Choose the correct passive form of the given sentence:
The new principal has introduced two extra library periods for Class 12.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Two extra library periods have been introduced for Class 12 by the new principal.
Passive of the present perfect (has changes to have):
| Change | Active | Passive | Why |
|---|---|---|---|
| Object becomes subject | two extra library periods | Two extra library periods | The library periods receive the action, so they become the subject. |
| Tense kept | has introduced | have been introduced | “Has introduced” is in the present perfect, so the passive stays in the present perfect: has / have been + past participle (V3). “Have” because the periods are many. “Has” in the active went with “principal”. |
| Agent (by ...) | The new principal | by the new principal | The principal is named, so the doer comes after “by”. |
| Full sentence | The new principal has introduced two extra library periods for Class 12. | Two extra library periods have been introduced for Class 12 by the new principal. |
Other present perfect sentences change the same way. Check whether the new subject is one or many. Example: Ritu has watered the plants. → The plants have been watered by Ritu.
Why the Other Options are Incorrect?
Option 2: Two extra library periods has been introduced by the new principal for Class 12. — Incorrect. “Has” does not agree with the plural “periods”. It must be “have”.
Option 3: For Class 12, two extra library periods had been introduced by the new principal. — Incorrect. “Had been introduced” is the past perfect. The active “has introduced” is the present perfect.
Option 4: Two extra library periods have introduced by the new principal for Class 12. — Incorrect. “Been” is missing. “Have introduced” is active, as if the periods introduced something.