Brackets and dashes for parenthesis
Use round brackets, dashes and commas to mark extra information in a sentence. Check that removing the information leaves the main message clear.
What a learner can do afterwards
- Enclose a mid-sentence aside in paired round brackets, and check that removing it leaves the main message clear.
- Use paired long dashes around a mid-sentence aside, rather than hyphens.
- Choose punctuation for the intended effect: brackets usually suggest background information, commas keep a detail closely connected, and dashes can add emphasis.
1 · Read
A parenthesis is extra information added to a sentence. In the middle of a sentence, mark its beginning and end with round brackets, dashes or commas. Remove the aside to check the sentence. The remaining words must form a complete sentence and keep the main message clear. Round brackets always need an opening ( and a closing ).
Our boat (painted blue) crossed the lake. Remove 'painted blue': Our boat crossed the lake. The main message stays clear. But in 'Choose the boat with the red flag', the flag tells us which boat to choose. Removing those words can change the message even though the sentence still sounds complete.
Dashes can give an aside extra emphasis: Our boat – painted blue – crossed the lake. These spaced long dashes are punctuation marks. A short hyphen, as in blue-green, joins word parts and is not a substitute. If an aside contains a list with commas, brackets or dashes can make its boundaries clearer.
Commas usually keep an aside closely connected to the sentence: Our boat, painted blue, crossed the lake. Brackets usually make it feel like background information. Dashes can draw more attention to it. These are writing effects, not measured volumes or rules about speaking loudly. A detail in brackets can still be useful or interesting.
At the end of a sentence, brackets still come in a pair: We reached the shore (before lunch). The full stop goes after the closing bracket. A comma or dash aside at the end does not need a second comma or dash before the full stop: We reached the shore – just in time.
Find the main message first. Then check the aside's boundaries. For a middle aside, the opening and closing marks must be the same kind.
Keep the main message clear. Use matching marks around a middle aside. Brackets suggest background detail; dashes can add emphasis; commas keep the detail closely connected.
Original lesson, practice and learning-card text written for this dataset. Khan Academy punctuation records informed factual checks and question design.
Five independently written readings prepared for this dataset, with learning cards about parenthetical punctuation. Khan Academy records informed factual checks.
More to read
Find the extra detail
Read this sentence: The kite (made from red paper) caught the wind.
The main event is the kite catching the wind. The words 'made from red paper' describe the kite. The round brackets mark that detail's beginning and end.
Without the bracketed words, we have: The kite caught the wind. The main event stays clear.
Now check this version: The (kite made from red paper) caught the wind. Removing the bracketed words leaves 'The caught the wind'. That is incomplete. The brackets enclose words the main sentence needs.
Choose an effect
Compare three ways to present a detail.
The kite, made from red paper, caught the wind.
The commas keep the detail closely connected to the sentence.
The kite (made from red paper) caught the wind.
The brackets make the detail feel like background information.
For a dash version, replace the two commas in the first example with long dashes. Put one after 'kite' and one after 'paper'.
The long dashes can draw more attention to the detail. They differ from the short hyphen in red-and-white.
These choices do not assign a speaking volume. You can read all three versions without whispering or shouting.
Close the brackets
Asha writes: Our tent (beside the river stayed dry.
Find the main message: Our tent stayed dry. The location 'beside the river' is extra information. Put the closing bracket after 'river': Our tent (beside the river) stayed dry.
Both round brackets are needed even when the aside comes last: Our tent stayed dry (beside the river).
Here the full stop ends the whole sentence. It goes after the closing bracket. The detail in brackets belongs to that sentence.
When the aside comes last
Start with 'Our tent beside the river stayed dry.' To mark 'beside the river' as an aside, put a long dash before 'beside' and another after 'river'.
The aside interrupts the main sentence. The second dash closes it before the main sentence continues with 'stayed dry'.
Now start with 'Our tent stayed dry even during the storm.' Put a long dash before 'even'. This aside comes last. The full stop ends the sentence, so there is no second dash.
A comma aside can also come last: We borrowed a tent, a large green one.
Round brackets still need both marks at the end: We borrowed a tent (a large green one).
Does the detail identify something?
There are three tents. Asha says, 'Use the tent with the yellow door.' The words 'with the yellow door' tell us which tent she means. Leave those words in the main sentence.
Asha has only one tent of her own. She writes, 'My tent (with its yellow door) is easy to spot.' The tent is already identified as hers. The bracketed words add a detail.
Removing words is only part of the check. Ask whether the remaining sentence is complete and whether it still tells the reader who or what you mean.
2 · Watch
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