When should I use commas with relative clauses? My sentences always seem wrong
I'm trying to improve my English writing, but I'm confused about when I should use commas with relative clauses. For example, is it correct to write: 'My brother who lives in Canada is visiting next week' or should it be 'My brother, who lives in Canada, is visiting next week'? I see both versions in different places.
Also, does the meaning change depending on the commas? I want to make sure my sentences are clear, but I'm struggling to understand the difference. Any advice or examples would be really helpful!
Context:
Audience: intermediate adult ESL learners; Style: formal writing and emails
What to Know
| Question You Likely Still Have | Direct Answer | How To Apply It |
|---|---|---|
| What is the core rule for commas with relative clauses? | Understanding Commas with Relative Clauses: The Pattern Approach When deciding whether to use commas with relative clauses (like 'who', 'that', or 'which'), follow this pattern: U… | (Commas: All the students passed, and by the way, they studied hard too.) Practice: Try writing two sentences about a colleague: One with essential information (no commas) One wit… |
| How do I apply commas with relative clauses in a sentence like mine? | (Commas: All the students passed, and by the way, they studied hard too.) Practice: Try writing two sentences about a colleague: One with essential information (no commas) One wit… | If you can remove the clause and the meaning remains clear, it needs commas. |
| What mistakes should I avoid with commas with relative clauses? | If the clause is needed to know who you’re talking about, do not use commas. | Don’t use commas for essential (defining) information. |
3 Answers
Understanding Commas with Relative Clauses: The Pattern Approach
When deciding whether to use commas with relative clauses (like 'who', 'that', or 'which'), follow this pattern:
- Use commas for non-essential (non-defining) information. This extra detail could be removed without changing the basic meaning of the sentence.
- Don’t use commas for essential (defining) information. This information is necessary to understand exactly who or what you mean.
Comparison Examples:
- The students who studied hard passed the test. (No commas: Only those particular students passed.)
- The students, who studied hard, passed the test. (Commas: All the students passed, and by the way, they studied hard too.)
Practice:
Try writing two sentences about a colleague:
- One with essential information (no commas)
- One with extra, non-essential information (with commas)
Self-Check:
Read your sentences aloud. If you can remove the clause and the meaning remains clear, it needs commas. If the clause is needed to know who you’re talking about, do not use commas.
Contrastive Pair Method: Spotting the Difference
The presence or absence of commas with relative clauses depends on whether the clause is essential to the meaning of the sentence.
Example 1:
- Workers who arrive late must sign a register. (No commas: Only the late workers must sign.)
- Workers, who arrive late, must sign a register. (With commas: All workers must sign because, by the way, they all arrive late.)
Example 2:
- The book that you lent me was fascinating. (No commas: I’m talking about a specific book—the one you lent me.)
- The book, which you lent me, was fascinating. (With commas: The fact you lent it is extra info; you already know which book.)
Practice Step:
Rewrite this sentence twice, with and without commas: The teacher who speaks French is new. How does the meaning change?
Correction Tip:
When editing, ask yourself: “Does everyone know who/what I mean without this clause?” If yes, use commas. If no, leave them out.
Guided Improvement: Editing for Clarity with Relative Clauses
Let’s clarify how commas change sentence meaning with relative clauses:
- No comma: The information is needed to say exactly who/what you mean (restrictive/defining clause).
- Comma: The information is extra, like an aside (non-restrictive/non-defining clause).
Consider these:
- Our manager who joined last year is organizing the event. (No comma: We have more than one manager. Only the one who joined last year is organizing.)
- Our manager, who joined last year, is organizing the event. (Comma: We have only one manager; the fact she joined last year is extra info.)
Practice Suggestion:
Review your recent emails. Find where you used 'who' or 'which' and check: Can readers understand who/what you mean without the clause? If yes, add commas. If not, remove commas.
Self-editing Feedback:
If your sentence could refer to more than one possible person/thing, do NOT use commas. If it’s only one and you’re adding detail, DO use commas.
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