Change the voice: No one could solve the puzzle.
- The puzzle could not be solved.
- The puzzle cannot be solved.
- The puzzle has not been solved.
- None of these
Explanation
- The puzzle could not be solved.
- The active voice is in the simple past tense with the modal verb could.
- In passive voice, the object “the puzzle” becomes the subject, followed by could not be + past participle (solved).
- The meaning remains the same: nobody was able to solve the puzzle.
Last verified on 22-10-2026
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