtual Space. Albany: State University of New York Press.
|Look up rhetorical question in Wiktionary, the free dictionary.|
- What is a rhetorical question?
- Audio illustrations of the rhetorical question
- A short definition of the term
- Paul Brians, Washington State University. "Common Errors in English". Grammatical Errors in the English Language. Retrieved 2007-10-19.
- Roger Kruez, Aaron Ashley, and Kathryn Bartlett, University of Memphis. "Twisting Arms: Figurative Language Effects in Persuasive Discourse" (PDF). psychology research paper. Retrieved 2008-03-27.