Question mark (?)
A question mark is used to indicate the end of a question:
Have you seen the movie yet?
Note that you don’t use a question mark at the end of a question in reported speech:
He asked if I had seen the movie yet.
A question mark can also be used in parentheses to show that the writer is unconvinced by or unclear about a statement:
I’m about to get started on the new project, which is apparently quite straightforward (?).
Back to Punctuation.
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