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Object–Subject Transformation

Introduction

The Object-Subject Transformation is the foundation of Active and Passive Voice conversion. It teaches how to switch the focus of a sentence from the doer of the action (subject) to the receiver of the action (object). This pattern is widely used in grammar-based questions and helps improve sentence variety and precision.

Pattern: Object–Subject Transformation

Pattern

In passive voice, the object of the active sentence becomes the subject of the passive sentence.

The verb form changes to "be + past participle" and the original subject is introduced with "by".

Formula:
Active: Subject + Verb + Object
Passive: Object + be + Verb (V3) + by + Subject

Step-by-Step Example

Question

Convert the following active sentence into passive voice:
The teacher teaches English.

Options:
A. English is taught by the teacher.
B. English was taught by the teacher.
C. English will be taught by the teacher.
D. English has been taught by the teacher.

Solution

  1. Step 1: Identify the parts of the sentence.

    Subject = The teacher, Verb = teaches, Object = English.

  2. Step 2: Move the object to the beginning.

    New Subject = English.

  3. Step 3: Change the verb form.

    "teaches" (present simple) → "is taught" (be + past participle).

  4. Step 4: Add the agent (by + original subject).

    → by the teacher.

  5. Final Answer:

    English is taught by the teacher. → Option A.

  6. Quick Check:

    The focus shifts from “teacher” (doer) to “English” (receiver). ✅

Quick Variations

1. Change of tenses (e.g., “teaches” → “was taught”, “will teach” → “will be taught”).

2. Sentences with pronouns: He helps me → I am helped by him.

3. Sentences without objects cannot be converted to passive (e.g., He sleeps.).

Trick to Always Use

  • Step 1: Find the object - it becomes the new subject.
  • Step 2: Convert the verb into “be + past participle”.
  • Step 3: Add “by + original subject”.
  • Step 4: Adjust tense correctly (is/was/will be/etc.).

Summary

Summary

In the Object-Subject Transformation pattern:

  • The object becomes the new subject.
  • The verb takes the form be + past participle.
  • The original subject follows with by.
  • Only transitive verbs (verbs with objects) can form passive voice.

Practice

(1/5)
1. Convert into passive voice:<br>He writes a letter.
easy
A. A letter is written by him.
B. A letter was written by him.
C. A letter will be written by him.
D. A letter has been written by him.

Solution

  1. Step 1: Identify the sentence parts.

    Subject = He; Verb = writes; Object = a letter.

  2. Step 2: Move the object to the beginning.

    New subject = A letter.

  3. Step 3: Change the verb form.

    ‘writes’ (present simple) → ‘is written’ (is + past participle).

  4. Step 4: Add the agent.

    → by him.

  5. Final Answer:

    A letter is written by him. → Option A.

  6. Quick Check:

    Present simple passive uses ‘is + V3’ and the focus shifts to the object. ✅
Hint: Present simple → is/am/are + past participle.
Common Mistakes: Using ‘was written’ instead of ‘is written’ for present tense.
2. Choose the correct passive form:<br>The manager approved the proposal.
easy
A. The proposal is approved by the manager.
B. The proposal was approved by the manager.
C. The proposal will be approved by the manager.
D. The proposal has been approved by the manager.

Solution

  1. Step 1: Identify tense and parts.

    Verb ‘approved’ = past simple; Subject = the manager; Object = the proposal.

  2. Step 2: Move object to front.

    Object = The proposal → new subject.

  3. Step 3: Apply passive rule.

    Past simple → was/were + past participle → was approved.

  4. Step 4: Add agent.

    → by the manager.

  5. Final Answer:

    The proposal was approved by the manager. → Option B.

  6. Quick Check:

    Past simple passive correctly uses ‘was approved’. ✅
Hint: Past simple → was/were + past participle.
Common Mistakes: Using present auxiliary ‘is’ instead of ‘was’.
3. Identify the correct passive voice:<br>The chef prepared the meal.
easy
A. The meal was prepared by the chef.
B. The meal has been prepared by the chef.
C. The meal will be prepared by the chef.
D. The meal is prepared by the chef.

Solution

  1. Step 1: Identify the tense.

    ‘Prepared’ = past simple; Subject = the chef; Object = the meal.

  2. Step 2: Move object to subject position.

    Object = The meal → new subject.

  3. Step 3: Change the verb form.

    Past simple → was/were + past participle → was prepared.

  4. Step 4: Add agent.

    → by the chef.

  5. Final Answer:

    The meal was prepared by the chef. → Option A.

  6. Quick Check:

    Past action correctly uses ‘was prepared’. ✅
Hint: Past simple → was/were + past participle.
Common Mistakes: Choosing a future or present form instead of past passive.
4. Change into passive voice:<br>The police have caught the thief.
medium
A. The thief is caught by the police.
B. The thief was caught by the police.
C. The thief will be caught by the police.
D. The thief has been caught by the police.

Solution

  1. Step 1: Identify tense and parts.

    ‘Have caught’ = present perfect; Subject = the police; Object = the thief.

  2. Step 2: Move object to subject place.

    New subject = The thief.

  3. Step 3: Apply passive rule.

    Present perfect → has/have been + past participle → has been caught.

  4. Step 4: Add agent.

    → by the police.

  5. Final Answer:

    The thief has been caught by the police. → Option D.

  6. Quick Check:

    Present perfect passive uses ‘has/have been + V3’ - correct here. ✅
Hint: Present perfect → has/have been + past participle.
Common Mistakes: Using past simple (‘was caught’) instead of present perfect passive when original is ‘have/has + V3’.
5. Select the correct passive sentence:<br>The company is launching a new product.
medium
A. A new product was launched by the company.
B. A new product is launched by the company.
C. A new product is being launched by the company.
D. A new product has been launched by the company.

Solution

  1. Step 1: Identify tense.

    ‘Is launching’ = present continuous; Subject = the company; Object = a new product.

  2. Step 2: Move object first.

    Object = a new product → becomes subject.

  3. Step 3: Change verb.

    Present continuous → is/am/are being + past participle → is being launched.

  4. Step 4: Add agent.

    → by the company.

  5. Final Answer:

    A new product is being launched by the company. → Option C.

  6. Quick Check:

    Continuous passive requires ‘being + V3’ - correct here. ✅
Hint: Present continuous → is/am/are being + past participle.
Common Mistakes: Omitting ‘being’ in continuous passive forms.

Mock Test

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