Rules
Comprehensive notes, formulas, and practice questions for Rules.
Rules
Active and Passive Voice — Rules
What is Voice?
Voice tells us the relationship between the subject of a sentence and the action of the verb.
- Active Voice: The subject performs the action. (Subject → Action → Object)
- Passive Voice: The subject receives the action. (Object becomes subject)
| Voice | Example |
|---|---|
| Active | The cat chased the mouse. |
| Passive | The mouse was chased by the cat. |
The Core Rule of Passive Formation
Active: Subject + Verb + Object Passive: Object (becomes subject) + be (in correct tense) + Past Participle (V3) + by + Agent (original subject)
Active: Ram wrote the letter. Passive: The letter was written by Ram.
Steps to Change Active → Passive
- Move the object to the subject position
- Add the correct form of "be" (matching the tense)
- Use the past participle (V3) of the main verb
- Add "by + original subject" (can be omitted if unknown/unimportant)
Voice Across Tenses
| Tense | Active | Passive |
|---|---|---|
| Simple Present | She writes a letter. | A letter is written by her. |
| Simple Past | She wrote a letter. | A letter was written by her. |
| Simple Future | She will write a letter. | A letter will be written by her. |
| Present Continuous | She is writing a letter. | A letter is being written by her. |
| Past Continuous | She was writing a letter. | A letter was being written by her. |
| Present Perfect | She has written a letter. | A letter has been written by her. |
| Past Perfect | She had written a letter. | A letter had been written by her. |
| Future Perfect | She will have written a letter. | A letter will have been written by her. |
When to Use Passive Voice
| When | Example |
|---|---|
| The doer is unknown | "The window was broken." (we don't know who) |
| The doer is unimportant | "The bridge was built in 1920." |
| In formal/scientific writing | "The solution was heated to 100°C." |
| To emphasise the receiver | "The president was elected by a landslide." |
Object Pronoun Changes
When the subject moves to "by + object" position, pronouns change:
| Subject Pronoun | Object Pronoun (after "by") |
|---|---|
| I | me |
| he | him |
| she | her |
| they | them |
| we | us |
Active: He wrote the letter. Passive: The letter was written by him.
Common Mistakes
| Mistake | Fix |
|---|---|
| Using V2 instead of V3 | "The cake was baked" not "was bake" or "was baked" correctly — ensure it's V3 |
| Wrong "be" form for tense | Simple past → was/were; present → is/are |
| Keeping subject pronoun | "...by he" |
| Omitting "be" | "The letter written by him." |
Quick Check
- Change to passive: "The teacher corrects the papers."
- Change to active: "The match was won by our team."
- What tense is: "The homework had been completed by all students."?
- Why would a scientist write "The sample was heated" instead of "I heated the sample"?
- Stretch: Rewrite these in passive voice: (a) "They will announce the results tomorrow." (b) "She has written three novels." (c) "The government is building new roads."
Key Takeaways (TL;DR)
- What is Voice?
- The Core Rule of Passive Formation
- Steps to Change Active → Passive
- Voice Across Tenses
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