English Language Arts · 9th Grade · Grammar, Style, and the Power of Language · Weeks 28-36

Dashes and Parentheses for Emphasis

Using dashes and parentheses effectively to add emphasis, explanation, or an aside in writing.

• Common Core State Standards
• CCSS.ELA-LITERACY.L.9-10.2.A
• CCSS.ELA-LITERACY.L.9-10.2.B

About This Topic

Dashes and parentheses both allow writers to insert additional information into a sentence, but they signal very different relationships to the reader. A dash creates a strong pause and draws attention to what follows, it says 'notice this.' Parentheses lower the stakes of the inserted material, suggesting it is supplementary rather than central. Colons and commas occupy positions on this spectrum too, and students who understand the full range can match punctuation to intention rather than relying on one mark for every situation.

In US 9th grade ELA, teaching dashes and parentheses as style tools, not just correctness rules, connects grammar instruction to the larger project of developing a writer's voice. CCSS L.9-10.2 asks students to use punctuation for effect, which requires understanding punctuation as a rhetorical choice, not just a mechanical one.

Active learning formats work well here because the effects of different punctuation choices are easiest to perceive when students encounter multiple versions of the same sentence side by side. Comparison tasks and revision workshops that foreground the reader's experience turn a potentially dry mechanics lesson into genuine craft instruction.

Key Questions

1. When is a dash more appropriate than a set of parentheses for adding information?
2. How can punctuation be used to create a specific 'voice' or tone in a text?
3. Compare the impact of using dashes versus commas to set off an appositive phrase.

Learning Objectives

• Compare the stylistic impact of dashes versus parentheses when inserting explanatory or supplementary information into sentences.
• Analyze how the choice between dashes, parentheses, and commas affects the perceived voice and tone of a written passage.
• Revise sentences to effectively employ dashes and parentheses for emphasis, clarification, or to create a specific authorial voice.
• Evaluate the rhetorical effectiveness of different punctuation choices in published texts.

Before You Start

Commas for Clauses and Phrases

Why: Students need a solid understanding of how commas function to set off nonessential clauses and phrases before they can effectively compare them to dashes and parentheses.

Sentence Structure: Independent and Dependent Clauses

Why: Understanding how clauses combine to form sentences is fundamental to grasping how dashes and parentheses insert or connect additional information.

Key Vocabulary

em dash	A punctuation mark used to indicate a sudden break in thought, an interruption, or to set off a strong parenthetical statement. It signals a more emphatic interruption than parentheses.
parentheses	Punctuation marks used to enclose supplementary information, explanations, or asides that are considered less essential to the main sentence structure. They signal a softer, more detached insertion.
aside	A remark or passage in a book, play, or other work that is intended to be heard by the reader or audience but not by other characters in the work. In writing, this often uses parentheses or dashes.
appositive phrase	A noun or noun phrase that renames another noun right beside it. It can be essential or nonessential, affecting punctuation choices like commas, dashes, or parentheses.

Watch Out for These Misconceptions

Common Misconception

Dashes and parentheses are interchangeable, both just add extra information.

What to Teach Instead

These marks signal different levels of importance and create different reading experiences. A dash amplifies; parentheses minimize. When students place the same inserted phrase in the same sentence using each mark in turn and describe the effect aloud, they reliably notice the difference within the first few tries.

Common Misconception

Using dashes frequently is a sign of strong, emphatic writing.

What to Teach Instead

Overuse of dashes flattens their effect and can make writing feel fragmented or breathless. One well-placed dash per paragraph is often more powerful than five. Students who read published writers closely notice this restraint and start applying it to their own work.

Active Learning Ideas

Think-Pair-Share: Same Words, Different Marks

Give students three versions of the same sentence, one using a dash, one using parentheses, and one using a pair of commas, to set off the same phrase. Students individually write one sentence describing how each version feels different to read, then compare with a partner before the class builds a shared description of each mark's effect.

20 min·Pairs

Writing Workshop: Voice Through Punctuation

Students write a short paragraph (8-10 sentences) on any topic they know well, intentionally including one dash and one set of parentheses. They then annotate why they chose each mark in that location. Partners read each other's paragraphs and identify whether the punctuation choice matches the writer's stated intention.

30 min·Pairs

Gallery Walk: Punctuation in Published Prose

Post 8 excerpts from published essays, journalism, and literary nonfiction around the room, each featuring a distinctive use of dash or parentheses. Groups annotate the effect and purpose of each mark, then the class debriefs by categorizing uses: emphasis, aside, definition, appositive, tone shift.

35 min·Small Groups

Real-World Connections

• Journalists use dashes to insert quick factual clarifications or brief authorial commentary into breaking news articles, ensuring readers get essential context without losing the main narrative flow.
• Authors of young adult fiction often employ dashes to mimic the rapid thought processes or conversational tone of their teenage characters, creating a more immediate and relatable voice for the reader.
• Technical writers might use parentheses to provide definitions or supplementary instructions for complex procedures, ensuring clarity and precision in user manuals or software documentation.

Assessment Ideas

Quick Check

Provide students with three sentences, each containing the same piece of information inserted using commas, dashes, and parentheses. Ask students to write one sentence explaining which punctuation mark creates the strongest emphasis and why.

Exit Ticket

Present students with a short paragraph containing an opportunity for an aside. Ask them to rewrite the paragraph twice: once using dashes for the aside and once using parentheses, then briefly explain the difference in tone each version creates.

Peer Assessment

Students exchange sentences they have revised to include an appositive phrase using either dashes or commas. Partners identify the punctuation used and write one sentence evaluating whether the chosen punctuation effectively highlights or downplays the appositive information.

Frequently Asked Questions

When should I use a dash instead of parentheses in writing?

Use a dash when you want the inserted material to stand out and receive emphasis, it tells the reader to pay attention. Use parentheses when the material is genuinely supplementary and you want the reader to treat it as an aside. The test is simple: if removing the insertion would significantly change the sentence's impact, a dash is usually the right choice.

How do dashes create voice and tone in writing?

Dashes create a controlled pause that mimics the rhythm of spoken thought, giving writing a more immediate, sometimes more urgent quality. Writers like Joan Didion and David Foster Wallace use them to create a sense of accelerating or qualifying thought. Students can study these effects by reading passages aloud and noticing where the pause lands.

How can active learning help students learn to use dashes and parentheses effectively?

The distinction between these marks is primarily about reader experience, which students understand best through comparison and experimentation rather than rules. Revision workshops that ask students to swap dashes for parentheses in their own writing and then describe what changes create authentic engagement with the choice that grammar drills cannot replicate.

What is the difference between a dash and a comma for setting off an appositive?

A comma sets off an appositive neutrally, treating it as expected information. A dash signals that the appositive is particularly important or surprising, it adds drama. A parenthetical sets off the same material as bonus information the reader might skip. Students can test this by substituting each mark in the same sentence and reading each version aloud to hear the difference.