Choose the correct alternative for the following sentence :
He must stop smoking.

Question

Accepted Answer

Option 1, "Smoking must be stopped by him," is the correct alternative for the sentence "He must stop smoking." This option accurately transforms the original sentence from active voice to passive voice while maintaining the intended meaning and grammatical structure.

1. **Explanation for Option 1:**
   - The original sentence "He must stop smoking" is in active voice, where "He" is the subject, "must stop" is the modal verb phrase, and "smoking" is the object.
   - In passive voice, the object of the active sentence becomes the subject of the passive sentence. Therefore, "smoking" becomes the subject in the passive construction.
   - The modal verb "must" remains unchanged in passive voice, and the verb "stop" is converted to its past participle form "stopped."
   - The phrase "by him" is added to indicate the doer of the action in passive voice.
   - Thus, the sentence "Smoking must be stopped by him" correctly reflects the passive voice structure while preserving the original meaning.

2. **Explanation for why other options are incorrect:**

- **Option 2: "Smoking stopped by him."**
     - This option is incorrect because it lacks the modal verb "must," which is essential to convey the necessity or obligation present in the original sentence. Additionally, the sentence is incomplete as it does not form a proper passive construction.

- **Option 3: "Smoking was stopped by order."**
     - This option is incorrect because it introduces an element ("by order") that is not present in the original sentence. It also changes the meaning by implying that smoking was stopped due to an external order, rather than by the individual's action.

- **Option 4: "Smoking should be stopped by him."**
     - This option is incorrect because it uses the modal verb "should" instead of "must." The modal verb "must" indicates a stronger sense of obligation or necessity than "should," which suggests a recommendation or advice. Therefore, this option does not accurately reflect the original sentence's intent.

In conclusion, Option 1 is the correct choice as it accurately transforms the original sentence into passive voice while maintaining the intended meaning and grammatical integrity.