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Parentheses – Punctuation Rules & Examples

06.12.22 Punctuation Time to read: 3min

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Parantheses-Definition

Although we use parentheses (), also called parens, in our daily writing, most people still struggle to utilize them correctly.

This article will cover everything you need to know about parentheses, including when and how to apply them in a sentence.

If you’ve been grappling with any parentheses-related issues, this post is specifically for you.

Parentheses – In a Nutshell

  • Parentheses are curved punctuation marks that enclose extra information in writing
  • Parenthetical phrase – information within parentheses
  • It is grammatically incorrect to use a single parenthesis (singular form of parentheses)
  • You should use parentheses sparingly in your writing1

Parentheses: Placement of punctuation

Since we use parentheses in writing, learning how they correlate with other punctuation marks in a sentence is essential.

Punctuation Correlation
Periods (.) If the parenthetical phrase stands independently, the period is placed inside the closing parenthesis.

When the parenthetical phrase occurs at the end of a larger sentence, the period is placed outside the closing parenthesis.
Punctuation Correlation
Commas (,) If the parenthetical phrase occurs in the middle of a sentence, the punctuation mark should be placed outside the parentheses.
Punctuation Correlation
Question Marks (?) and Exclamation Points (!) When a parenthetical phrase is a full sentence occurring in the middle of a larger sentence, you should not capitalize nor end with a full stop – but you can use a question or exclamation mark.
  • The idea that you can leave school early without proper reason is absurd. (But don’t tell that to my 5-year-old son.)
  • My son joined Harrington Academy (the best school in town at the time).
  • We verified her accounting degree (Dublin, class of 1999), but his work experience remains questionable.
  • We verified his accounting degree (we didn’t think that would be an issue) but not his work experience (how could he lie to us!).3
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Side-by-side parentheses

Writers use side-by-side parentheses when they need to place two or more parenthetical elements in a single sentence.

The rules for using these punctuation marks vary from one academic style to the other.

APA Style
Use a single set of parentheses and separate parenthetical elements with a colon.
Chicago Style
You can use a single set of parentheses, but allows two sets of parens if the parenthetical phrase/elements are unrelated.

Example:

  • The school visited the Wild Place Project (WPP; Bristol, 2015).

Example:

  • The school visited the Wild Place Project (WPP), (Bristol 2015)

Nested parentheses

Writers use nested parentheses to enclose a set of parens inside another set.

For instance:

  • When inserting additional information about an in-text citation
  • When naming an organization in brackets followed by its abbreviations

It is good practice to use square brackets for the inner element.

Example:

  • Several tourist attraction sites (e.g., Wild Place Project [WPP]) supported the move.

It is advisable to avoid using nested parens whenever possible since it can lead to confusion about where the elements start and stop.

One of the best solutions is using square brackets for the inner element (as shown in the example above) to differentiate them from the original parens.

You can also rephrase the sentences to eliminate one of the parenthetical elements.

Example:

Several tourist attraction sites (e.g., Wild Place Project, WPP) supported the move.

FAQs

How do you use parens in a sentence?

You can use parens to enclose additional or supplemental information that clarifies a point in the sentence.

What is considered a parenthetical phrase?

Parenthetical phrases are comments or texts that are not essential to the rest of the sentence but can help clarify a point.

Can you end a sentence with parens?

Yes. Writers often use parens to cite information from external sources. So, they usually occur at the end of the sentence or right before a comma.

Sources

1 Gunner, Jennifer. “When & How To Use Parentheses Correctly (With Examples).” YourDictionary. Accessed November 21, 2022. https://grammar.yourdictionary.com/punctuation/when-how-use-parentheses-correctly-examples

2 CliffsNotes. “Uses of Parentheses.” Accessed November 21, 2022. https://apastyle.apa.org/style-grammar-guidelines/paper-format/page-header

3 Butte College. “The Comma.” Accessed November 21, 2022. http://www.butte.edu/departments/cas/tipsheets/punctuation/comma.html