🗺️ REDUCED RELATIVE CLAUSES GRAMMAR MAP

ACTIVE (-ING) & PASSIVE (-ED/V3) REDUCTION

Active Voice → V-ing | Passive Voice → Past Participle (V3).

(+) Positive man standing there (who is standing) • book published in 2020 (which was published)

(-) Negative omit relative pronoun + be verb

(?) Question Do you know the girl playing the piano?

TO-INFINITIVE REDUCTION (The first, The last, The only)

Used after ordinal numbers (the first, the second), superlatives (the best), or "the only".

(+) Positive the first man to step on the Moon • the only person to survive

(-) Negative not who stepped on

(?) Question Was Neil Armstrong the first man to walk on the Moon?

1. Form & Structure

Reduction Types & Formula Matrix

Active Reduction (V-ing): The man who is standing there → The man standing there is my uncle.
Passive Reduction (V3): The cars which were made in Japan → The cars made in Japan are durable.
To-Infinitive Reduction (To V1): He was the last student who entered the class → He was the last student to enter the class.
Noun Appositive Reduction: Barack Obama, who was the 44th US President → Barack Obama, the 44th US President, spoke today.

Example / Question	Positive / Short Answer	Negative / Short Answer
Active Voice → V-ing	The girl sitting next to me is friendly.	Replaces: who is sitting
Passive Voice → V3	The letter sent yesterday arrived.	Replaces: which was sent
Ordinal / Superlative → To V1	She was the first to arrive.	Replaces: who arrived

2. Key Rules & Formation

Rule	Base / Standard Form	Applied Form
Active Present Participle Rule	If the relative pronoun is the subject of an ACTIVE verb, drop the pronoun and change verb to V-ING.	who works → working
Passive Past Participle Rule	If the relative clause is PASSIVE, drop the pronoun and BE verb, keeping only the V3 (Past Participle).	which was built → built
Ordinal & Superlative To-Infinitive Rule	If the antecedent includes "the first, the last, the next, the only, or a superlative", reduce using TO-INFINITIVE.	the first to leave

3. Practical Usage & Examples

1. Writing concise academic essays and journalism

Eliminate wordiness in professional writing and publications.

The research conducted by Dr. Smith yielded groundbreaking results.

2. Describing subjects dynamically in literary prose

Flow seamlessly between subject descriptions and main predicate actions.

A lone gunman holding a rifle surrendered to the police.

3. Highlighting historical achievements and firsts

Emphasize historic milestones cleanly using to-infinitives.

Yuri Gagarin was the first human to travel into outer space.

4. Signal Words & Usage Context

V-ing reductionV3 reductionTo-V1 reductionthe first to V1the only person to V1

Reduction Checklist:

Active → V-ING
Passive → V3
First/Last/Only → TO V1

💡 Common Mistakes & Memory Tips

Mistake 1: Keeping both the relative pronoun and V-ing/V3
❌ Incorrect: The man who standing there is my uncle.
✓ Correct: The man standing there is my uncle. (or The man who is standing)
Note: Do not mix reduced form with relative pronoun.
Mistake 2: Using V-ing for passive relative clause reduction
❌ Incorrect: The house building fifty years ago is still strong.
✓ Correct: The house built fifty years ago is still strong.
Note: Passive clauses reduce to Past Participle (V3).
Mistake 3: Forgetting to use to-infinitive after "the only/the first"
❌ Incorrect: She was the first woman who winning the medal.
✓ Correct: She was the first woman to win the medal.
Note: Ordinal numbers and "the only" take to-infinitive.

❓ Frequently Asked Questions (FAQ)

Q1: Can non-defining relative clauses (with commas) be reduced?

Yes! E.g., "London, which is the capital of England, is huge" → "London, the capital of England, is huge" (Appositive noun phrase reduction).

Q2: Can relative clauses with stative verbs be reduced to V-ing?

Generally no. Sentences like "The girl who owns the dog" are rarely reduced to "The girl owning the dog". It sounds unnatural; keep the full clause.

Q3: How do we reduce a passive clause after "the first/the last"?

Use "to be + V3": "He was the first man TO BE LAUNCHED into space."

1. Form & Structure

Reduction Types & Formula Matrix

Active Reduction (V-ing): The man who is standing there → The man standing there is my uncle.

Passive Reduction (V3): The cars which were made in Japan → The cars made in Japan are durable.

To-Infinitive Reduction (To V1): He was the last student who entered the class → He was the last student to enter the class.

Noun Appositive Reduction: Barack Obama, who was the 44th US President → Barack Obama, the 44th US President, spoke today.

Example / Question	Positive / Short Answer	Negative / Short Answer
Active Voice → V-ing	The girl sitting next to me is friendly.	Replaces: who is sitting
Passive Voice → V3	The letter sent yesterday arrived.	Replaces: which was sent
Ordinal / Superlative → To V1	She was the first to arrive.	Replaces: who arrived

2. Key Rules & Formation

Rule	Base / Standard Form	Applied Form
Active Present Participle Rule	If the relative pronoun is the subject of an ACTIVE verb, drop the pronoun and change verb to V-ING.	who works → working
Passive Past Participle Rule	If the relative clause is PASSIVE, drop the pronoun and BE verb, keeping only the V3 (Past Participle).	which was built → built
Ordinal & Superlative To-Infinitive Rule	If the antecedent includes "the first, the last, the next, the only, or a superlative", reduce using TO-INFINITIVE.	the first to leave

3. Practical Usage & Examples

1. Writing concise academic essays and journalism

Eliminate wordiness in professional writing and publications.

The research conducted by Dr. Smith yielded groundbreaking results.

2. Describing subjects dynamically in literary prose

Flow seamlessly between subject descriptions and main predicate actions.

A lone gunman holding a rifle surrendered to the police.

3. Highlighting historical achievements and firsts

Emphasize historic milestones cleanly using to-infinitives.

Yuri Gagarin was the first human to travel into outer space.

💡 Common Mistakes & Memory Tips

Mistake 1: Keeping both the relative pronoun and V-ing/V3
❌ Incorrect: The man who standing there is my uncle.
✓ Correct: The man standing there is my uncle. (or The man who is standing)

Note: Do not mix reduced form with relative pronoun.

Mistake 2: Using V-ing for passive relative clause reduction
❌ Incorrect: The house building fifty years ago is still strong.
✓ Correct: The house built fifty years ago is still strong.

Note: Passive clauses reduce to Past Participle (V3).

Mistake 3: Forgetting to use to-infinitive after "the only/the first"
❌ Incorrect: She was the first woman who winning the medal.
✓ Correct: She was the first woman to win the medal.

Note: Ordinal numbers and "the only" take to-infinitive.

❓ Frequently Asked Questions (FAQ)

Q1: Can non-defining relative clauses (with commas) be reduced?

Yes! E.g., "London, which is the capital of England, is huge" → "London, the capital of England, is huge" (Appositive noun phrase reduction).

Q2: Can relative clauses with stative verbs be reduced to V-ing?

Generally no. Sentences like "The girl who owns the dog" are rarely reduced to "The girl owning the dog". It sounds unnatural; keep the full clause.

Q3: How do we reduce a passive clause after "the first/the last"?

Use "to be + V3": "He was the first man TO BE LAUNCHED into space."

Reduced Relative Clauses

1. Form & Structure

Reduction Types & Formula Matrix

2. Key Rules & Formation

3. Practical Usage & Examples

1. Writing concise academic essays and journalism

2. Describing subjects dynamically in literary prose

3. Highlighting historical achievements and firsts

4. Signal Words & Usage Context

💡 Common Mistakes & Memory Tips

❓ Frequently Asked Questions (FAQ)

Q1: Can non-defining relative clauses (with commas) be reduced?

Q2: Can relative clauses with stative verbs be reduced to V-ing?

Q3: How do we reduce a passive clause after "the first/the last"?

Reduced Relative Clauses

1. Form & Structure

Reduction Types & Formula Matrix

2. Key Rules & Formation

3. Practical Usage & Examples

1. Writing concise academic essays and journalism

2. Describing subjects dynamically in literary prose

3. Highlighting historical achievements and firsts

4. Signal Words & Usage Context

💡 Common Mistakes & Memory Tips

❓ Frequently Asked Questions (FAQ)

Q1: Can non-defining relative clauses (with commas) be reduced?

Q2: Can relative clauses with stative verbs be reduced to V-ing?

Q3: How do we reduce a passive clause after "the first/the last"?

Other Clauses lessons

Practice Exercises

Reduced Relative Clauses - Part 1

Reduced Relative Clauses - Part 2

Reduced Relative Clauses - Part 3

Reduced Relative Clauses - Part 4

Reduced Relative Clauses - Part 5