nonrestrictive clause
lowformal, academic, technical
Definition
Meaning
A clause, usually a relative clause, that provides additional, non-essential information about a noun or noun phrase. It is set off by commas.
In grammar, a nonrestrictive clause adds descriptive detail, background, or commentary to the antecedent. Its removal does not alter the fundamental identification of the antecedent. In writing, it is often marked with commas (or parentheses or dashes).
Linguistics
Semantic Notes
The term is specific to grammatical analysis and language education. It contrasts directly with 'restrictive clause'. The 'non-' prefix indicates the clause's optional, descriptive nature.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or application. 'Non-restrictive clause' (with a hyphen) is more common in British style guides, while 'nonrestrictive clause' (without a hyphen) is standard in American grammar texts.
Connotations
None beyond its technical grammatical meaning.
Frequency
Equally common in grammatical discourse in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun phrase], + nonrestrictive clause + , + [verb phrase].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Extremely rare, except in formal business writing guides.
Academic
Common in linguistics, grammar, and English language textbooks and analysis.
Everyday
Almost never used in casual conversation.
Technical
Core term in grammar instruction and linguistic analysis.
Examples
By Part of Speech
adjective
British English
- The non-restrictive element was clearly marked.
American English
- A nonrestrictive modifier should be offset with commas.
Examples
By CEFR Level
- My brother, who lives in Canada, is visiting us.
- The conference, which was held in Vienna, attracted many experts.
- London Bridge, famously sold to an American, is a different structure from Tower Bridge.
- The final proposal, a document that had undergone numerous revisions, was approved unanimously.
- Her latest novel, which critics have hailed as a masterpiece, explores themes of memory and loss.
Learning
Memory Aids
Mnemonic
Think NONessential = NONrestrictive. If you can remove the clause without changing the main point, it's nonrestrictive.
Conceptual Metaphor
A COMMENTATOR (adds colour commentary) vs. a DEFINING FEATURE (essential for identification).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- No direct one-word equivalent. Requires understanding of the concept of defining vs. non-defining information. Beware of simply translating 'which' as 'который' without considering if commas are needed.
Common Mistakes
- Forgetting the commas that set it off.
- Using 'that' to introduce a nonrestrictive clause (correct: use 'which').
- Confusing it with a restrictive clause, leading to ambiguity.
Practice
Quiz
Which sentence contains a nonrestrictive clause?
FAQ
Frequently Asked Questions
No, standard English grammar requires 'which' (for things) or 'who/whom' (for people) to introduce a nonrestrictive clause. 'That' is used for restrictive clauses.
Parentheses ( ) or long dashes — — can also set off a nonrestrictive clause, often to create a more pronounced break or aside.
Yes, 'nonrestrictive clause' and 'non-defining relative clause' are fully synonymous terms.
The distinction changes the meaning of a sentence. For example, 'My sister who is a doctor' (restrictive) implies I have more than one sister. 'My sister, who is a doctor' (nonrestrictive) implies I have one sister, and she happens to be a doctor.