Who designed a car?
Correct answer: C. By whom a car was designed?
- A. By whom a car designed?
- B. By whom a car had designed?
- C. By whom a car was designed?
- D. By whom a car was being designed?
Explanation
The simple past passive of “designed” is was designed, and the question form begins “By whom.” “Had designed” lacks the required passive auxiliary.
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About Active and Passive Voice
Active voice presents the doer as the subject, while passive voice presents the receiver of the action and uses an appropriate form of “be” with the past participle. Questions cover tense changes, modal verbs, omitted agents and sentences that cannot be passivized because they lack a suitable object.
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