Topic Explanation and Use
Core idea
Relative clauses help you join ideas smoothly without repeating the noun.
A relative clause adds information about a noun. It lets you connect two ideas without repeating the noun in a second full sentence.
Use relative clauses to describe or identify people, things, and places more efficiently. The key decision is whether the clause is essential or extra information.
At B1 level, build one correct base sentence first, then add detail without breaking grammar control.
Use it here
- Attach the clause directly to the noun it describes.
- Choose who, which, or that from the noun and the style you need.
- Do not repeat the subject inside the relative clause.
Watch it work
Remember this
- Choose the noun you want to describe before you add the clause.
- Use who for people, which for things, and that where natural.
- Do not repeat the subject inside the relative clause.
- Use commas only when the clause adds extra information rather than identifying the noun.
- Cut the clause if it does not help the reader understand the noun more clearly.
Real-World Examples with Non-defining relative clauses
Example 1
Too weakThe teacher gave feedback was very specific.
BetterThe teacher gave feedback that was very specific.
This correction matches the intended meaning and keeps Non-defining relative clauses natural.
Example 2
Too weakStudents who study consistently they usually improve faster.
BetterStudents who study consistently usually improve faster.
This version sounds more natural because Non-defining relative clauses fits the sentence clearly.
Common Errors with Non-defining relative clauses
Common problem 1
omitting or duplicating elements in relative clause structure
WeakThe teacher gave feedback was very specific.
StrongThe teacher gave feedback that was very specific.
Fix: attach the clause to the noun once and avoid repeating the subject
Common problem 2
repeating the subject inside the relative clause
WeakThe student who she won the prize thanked her teacher.
StrongThe student who won the prize thanked her teacher.
Fix: use the relative pronoun or the subject noun once, not twice
Common problem 3
using commas in a clause that identifies the noun
WeakStudents, who arrive early, usually get the front seats.
StrongStudents who arrive early usually get the front seats.
Fix: remove commas when the clause is necessary to identify the noun
Interactive Practice Lab
Practice
First notice the right form. Then build it yourself. Then fix it in a full sentence.
Score: 0/4
Read for meaning first. If the meaning changes, the grammar usually has to change too.
1. Quick pick
Choose the stronger sentence for Non-defining relative clauses.
2. Build it
Put this Non-defining relative clauses sentence in the correct order.
Tap a chunk to move it down. Tap it again to send it back.
3. Type the fix
Rewrite the sentence so Non-defining relative clauses is correct.
Fix this: The student who she won the prize thanked her teacher.
4. Final sort
Mark each sentence as correct or needing a fix.
The course provides materials that are easy to review at home.
The course provides materials are easy to review at home.
People who live near stations often use public transport more.
People which live near stations often use public transport more.
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