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Modal Verbs in Passive

Introduction

The Modal Verbs in Passive pattern helps you transform sentences containing modal auxiliaries (like can, should, must, may, might, could, etc.) into passive voice. This is a common question type in competitive exams, where the focus is on maintaining both the modal meaning and correct verb structure.

Understanding this transformation ensures grammatical accuracy and formal tone, especially in official or instructional writing.

Pattern: Modal Verbs in Passive

Pattern

All modal verbs in passive form follow the same structure - Modal + be + past participle (V₃).

Formula:
Active: Subject + Modal + Verb + Object
Passive: Object + Modal + be + V3 + by + Subject

Step-by-Step Example

Question

Convert the following active sentence into passive voice:
You should follow the rules.

Options:
A. The rules should be followed.
B. The rules must be followed.
C. The rules can be followed.
D. The rules were followed.

Solution

  1. Step 1: Identify the modal verb.

    Modal = should; Main verb = follow; Object = the rules.

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

    New subject = The rules.

  3. Step 3: Apply passive rule.

    Modal + be + V3 → should + be + followed.

  4. Step 4: Add or omit agent (optional).

    Here, agent “by you” is unnecessary for general instruction.

  5. Final Answer:

    The rules should be followed. → Option A.

  6. Quick Check:

    Structure fits “Modal + be + V₃” rule perfectly. ✅

Quick Variations

Common Modal Verbs in Passive Voice
Active VoicePassive VoiceExplanation
He can solve this problem.This problem can be solved by him.“can” stays, add “be + V₃”
They must complete the work.The work must be completed by them.“must + be + V₃” for necessity
We may discuss the issue later.The issue may be discussed later.“may” keeps possibility tone
You could help the team.The team could be helped by you.“could + be + V₃” for past ability or possibility
They should obey the rules.The rules should be obeyed by them.“should + be + V₃” for moral obligation

Trick to Always Use

  • Step 1: Identify the modal verb (can, must, may, etc.).
  • Step 2: Keep the modal unchanged.
  • Step 3: Add “be” after the modal.
  • Step 4: Change the main verb to its past participle (V₃) form.
  • Step 5: Add “by + subject” (optional).

Summary

Summary

  • All modals (can, could, should, must, may, might, will, shall) use be + V₃ in passive voice.
  • The modal itself never changes its form.
  • The meaning (possibility, necessity, obligation) remains the same in passive.
  • Agents (“by someone”) are often omitted if not important.

Practice

(1/5)
1. Convert into passive voice:<br>He can solve this problem.
easy
A. This problem is solved by him.
B. This problem can be solved by him.
C. This problem will be solved by him.
D. This problem must be solved by him.

Solution

  1. Step 1: Identify the modal verb.

    Modal = can; Verb = solve; Object = this problem.

  2. Step 2: Move object to subject position.

    Object → new subject = This problem.

  3. Step 3: Apply modal passive structure.

    Modal + be + V3 → can + be + solved.

  4. Step 4: Add agent.

    → by him.

  5. Final Answer:

    This problem can be solved by him. → Option B.

  6. Quick Check:

    ‘can be solved’ fits the pattern modal + be + past participle. ✅
Hint: Keep modal same; add ‘be’ and past participle.
Common Mistakes: Omitting ‘be’ after the modal.
2. Choose the correct passive form:<br>You must complete the project.
easy
A. The project must be completed by you.
B. The project should be completed by you.
C. The project can be completed by you.
D. The project has been completed by you.

Solution

  1. Step 1: Identify modal verb.

    Modal = must; Main verb = complete; Object = the project.

  2. Step 2: Move object to subject position.

    Object → new subject = The project.

  3. Step 3: Convert to passive.

    Modal + be + V3 → must + be + completed.

  4. Step 4: Add agent.

    → by you.

  5. Final Answer:

    The project must be completed by you. → Option A.

  6. Quick Check:

    ‘Must be completed’ preserves the obligation meaning. ✅
Hint: Modal + be + past participle = passive form.
Common Mistakes: Replacing ‘must’ with another modal like ‘should’.
3. Identify the correct passive form:<br>We should help the poor.
easy
A. The poor should be helped.
B. The poor must be helped.
C. The poor are helped.
D. The poor will be helped.

Solution

  1. Step 1: Find the modal verb.

    Modal = should; Verb = help; Object = the poor.

  2. Step 2: Move object to subject position.

    New subject = The poor.

  3. Step 3: Apply passive structure.

    Modal + be + V3 → should be helped.

  4. Step 4: Agent omitted (general statement).

  5. Final Answer:

    The poor should be helped. → Option A.

  6. Quick Check:

    ‘Should be helped’ fits moral duty context and keeps the modal unchanged. ✅
Hint: In general truths, drop the ‘by’ phrase.
Common Mistakes: Using ‘must’ instead of ‘should’.
4. Change into passive voice:<br>They may announce the results tomorrow.
medium
A. The results must be announced tomorrow.
B. The results are announced tomorrow.
C. The results may be announced tomorrow.
D. The results were announced tomorrow.

Solution

  1. Step 1: Identify modal.

    Modal = may; Verb = announce; Object = the results.

  2. Step 2: Move object to subject position.

    New subject = The results.

  3. Step 3: Convert to passive.

    Modal + be + V3 → may be announced.

  4. Step 4: Time phrase remains unchanged.

    → tomorrow.

  5. Final Answer:

    The results may be announced tomorrow. → Option C.

  6. Quick Check:

    Possibility is preserved in passive by keeping the modal. ✅
Hint: May/might + be + past participle = passive possibility.
Common Mistakes: Replacing ‘may’ with ‘must’.
5. Select the correct passive sentence:<br>We could not find the key.
medium
A. The key should not be found.
B. The key was not found.
C. The key is not found.
D. The key could not be found.

Solution

  1. Step 1: Identify the modal.

    Modal = could; Verb = find; Object = the key.

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

    New subject = The key.

  3. Step 3: Convert to passive (negative form).

    Modal + not + be + V3 → could not be found.

  4. Step 4: Omit agent.

    ‘By us’ is unnecessary here.

  5. Final Answer:

    The key could not be found. → Option D.

  6. Quick Check:

    Negative passive places ‘not’ after the modal: could not be + V3. ✅
Hint: For negatives, place ‘not’ after the modal: modal + not + be + V3.
Common Mistakes: Placing ‘not’ before ‘be’.

Mock Test

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