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Voice 12 min read

Beyond the Basic Formula

Once the core passive pattern feels comfortable, competitive exams push further. They test whether you can apply it to sentences that already have a modal verb, to questions, and to orders and requests. These three cases confuse aspirants who know the basic formula perfectly well, because each one adds a small twist that the standard "object + be + V3" pattern doesn't cover on its own.

This guide gives you step-by-step rules for all three: modals, questions and imperative sentences. You'll also see the trickier modal-perfect form, the difference between "who" and "by whom", and how polite requests are usually rewritten rather than converted word for word. As always, every practice sentence here is original, written for learning, not a previous-year question.

In This Guide

1. Modals in passive voice
2. Negative modal sentences
3. Modal perfect: should have been done
4. Yes/No questions in passive
5. Wh- questions in passive
6. Imperative sentences in passive
7. 6 common traps
8. 10 practice sentences
9. Quick revision
10. Frequently asked questions

Why "Do", "Does" and "Did" Disappear

One detail confuses students before they even reach the passive form: in an active Yes/No question, "do", "does" or "did" is just a helper that carries the tense, with no meaning of its own. When you convert the sentence to a statement first, that helper simply becomes the tense of the be verb. "Does she clean the room?" is really "She cleans the room" in disguise, present tense, and that present tense reappears as "is" in the passive: "Is the room cleaned by her?" Once you see this, "do/does/did" stops feeling like a missing piece and starts feeling like information you've already used.

Modals in Passive Voice

A modal verb (can, could, may, might, must, shall, should, will, would) never changes form. It simply moves to the front of the passive verb group, followed by "be" and then V3.

Notice that "be" never changes to "is" or "was" here. After a modal, the verb always stays in its base form, so it's always "be", not "is be" or "was be".

Negative Modal Sentences

Negative sentences follow the same pattern, with "not" placed right after the modal, exactly where it sits in the active sentence.

• Active: "You must not open this file." → Passive: "This file must not be opened."
• Active: "They cannot ignore the complaint." → Passive: "The complaint cannot be ignored."
• Active: "She should not delay the payment." → Passive: "The payment should not be delayed."

The only change from the positive form is the word "not" after the modal. Everything else, the object moving to the front and "be + V3" at the end, stays the same.

Modal Perfect: "Should Have Been Done"

Modals can also combine with a perfect form to talk about the past, usually to express regret, criticism or a missed opportunity. The passive version adds "have been" after the modal, followed by V3.

• Active: "You should have submitted the report yesterday." → Passive: "The report should have been submitted yesterday."
• Active: "They could have solved this issue earlier." → Passive: "This issue could have been solved earlier."
• Active: "He must have completed the task by now." → Passive: "The task must have been completed by now."

This form appears often in essay writing and formal speech, so it's worth practising separately from the simple modal pattern in Section 1, even though the logic, modal, then a form of be, then V3, stays consistent throughout.

Yes/No Questions in Passive

Questions add one extra step: after converting the sentence as if it were a statement, you move the helping verb back to the front to rebuild the question.

1. Ignore the question word order for a moment and convert the sentence as a statement.
2. Once you have the passive statement, move the be verb or modal to the very front.
3. Add the question mark.

• "Does she clean the room?" → "Is the room cleaned by her?"
• "Can you finish this today?" → "Can this be finished by you today?"
• "Will they invite us?" → "Will we be invited by them?"

Wh- Questions in Passive

Wh- questions (who, what, when, where, why, how) follow the same two-step idea, with one extra detail: when "who" is the doer being asked about, it usually becomes "by whom" in formal passive style.

• "What did she cook for dinner?" → "What was cooked for dinner by her?"
• "When will they release the results?" → "When will the results be released?"
• "Why did he cancel the meeting?" → "Why was the meeting cancelled by him?"

In everyday spoken English, "who wrote this book" is often left as "who was this book written by", with "who" instead of "by whom" and the "by" moved to the end. Formal exam answers generally expect "by whom" at the front, so use that form unless the question specifically asks for informal style.

Negative Wh- Questions

Negative Wh- questions follow the same two-step process, with "not" carried over from the active helping verb into the passive helping verb.

• Active: "Why didn't they inform the students?" → Passive: "Why were the students not informed?"
• Active: "What hasn't she completed yet?" → Passive: "What hasn't been completed by her yet?"

Imperative Sentences in Passive

Imperative sentences give an order, a request or an instruction, and they have no visible subject in the active form ("you" is understood). Passive imperatives use a different structure built around "let".

• Active: "Close the door." → Passive: "Let the door be closed."
• Active: "Finish the work by evening." → Passive: "Let the work be finished by evening."
• Active: "Switch off the lights." → Passive: "Let the lights be switched off."

Negative orders

For a negative order, "not" goes right after "let", not after "be".

• Active: "Do not open the gate." → Passive: "Let the gate not be opened."
• Active: "Don't waste water." → Passive: "Let water not be wasted."

Requests

A polite request is usually rewritten with "You are requested to..." rather than forced into the "let" pattern, since "let" can sound like a command even for a soft request.

• Active: "Please submit your application by Friday." → Passive: "You are requested to submit your application by Friday."
• Active: "Kindly keep silence in the library." → Passive: "You are requested to keep silence in the library."

If an exam question specifically asks for the "let" structure, use it even for a polite request; otherwise, "you are requested to" is the more natural and widely accepted form for requests in formal passive writing.

A Full Worked Checklist

When a sentence combines more than one of these features, work through it in this order: first identify whether it's a statement, a question, or an order. Then handle the modal (if any) using Section 1 or 3. Then, only if it's a question, move the helping word to the front last. Doing the steps in this order prevents the most common source of confusion, trying to rebuild the question word order before the passive verb itself is correct.

6 Common Traps

10 Practice Sentences With Answers

Convert each sentence into the passive voice using the correct structure: modal, question or imperative. These are practice sentences (exam-pattern-based), not previous-year questions.

1. You must complete the assignment before Monday.
2. She can answer this question easily.
3. They should have informed the manager earlier.
4. Did the workers finish the construction?
5. Who designed this building?
6. Will the committee approve the plan?
7. Open the window.
8. Do not touch the wires.
9. Please send the documents by email.
10. You must not ignore the safety rules.

Show answers and explanations

1. The assignment must be completed before Monday. Modal + be + V3.
2. This question can be answered easily by her. Modal + be + V3.
3. The manager should have been informed earlier. Modal perfect: modal + have been + V3.
4. Was the construction finished by the workers? Statement first, then move "was" to the front.
5. By whom was this building designed? "Who" asking about the doer becomes "by whom".
6. Will the plan be approved by the committee? Modal question: move "will" to the front.
7. Let the window be opened. Imperative: let + object + be + V3.
8. Let the wires not be touched. Negative imperative: "not" right after "let".
9. You are requested to send the documents by email. Polite request, not "let".
10. The safety rules must not be ignored. Negative modal: "not" right after the modal.

Where This Fits in a Structured Plan

Modals, questions and imperatives together make up a large share of the "tricky" passive voice questions in competitive exams, precisely because they combine two skills at once: the base passive pattern and one extra transformation. A chart or a single blog post can show the pattern, but only repeated, mixed practice makes the combination automatic. If you'd like structured drills covering exactly this, along with the tense chart and error-spotting practice, The Ultimate Guide to Active & Passive Voice for Competitive Exams brings all of it together in one place. You can look at the details on the book page. The free guides in this series will still give you a solid foundation.

Quick Revision

These four patterns, along with the tense chart from our guide on passive voice rules for all tenses, cover almost every passive voice question a competitive exam can ask. The one category left is sentences that resist passive conversion altogether, which our next guide covers in full.

Frequently Asked Questions

Where to Go Next

With modals, questions and imperatives covered, the remaining gap is knowing which sentences can't be converted at all. Our next guide, sentences that cannot become passive, covers intransitive verbs and the common exceptions. If you'd like a refresher on the basics first, start with our complete guide to active and passive voice.

Recommended Companion eBook

The Ultimate Guide to Active & Passive Voice for Competitive Exams

Move beyond the mechanical active-to-passive formula to confidently recognize when passive voice is grammatically impossible.