Yishun Secondary 3 English tuition should help students see how a relative clause can either identify which person/thing is meant or simply add extra information about an already identifiable referent. The comma changes meaning because it changes the clause’s job.
This rebuilt legacy URL now owns one distinct Sec 3 English job: head noun → identifying need → restrictive/non-restrictive clause → punctuation → meaning check. Old generic promotional copy and stale Yishun-centre wording have been removed.
eduKateSG does not claim a current Yishun branch. Current centres are at 83 Punggol Central, Singapore 828761 and 8 Fourth Avenue, Singapore 268674. Selected Secondary English classes run in focused 3-pax small groups, typically 1.5 hours.
The Direct Answer
A restrictive relative clause identifies or limits which noun is meant:
“The students who submitted early received feedback first.”
Only the students who submitted early are being referred to.
A non-restrictive relative clause adds extra information about a noun already identifiable:
“Mira, who submitted early, received feedback first.”
Mira is already identified; the clause adds a comment about her.
Commas do not merely create pauses here; they mark whether the relative clause is essential to identifying the noun.
Restrictive: Which One?
“The book that has the red cover is mine.”
The clause tells the listener which book among several.
Remove the clause and “The book is mine” may no longer identify the intended book.
Non-Restrictive: Extra Information
“My English textbook, which has a red cover, is on the desk.”
The noun phrase my English textbook may already be uniquely identifiable in context. The clause adds an extra fact.
The Identification Test
Ask:
Does the reader need this clause to know which noun I mean?
Yes → restrictive is likely.
No, the noun is already identifiable → non-restrictive may be appropriate.
The Deletion Test
Delete the relative clause.
Restrictive:
“The students who revised the draft improved.”
Delete: “The students improved.”
Meaning broadens to all students.
Non-restrictive:
“The principal, who had read the report, approved it.”
Delete: “The principal approved it.”
The same principal remains identified; only extra information disappears.
Worked Example: Commas Change Scope
“My brothers who live overseas are visiting.”
Possible meaning: I have several brothers; only those living overseas are visiting.
“My brothers, who live overseas, are visiting.”
Possible meaning: all my brothers live overseas, and all are visiting.
The comma creates a real difference in reference.
That vs Which
In careful formal usage, that is commonly used for restrictive clauses and is generally not used in non-restrictive clauses:
Restrictive: “The report that contains the new data is missing.”
Non-restrictive: “The report, which contains the new data, is missing.”
Students should follow school-taught conventions and keep punctuation/meaning aligned.
Who
Who can appear in either type:
Restrictive: “Students who need help may stay behind.”
Non-restrictive: “Amir, who needs help, will stay behind.”
Where and When
Relative adverbs can also appear in identifying or extra-information clauses:
“The day when the system failed was chaotic.”
“Monday, when the system failed, was chaotic.”
Context determines whether identification is needed.
Worked Example: School Rules
“Students who arrive late must report to the office.”
This does not mean all students arrive late. The clause identifies the subset.
Writing commas around the clause would suggest all students arrive late, which changes the proposition.
Worked Example: Generalisation Error
“Electric cars that have large batteries can travel farther.”
The clause identifies a subset.
“Electric cars, which have large batteries, can travel farther.”
This can sound like all electric cars have large batteries. Punctuation therefore affects factual scope.
The Scope Test
Rewrite the noun phrase as:
all X or only the X that…
If the clause selects a subset, restrictive meaning is likely.
The Already-Known Test
Proper names often support non-restrictive clauses because the referent is already identified:
“Singapore, which is an island city-state,…”
But a proper name can still be followed by identifying material in unusual contexts where multiple referents share the name. Grammar follows meaning, not a simplistic “name = commas” rule.
Restrictive Clauses Without Commas
Do not insert commas simply because the relative clause is long.
If the clause is essential to identifying the noun, it remains restrictive even when lengthy.
Non-Restrictive Clauses With Commas
Use commas to separate extra information:
“The new library, which opened last month, has longer hours.”
The sentence identifies the new library before the clause.
Spoken Pauses Are Not Enough
Writers sometimes hear a pause and add commas. The stronger method is semantic:
Is the clause identifying the noun, or merely commenting on it?
Worked Example: Editing
Draft:
“The students, who completed the optional task, received certificates.”
If only some students completed it, the commas are wrong.
Repair:
“The students who completed the optional task received certificates.”
Worked Example: Ambiguous Reference
“My sister who lives in London called.”
This can imply I have more than one sister.
If I have one sister and merely want to add where she lives:
“My sister, who lives in London, called.”
Relative Clause vs Apposition
“Mira, the class captain, spoke first.”
This is apposition, not a relative clause, but it performs a similar extra-information job. Students should distinguish grammatical form while noticing the shared information structure.
Relative Clauses in Comprehension
Restrictive clauses help identify subsets. This matters in inference:
“People who registered online received a code.”
We cannot conclude that every person received a code.
Relative Clauses in Argument
Scope precision matters:
“Policies that reduce unnecessary barriers can improve access.”
This is narrower than:
“Policies, which reduce unnecessary barriers, can improve access.”
The second punctuation can accidentally generalise the property to all policies.
Sec 3 Progression
Secondary 3 students are ready to connect relative-clause grammar with reference, scope and factual precision. MOE’s Secondary English Language Syllabus 2020 emphasises effective control of grammar and cohesion across increasingly complex texts. Official reference: MOE Secondary English Language Syllabus 2020.
Common Restrictive/Non-Restrictive Failure Modes
| Symptom | Issue | Repair |
|---|---|---|
| Commas added by pause only | Meaning not checked | Use identification test |
| Restrictive clause set off by commas | Subset becomes generalised | Remove commas |
| Non-restrictive clause unpunctuated | Extra info looks identifying | Add commas |
| that used in non-restrictive clause | Formal convention broken | Use which/who as appropriate |
| Deletion changes noun scope unnoticed | Reference control weak | Run deletion test |
Why Three Students Helps
One student identifies the head noun, one decides whether the clause selects a subset, and the third removes/adds commas and explains how the meaning changes.
When Yishun Secondary 3 Families May Consider This Support
- Relative-clause commas are guessed by sound.
- That/which choices feel arbitrary.
- Writing accidentally generalises from a subset.
- Comprehension misses the difference between all members and only those identified by the clause.
What Progress Should Look Like
A stronger Sec 3 learner can decide whether a relative clause is necessary for identification, punctuate it accordingly and explain how the clause changes the scope of the noun phrase.
Independent location notice: eduKateSG does not claim a current Yishun branch. Current centres: 83 Punggol Central, Singapore 828761 and 8 Fourth Avenue, Singapore 268674. Contact +65 8823 1234.