1. Lesson Overview
In this lesson, you will learn how relative clauses modify nouns and provide additional information within sentences.
A relative clause is a type of dependent clause that describes or identifies a noun. These clauses usually begin with relative pronouns such as:
-
who
-
whom
-
whose
-
which
-
that
Example:
The scientist who conducted the experiment published the results.
| Noun | Relative Clause |
|---|---|
| scientist | who conducted the experiment |
Relative clauses allow writers to combine ideas and avoid repetition, making sentences more concise and precise.
By the end of this lesson, you will be able to:
-
recognise how relative clauses modify nouns
-
use relative pronouns correctly
-
distinguish between defining and non-defining relative clauses
-
avoid common errors involving relative clause structure
2. Concept Introduction
Consider these sentences:
The scientist conducted the experiment. The scientist published the results.
These sentences can be combined using a relative clause:
The scientist who conducted the experiment published the results.
| Clause | Function |
|---|---|
| who conducted the experiment | relative clause modifying “scientist” |
The relative clause provides additional information about the noun.
3. Core Explanation
A relative clause is introduced by a relative pronoun and modifies a noun that appears earlier in the sentence.
Basic structure:
Noun + Relative Pronoun + Clause
Example:
The report that the researcher prepared was published.
Here the relative clause that the researcher prepared modifies the noun report.
Relative clauses help combine information efficiently.
Example:
Separate sentences:
The device was tested yesterday. The device produced accurate results.
Combined sentence:
The device that was tested yesterday produced accurate results.
4. Rule Table
Relative Pronouns and Their Functions
| Relative Pronoun | Used For | Example |
|---|---|---|
| who | people (subject) | The researcher who analysed the data published the results. |
| whom | people (object) | The scientist whom the committee invited delivered a lecture. |
| whose | possession | The researcher whose theory was confirmed received recognition. |
| which | things / animals | The equipment which failed was replaced. |
| that | people or things | The experiment that succeeded was repeated. |
Structure of Relative Clauses
| Structure | Example |
|---|---|
| Noun + who + clause | The scientist who discovered the method published the findings. |
| Noun + which + clause | The experiment which produced the results was repeated. |
| Noun + that + clause | The device that failed was repaired. |
5. Usage
1. Identifying people
Example:
The researcher who analysed the samples wrote the report.
2. Describing objects or things
Example:
The equipment that malfunctioned was replaced.
3. Showing possession
Example:
The scientist whose theory was confirmed received recognition.
4. Providing additional information
Example:
The report which was published yesterday received widespread attention.
5. Combining sentences
Example:
Separate sentences:
The experiment produced important results. The experiment was conducted last year.
Combined sentence:
The experiment that was conducted last year produced important results.
6. Signal Words
Relative clauses are introduced by relative pronouns.
| Relative Pronoun | Example |
|---|---|
| who | the scientist who analysed the samples |
| whom | the researcher whom the committee invited |
| whose | the scientist whose work changed the theory |
| which | the equipment which malfunctioned |
| that | the experiment that succeeded |
These pronouns connect the noun and the relative clause.
7. Special Cases
Defining Relative Clauses
A defining relative clause identifies which person or thing is being discussed.
Example:
The experiment that failed was repeated.
Without the clause, the meaning becomes unclear.
Non-defining Relative Clauses
A non-defining relative clause provides additional information and is separated by commas.
Example:
The experiment, which was conducted last year, produced important results.
The clause provides extra information but is not essential.
8. Additional Notes
Relative clauses help writers avoid repetition and produce more sophisticated sentence structures.
Example:
Repetitive version:
The researcher analysed the samples. The researcher wrote the report.
Improved version:
The researcher who analysed the samples wrote the report.
This structure improves clarity and efficiency in writing.
9. Common Errors
⚠ Missing relative pronoun
Incorrect:
The scientist conducted the experiment published the results.
Correct:
The scientist who conducted the experiment published the results.
Explanation:
Relative clauses require relative pronouns.
⚠ Incorrect relative pronoun
Incorrect:
The scientist which analysed the samples published the report.
Correct:
The scientist who analysed the samples published the report.
Explanation:
Who is used for people.
⚠ Missing commas in non-defining clause
Incorrect:
The experiment which was conducted last year produced important results.
Correct:
The experiment, which was conducted last year, produced important results.
Explanation:
Non-defining clauses are separated by commas.
⚠ Confusing whose and who
Incorrect:
The researcher who theory was confirmed received recognition.
Correct:
The researcher whose theory was confirmed received recognition.
Explanation:
Whose shows possession.
⚠ Repeating the noun
Incorrect:
The scientist who he discovered the method received recognition.
Correct:
The scientist who discovered the method received recognition.
Explanation:
Do not repeat the subject inside the relative clause.
10. Lesson Mastery
After completing this lesson, you should now be able to:
✅ recognise how relative clauses modify nouns
✅ use relative pronouns correctly
✅ distinguish between defining and non-defining relative clauses
✅ avoid common errors involving relative clause structure