Both speakers and writers often use question mark punctuation incorrectly.
For example, unless the speaker/writer of the sentence below wants to broadcast her own insecurity and is looking for approval, the question mark doesn’t belong there:
“Then I asked her if she owns her home?”
The next example is a direct question. In this case, the question mark is correct:
“Do you own your home?”
You can also use a question mark to express surprise or confusion:
“You went to Iceland last weekend?”
For more information about question mark punctuation, see The Chicago Manual of Style.
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