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Considering this, what is an example of a rhetorical question?

A rhetorical question is a question (such as "How could I be so stupid?") that's asked merely for effect with no answer expected. The answer may be obvious or immediately provided by the questioner.

what is rhetorical question in figure of speech? A rhetorical question is a figure of speech in which a question is asked for a reason other than to get an answer—most commonly, it's asked to make a persuasive point. Rhetorical questions are a type of figurative language—they are questions that have another layer of meaning on top of their literal meaning.

Secondly, how do you turn a rhetorical question into a statement?

In a standard English yes-or-no question, the verb precedes the subject, often a helping verb like “is,” “must” or “can.” If the question is not yes-or-no, it begins with a question word, like “who,” “what,” “when” or “where.” To turn a question into a statement, remove the question word and put the sentence into

Do I need to put a question mark after a rhetorical question?

Rhetorical questions can be ended with either a question mark, an exclamation mark or a period. Using a question mark is probably the most common choice, but it is really up to the writer to use whatever punctuation matches best the intent of the rhetorical question.