Choose the correct option to change the following sentence from Active Voice to Passive Voice:
They have postponed the concert.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → The concert has been postponed by them.
Passive of the present perfect:
| Change | Active | Passive | Why |
|---|---|---|---|
| Object becomes subject | the concert | The concert | “The concert” becomes the subject. |
| Tense kept | have postponed | has been postponed | Present perfect “have postponed” becomes has been + past participle: “has been postponed” (“has” agrees with the singular “concert”). |
| Agent (by ...) | They | by them | “They” becomes “by them”. |
| Full sentence | They have postponed the concert. | The concert has been postponed by them. |
Example: She has written a letter. → A letter has been written by her.
Why the Other Options are Incorrect?
Option 2: The concert is postponed by them. — Incorrect. "Is postponed" is the simple present passive. The tense changes.
Option 3: The concert is postponed. — Incorrect. The tense changes to the simple present.
Option 4: The concert may be postponed by them. — Incorrect. "May" adds a possibility. The active sentence says the concert has already been postponed.