ICSE Class 9 English Grammar: Active and Passive Voice Transformation

Why bother with active and passive voice?

Ever wonder why a teacher sometimes says, "The experiment was conducted by the students" instead of "The students conducted the experiment"? The choice changes the focus, and the exam loves to test that skill.

In simple words, active voice shows who does the action, while passive voice shows who receives the action. Flip the sentence, keep the meaning, and you’ve got a passive sentence.

What is active voice?

Active voice is the straightforward way of writing where the subject (the doer) comes before the verb. Think of it like a soccer player (subject) kicking the ball (object) – the action is clear and direct.

What is passive voice?

Passive voice flips the order: the object becomes the subject, and the real doer may appear after the verb with the word "by" or be omitted entirely. It’s like watching a replay where the ball is shown first, and the player appears later.

How to change an active sentence into passive

Follow these five steps – they work for most ICSE Class 9 sentences.

• Identify the object. This is the thing that receives the action.
• Move the object to the front. It now becomes the new subject.
• Choose the correct form of "to be". The tense of the original verb decides which "to be" (am, is, are, was, were, etc.) you need.
• Change the main verb to its past participle. Past participle is the verb’s "finished" form – e.g., write → written, eat → eaten.
• Add the original subject after "by" (optional). If the doer is important, keep it; otherwise you can drop it.

Worked examples for ICSE Class 9

• Active: The gardener waters the plants.
  Passive: The plants are watered (by the gardener).
• Active: The chef will prepare the meal.
  Passive: The meal will be prepared (by the chef).
• Active: The students had solved the puzzle.
  Passive: The puzzle had been solved (by the students).
• Active: Someone stole the necklace.
  Passive: The necklace was stolen.

Common pitfalls to avoid

• Using the wrong form of "to be" – remember the tense! "She sings" becomes "is sung" (wrong); the correct passive is "is sung" only if the verb is already in past participle form, otherwise it’s "is sung"? Actually correct is "is sung" for present simple: "A song is sung by her".
• Leaving out the past participle – "The book was readed" is incorrect; it should be "was read".
• Adding "by" when the doer is unknown – if you don’t know who did it, just omit the "by" phrase: "The window was broken".
• Changing the meaning – the passive must keep the original sense. "He broke the vase" cannot become "The vase broke" because that changes who performed the action.

Quick revision checklist

• Find the object → move it to the front.
• Match the tense with the right "to be" verb.
• Convert the main verb to past participle.
• Add "by" + original subject only if needed.
• Read the new sentence aloud – does it still mean the same?

📝 Likely Exam Questions

1. Convert to passive: "The teacher explains the lesson."
   Answer: The lesson is explained (by the teacher).
2. Change to active: "A new bridge was inaugurated by the mayor."
   Answer: The mayor inaugurated a new bridge.
3. Write the passive form of: "Scientists will discover a cure soon."
   Answer: A cure will be discovered soon (by scientists).
4. Identify the error in the passive sentence: "The letters are wrote by her."
   Answer: "wrote" should be the past participle "written": "The letters are written by her."
5. Explain why "The cake was eaten" is a correct passive sentence even though the doer is missing.
   Answer: In passive voice the agent is optional; the sentence still conveys a complete idea about the cake being eaten.