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Parentheses are generally not used in fiction writing. There is no comma before the opening parenthesis. If parentheses are located within a sentence, even if they enclose a complete sentence, do not capitalize the first enclosed word (unless it is a proper noun) or end it with a period inside the closing parenthesis.
1. Numbers or letters in a series (in running text)
Example: The answers are (1) dog, (2) cat, and (3) horse.
2. An aside, parenthetical element, or a digression
Example: She wasn’t ready for the test (neither was I), but a last-minute study session would help.
3. Explanatory information
Example: The cookies (the chocolate chip ones) are gone.
4. To indicate doubt. (?)
The name of the diner is Grumby’s (?), or maybe Grimby’s.
5. To indicate surprise. (!)
Mary had changed so much (!) that I almost didn’t recognize her.