Active & Passive Voice Rules With Examples — Voice Change Made Easy

Voice is one of the most important grammar topics in school and standardized exams worldwide. Questions on voice change appear regularly in CBSE, ICSE, Cambridge, and other English exams. Let's understand active and passive voice with clear rules and plenty of examples.

What is Active Voice?

In Active Voice, the subject (doer) of the action performs the verb. The action is active and direct.

Formula: Subject + Verb + Object Examples:

Rahul wrote a letter.
The teacher explained the lesson.
The children are playing cricket.
Emma completed her project.
Scientists discovered a new element.

The subject (Rahul, teacher, children, Emma, scientists) is doing the action.

What is Passive Voice?

In Passive Voice, the object becomes the subject. The emphasis is on the action or the receiver of the action, not the doer.

Formula: Subject + Helping Verb + Past Participle + by + Agent Examples:

A letter was written by Rahul.

The lesson was explained by the teacher.

Cricket is being played by the children.

The project was completed by Emma.

A new element was discovered by scientists.

The receiver of the action becomes the subject.

Why Use Passive Voice?

You might wonder: if active voice is simpler, why use passive voice? Here are real reasons, recognized across CBSE, ICSE, Cambridge, and IB curricula:

When the doer is unknown: "The window was broken." (We don't know who broke it)
When the doer is unimportant: "The exam has been postponed." (Who postponed it doesn't matter)
For formality: "It is requested that students submit assignments on time." (More formal)
To shift focus: "The Taj Mahal was built in 1632" focuses on the monument. "Big Ben was constructed in London" emphasizes the landmark.

How to Change Active to Passive

Step-by-Step Process

Step 1: Identify the object in the active sentence (this becomes the new subject) Step 2: Move the original subject after "by" Step 3: Change the verb to past participle Step 4: Add appropriate helping verbs (is, was, are, were, etc.)

Example Transformations

Simple Present:

Active: She writes poems. → Passive: Poems are written by her.

Active: I eat rice daily. → Passive: Rice is eaten by me daily.

Simple Past:

Active: The government built this school. → Passive: This school was built by the government.

Active: Shakespeare wrote this play. → Passive: This play was written by Shakespeare.

Present Continuous:

Active: She is reading a book. → Passive: A book is being read by her.

Active: They are building a house. → Passive: A house is being built by them.

Past Continuous:

Active: He was writing an essay. → Passive: An essay was being written by him.

Present Perfect:

Active: They have finished the project. → Passive: The project has been finished by them.

Active: She has cooked lunch. → Passive: Lunch has been cooked by her.

Simple Future:

Active: We will organize a sports day. → Passive: A sports day will be organized by us.

When NOT to Change to Passive

Some sentences cannot be converted to passive voice:

Intransitive Verbs (verbs without objects): "She laughed" → Cannot be made passive

Sentences with "have": "I have a car" → Cannot be made passive

Sentences with "like," "love," "want": May be awkward in passive

Important Rules for Voice Change

Rule 1: Object Placement

The object of the active verb becomes the subject of the passive verb.

Rule 2: Helping Verbs

Add "is," "am," "are," "was," "were," "be," "being," or "been" depending on the tense.

Rule 3: Past Participle

The main verb changes to its past participle form.

Rule 4: Subject Placement

The active subject comes after "by" (the agent), or is omitted if unimportant.

Common Mistakes in Voice Change

Mistake 1: Forgetting the helping verb

Wrong: "A book written by Chetan Bhagat."

Correct: "A book was written by Chetan Bhagat."

Mistake 2: Wrong tense of helping verb

Wrong: "The window are broken by him."

Correct: "The window was broken by him."

Mistake 3: Not using past participle

Wrong: "The work is do by them."

Correct: "The work is done by them."

FAQ: Voice Questions from Exams

Do we always include "by" in passive voice?

Not always. If the agent is unknown or unimportant, we omit "by + agent." Example: "This book was published in 2020."

How do I know which tense to use in passive voice?

The tense remains the same! If it's past simple in active, it's past simple in passive. Only the helping verb changes.

Can all verbs be made passive?

No. Intransitive verbs (verbs that don't take an object) cannot be made passive. Examples: go, come, sit, laugh.

How is passive voice tested in different curricula?

CBSE emphasizes transformation, ICSE focuses on recognition and usage, Cambridge assesses practical application, and IB demands nuanced understanding across registers.

Practice Exercises

Try converting these sentences from active to passive:

The chef prepared a delicious meal.

Students are studying the lesson.

The company has launched a new product.

They will complete the project tomorrow.

The artist painted this beautiful portrait.

Master Voice Change with Practice

Understanding active and passive voice is crucial for exam success. Practice regularly to strengthen your skills.

Conclusion

Active and passive voice are tools for expressing the same idea in different ways. Master the transformation rules, practice regularly, and voice change questions will become easy. Remember: the object becomes the subject, the subject becomes the agent (or is omitted), and the verb becomes a past participle with appropriate helping verbs.

Start practicing today and watch your grammar confidence grow!