Grammar · Punctuation & Mechanics
Brackets & Parentheses
Slip extra information into a sentence without breaking it — round brackets, square brackets and where the full stop goes — with the film Stranger than Fiction.
Grammar › Punctuation & Mechanics › Brackets & Parentheses
The rule in one sentenceUse round brackets ( ) for extra information in your own sentences, and square brackets [ ] only for words you add or change inside somebody else’s quotation.
About the film
Stranger than Fiction (2006) is a comedy about Harold Crick (a tax inspector with an extremely tidy routine). He counts his steps, times his coffee break to the minute and lives almost entirely by his wristwatch. One morning, he suddenly hears a woman’s voice describing everything he does, like the narrator of a novel (and nobody else can hear it). The voice belongs to Karen Eiffel, a writer who is struggling to finish her latest book.
What does it do?
Brackets let you open a small side door in a sentence, add something extra and then close it again. The narrator in this film does something similar: she interrupts Harold’s ordinary day to add comments that he never asked for. The simple test is this: if you delete everything inside the brackets, the main sentence should still be complete and correct.
British and American English name the marks differently. In Britain, ( ) are simply called brackets, and [ ] are square brackets; in the United States, ( ) are parentheses. Whatever you call them, round brackets are for your own sentences, while square brackets appear inside a quotation to show that you, not the original speaker, have changed something.
In the first three tiles, try removing the part in round brackets. Each sentence still works perfectly. In the last tile, the critic originally wrote only “He”, so the name in square brackets is your own addition, clearly marked as not belonging to the quotation.
Now the most common question: where does the full stop go? If the brackets hold only part of a sentence, the full stop belongs to the whole sentence, so it goes outside the closing bracket. Only when a complete, separate sentence sits inside the brackets does the full stop go inside.
Harold eats lunch at exactly the same time every day (which is unusual). Harold eats lunch at exactly the same time every day. (This is very unusual.)
In the first sentence, the brackets are part of a bigger sentence, so the full stop comes after the bracket. In the second, the bracketed words form a complete sentence of their own, so they keep their full stop inside.
Visual guide
Teacher Teddy’s illustrated guide to this rule is being drawn — the full swipe-through infographic will appear here soon.
How to make it
round brackets — in your own sentence
Harold works for the tax office (and has done for years).
Harold doesn’t enjoy surprises (of any kind).
Never put a comma directly before an opening bracket.Can Harold (or anyone else) explain the voice?
The question mark belongs to the whole sentence, so it goes after the bracket.square brackets — inside a quotation
The review said: “It [the film] is gentle and clever.”
The review said: “It [the story] isn’t a typical comedy.”
Round brackets here would look like the reviewer’s own words.Did the critic really write “[Harold] never smiles”?
The square brackets show that the name was added later.When to use each one
Use round brackets for…
Use square brackets for…
Words that help: which brackets?
Ask yourself whose words you are writing. That single question usually decides which brackets the sentence needs.
round brackets often hold…
square brackets often hold…
Common mistakes
❌ Harold Crick, (a tax inspector) hears a voice.
✅ Harold Crick (a tax inspector) hears a voice.
A comma never comes directly before an opening bracket; the brackets already separate the extra information.
❌ Harold lives alone (in a very quiet flat.)
✅ Harold lives alone (in a very quiet flat).
The brackets hold only part of the sentence, so the full stop belongs outside the closing bracket.
❌ Harold hears a voice. (Nobody else can hear it).
✅ Harold hears a voice. (Nobody else can hear it.)
When the brackets contain a complete sentence of their own, the full stop stays inside with it.
❌ My friend wrote: “He (Harold) is so funny.”
✅ My friend wrote: “He [Harold] is so funny.”
Inside a quotation, your own additions go in square brackets so readers know the words are not your friend’s.
One more thing
This part stretches to the top of the level. You can come back to it later.
Brackets, commas or dashes? All three can hold extra information, but they change the volume of your sentence. Commas are neutral, round brackets make the extra words quieter, almost like a whisper, and dashes make them louder and more dramatic. Choose the one that matches how important the extra information really is, and try not to use more than one pair of brackets in a single sentence.
✅ Harold, a careful man, checks his watch. (neutral)
✅ Harold (a careful man) checks his watch. (quieter)
✅ Harold — a very careful man — checks his watch. (louder)
Practice: choose the right version
Eight questions about brackets, all set in the world of the film. Choose the correctly punctuated version, and read the explanation that follows.
1. Which sentence is correct?
There is never a comma directly before an opening bracket.
2. Which sentence is correct?
The brackets hold only part of the sentence, so the full stop goes outside.
3. Which is correct after “Harold hears a voice.”?
A complete separate sentence in brackets keeps its full stop inside.
4. A critic wrote “He never smiles.” You add the name. Which is correct?
Square brackets show that you added the name to someone else’s words.
5. A quote spells the name “Crik”. How do you show the mistake is not yours?
[sic] in square brackets means the mistake was in the original.
6. Which sentence uses round brackets correctly?
A year added to your own sentence goes in round brackets.
7. Which question is punctuated correctly?
The question belongs to the whole sentence, so the question mark goes at the end, after the bracket.
8. You want the extra detail to sound quiet and unimportant. Which do you choose?
Brackets turn the volume down; dashes turn it up.
Your turn
Choose one ending. Then listen to your sentence.
Every ending here makes a correct sentence. Notice that the full stop comes after the closing bracket, because the brackets hold only part of the sentence. Choose the ones that are true for you, and say them out loud.
Keep going
More lessons
Practise listening at your level
Hear this grammar used for real — Advanced English listening practice. Full movie reviews in slow, clear English, levelled for Advanced learners. One new episode every week, free, with a transcript. AdvancedFree playlistWatch on YouTube