Select the option that expresses the given sentence in active voice.
Let the answer sheets be collected before the bell rings.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Collect the answer sheets before the bell rings.
Active form of “Let + object + be + past participle (V3)”:
| Change | Passive | Active | Why |
|---|---|---|---|
| Order made active | Let ... be collected | Collect | “Let ... be collected” is an order in the passive. In the active, the order begins with the verb itself: “Collect”. |
| Subject becomes object | the answer sheets | the answer sheets (after the verb) | The answer sheets are the things collected, so they go after “collect”. |
| Doer understood | (no doer named) | (you) | An order is given to “you”, so “you” is not written. |
| Full sentence | Let the answer sheets be collected before the bell rings. | Collect the answer sheets before the bell rings. |
Other passive orders change back the same way: Let ... be + V3 → verb + object. Example: Let the fans be switched off. → Switch off the fans.
Why the Other Options are Incorrect?
Option 1: The answer sheets must be collected before the bell rings. — Incorrect. “Must be collected” is still passive. Only “let” is changed to “must”.
Option 3: Let the answer sheets collect before the bell rings. — Incorrect. Without “be collected”, the answer sheets seem to do the collecting. The meaning changes.
Option 4: Let us collect the answer sheets before the bell rings. — Incorrect. “Let us” makes it a suggestion that includes the speaker. The given sentence is an order to someone else.