Select the option that expresses the given sentence in passive voice. He must deliver pizza.
- (a)Pizza can be delivered by him.
- (b)Pizza must be delivered by him.
- (c)Pizza has to be delivered by him.
- (d)Pizza have to be delivered by him.
Answer
Why
Correct — B. The rule for a modal + bare infinitive is to keep the modal and put be + past participle after it.
must deliver → must be delivered
object pizza → subject of the passive
subject He → agent by him
That gives "Pizza must be delivered by him.", which is option (b).
The modal must is carried across untouched. Changing voice moves the object to the front — it does not license a different modal.
Why the others are wrong
- (a)Pizza can be delivered by him. — The structure is sound, but can replaces obligation with ability or permission. A voice change must preserve the original modal, and the sentence says must.
- (c)Pizza has to be delivered by him. — has to also expresses obligation, but it is a different verb form substituted for the modal. The passive of must is must be, not has to be.
- (d)Pizza have to be delivered by him. — Two faults at once: have does not agree with the singular subject pizza, and have to again swaps out the modal must.
Concept
Voice change with a modal is mechanical. The modal itself never changes — only what follows it does.
Active: subject + modal + V1 + object.
Passive: object + modal + be + V3 + by + agent.
So can help becomes can be helped, should send becomes should be sent, and must deliver becomes must be delivered.
Options that quietly swap the modal for a near neighbour are the standard trap, because has to and must mean nearly the same thing in speech and are still not interchangeable in a voice-change answer.
The original sentence has no article before pizza, and the keyed passive keeps it that way. Do not reject an option for a missing the when the active did not have one either.
Key facts
- The passive of a modal is modal + be + V3, as in must be delivered and should be finished.
- Must expresses obligation while can expresses ability or permission, so they are not interchangeable.
- Have to and has to are semi-modals that carry obligation but are not the passive form of must.
Study next
Common traps
- Accepting has to be delivered because it means the same thing, when the exam wants the modal itself preserved.
- Overlooking the agreement slip in Pizza have to be delivered, where the singular subject needs has.
SSC gives a short active sentence and four passives that differ in one element — tense, modal or agreement — so compare the options against each other before choosing.
Voice-change items also run at 11 Sep 2024, 09:00, English Q.11 (Ravi will play the match.) and 10 Sep 2024, 12:30, English Q.17.
Related PYQs
No directly related past PYQ was found.