From the given alternatives, choose the one which best expresses the sentence in Active/Passive voice.
They will inform the teacher.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → The teacher will be informed by them.
Passive of the simple future tense:
| Change | Active | Passive | Why |
|---|---|---|---|
| Object becomes subject | the teacher | The teacher | The teacher receives the action, so the teacher becomes the subject. |
| Tense kept | will inform | will be informed | “Will inform” is in the simple future, so the passive stays in the simple future. The passive form is will be + past participle (V3). |
| Agent (by ...) | They | by them | The doer moves to the end with “by”. “They” becomes “them”. |
| Full sentence | They will inform the teacher. | The teacher will be informed by them. |
Other passive forms: is/am/are + V3, was/were + V3, has been + V3, will have been + V3. Example: The guard will lock the gate. → The gate will be locked by the guard.
Why the Other Options are Incorrect?
Option 2: The teacher will inform them. — Incorrect. This is still active, and it changes the meaning. Now the teacher gives the news to them.
Option 3: The teacher are informed by them. — Incorrect. The tense changes from future to present. The active sentence has “will inform”.
Option 4: Informed will be the teacher by them. — Incorrect. The word order is wrong. The subject “the teacher” must come before “will be informed”.