Change the following sentence into active voice by choosing the correct option.
All his calculations have been proved wrong.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → They have proved all his calculations wrong.
Passive to active (present perfect, no agent):
| Change | Passive | Active | Why |
|---|---|---|---|
| Subject becomes object | All his calculations | all his calculations | The subject of the passive, “all his calculations”, becomes the object of the active sentence. |
| Tense kept | have been proved | have proved | Have been + past participle (present perfect passive) becomes have/has + past participle: “have proved”. |
| Agent (by ...) becomes subject | (no agent) | They | The passive names no agent (no “by ...”). So the active sentence uses a general subject such as “they” or “people” for the unknown doers. |
| Full sentence | All his calculations have been proved wrong. | They have proved all his calculations wrong. |
The complement wrong stays after the object.
Example: The road has been repaired. → They have repaired the road.
Why the Other Options are Incorrect?
Option 1: It has proved all his calculations wrong. — Incorrect. "It" refers to no person or thing in the sentence. An unknown agent is expressed by "they".
Option 3: We have proved all his calculations wrong. — Incorrect. "We" brings the speaker in as the doer, which the passive sentence does not say.
Option 4: All his calculations were proved wrong. — Incorrect.
- It is still in the passive voice.
- "were proved" changes the present perfect into the simple past.