THE QUESTION MARK
A question mark is used at the end of a direct question. It may also be used to indicate uncertainty either within or at the end of a statement.
1. Use a question mark at the end of a direct question.
What time is it?
Are you dressed for the wedding?
Could you please turn up the heat?
2. Use a question mark to indicate uncertainty within or at the end of a statement.
They spent a lot (too much?) on that purebred dog.
You're dressed for the wedding?
3. Note some points regarding use of the question mark.
He asked her if she was dressed for the wedding.
Did Juanita hide the candy in the cupboard? In the hall closet? Under the bed?