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Question Mark, has the graphic symbol (?) is used to indicate a question or doubt. Its use is necessary for the sentence to be understood as interrogative. In texts written in the language of Roman origin, without the use of the question mark, the sentence has its meaning changed, becoming an affirmation. When it comes to direct sentences, the "?" must be used. However, in indirect clauses, it is replaced by the period. The interrogative pronouns que and quem are invariable, while the pronouns which and how much are variable. Direct interrogative sentence example: Girl, what time is it?. In indirect interrogative sentences, for example: I would like to know who told Ana what time it was.
