brackets – Punctuation Rules & Examples

06.12.22 Punctuation Time to read: 3min

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Parantheses-Definition

Although we use brackets (), also called parens or round brackets, in our daily writing and academic writing, most people still struggle to utilize them correctly. They help provide additional, often nonessential, information to a sentence without disrupting the main idea. This article will cover everything you need to know about brackets, including when and how to apply them in a sentence. If you’ve been grappling with any brackets-related issues, this post is specifically for you.

brackets – In a Nutshell

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

Definition: brackets

brackets are curved punctuation marks used to enclose additional information in writing. The language rules of using brackets are very specific and many do not know how to use them correctly. Their primary purpose is to allow the writer an opportunity to add text or comments that may serve to clarify or illustrate what they’ve written. These punctuation marks also create room for digressions or afterthoughts in writing.

brackets: Placement of punctuation

Since we use brackets in writing, learning how they correlate with other punctuation 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.

Example

  • 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).
Punctuation Correlation
Commas (,) If the parenthetical phrase occurs in the middle of a sentence, the punctuation mark should be placed outside the parentheses.

Example

  • We verified her accounting degree (Dublin, class of 1999), but his work experience remains questionable.
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.

Example

  • 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!).
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Side-by-side brackets

Writers use side-by-side brackets 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 Example
Use a single set of parentheses and separate parenthetical elements with a colon. The school visited the Wild Place Project (WPP; Bristol, 2015).
Chicago Style Example
You can use a single set of parentheses, but allows two sets of parens if the parenthetical phrase/elements are unrelated. The school visited the Wild Place Project (WPP), (Bristol 2015)

Nested brackets

Writers use nested brackets to enclose a set of parens inside another set. This can happen:

  • When inserting additional information about an in-text citation
  • When naming an organisation 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

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

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

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.

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