To convert a sentence from active voice to passive voice, you must follow these specific steps:
- Identify the subject, verb, and object: In the sentence "Who is creating this mess?", the subject is "Who", the verb is "is creating", and the object is "this mess".
- Switch the positions: The object of the active sentence becomes the subject of the passive sentence. Hence, "this mess" moves to the beginning of the sentence.
- Determine the correct form of the verb: In passive voice, the verb form will need to include a form of "to be" and the past participle. For the present continuous tense in passive voice, use "is being" along with the past participle of "create" which is "created".
- Introduce the doer of the action: In questions, use "by whom" to indicate the doer. It's not mandatory to mention the doer in passive voice if it's unknown or irrelevant, but since it's a question, we include "by whom" at the beginning.
The conversion gives us the sentence: "By whom is this mess being created?"
Therefore, the correct alternative that expresses the given sentence in passive voice is: By whom is this mess being created?