Select the option that expresses the given sentence in passive voice.

The sewage water smells foul.

Passive construction is not possible.

The correct answer is Passive construction is not possible.

The sentence The sewage water smells foul is in the active voice. The subject of the sentence is "sewage water" and the verb is "smells." The verb "smells" is an intransitive verb, which means that it does not take an object. Therefore, it is not possible to form a passive sentence with this verb.

The other options are incorrect because:

• Foul is smelt by the sewage water. This sentence is in the passive voice, but the subject of the sentence is "foul." The subject of the sentence should be "sewage water."
• The sewage water is foul when it is smelt. This sentence is in the active voice, but the verb "is" is used as a linking verb, which means that it does not show an action. The verb "is" should be replaced with a verb that shows an action, such as "smells."
• The sewage water has a foul smell. This sentence is in the active voice, but the verb "has" is used as a linking verb, which means that it does not show an action. The verb "has" should be replaced with a verb that shows an action, such as "smells."