In the following question, a sentence has been given in the active voice (interrogative with a modal verb). Out of the four alternatives suggested, select the one which best expresses the same sentence in the passive voice. Who will help me?

Introduction / Context:
This question tests your ability to change an interrogative sentence from active voice to passive voice. The sentence given is "Who will help me?" This is a question with a modal verb "will" and the interrogative pronoun "who." In passive voice, "who" usually changes to "by whom," and the word order must follow standard rules for questions with auxiliaries.

Given Data / Assumptions:

• Active interrogative sentence: Who will help me?
• Subject in the active voice: who (unknown doer).
• Object: me.
• Verb phrase: will help.
• We must form a passive question with correct auxiliary placement.

Concept / Approach:
In passive voice, the object of the active sentence becomes the subject, and "who" is usually replaced by "by whom" to show the agent of the action. The basic passive pattern here is "I will be helped by whom." Because it is a question with "will," we need to invert "will" and the subject "I" to form "Will I be helped by whom?" Finally, to keep the interrogative pronoun at the beginning, we write "By whom will I be helped?" which is the most grammatically correct and formal passive form.

Step-by-Step Solution:
Step 1: Identify the object "me" and convert it to the subject form "I" for the passive sentence.Step 2: Create a passive structure: I will be helped by plus the agent phrase.Step 3: Replace the interrogative subject "who" with "by whom" to introduce the agent in the passive voice.Step 4: Invert the auxiliary "will" and the subject "I" to make a proper question structure: will I be helped.Step 5: Place "by whom" at the beginning to preserve the question form and emphasis: By whom will I be helped.

Verification / Alternative check:
If we take the passive question "By whom will I be helped?" and convert it back to active voice, we replace "I" with "me," "by whom" with "who," and take "will help" as the verb phrase. This gives us "Who will help me?" which matches the original sentence exactly. This confirms that we have preserved both meaning and grammatical correctness.

Why Other Options Are Wrong:
"By whom I shall be helped?" uses "shall" instead of "will" and does not follow proper interrogative inversion because the auxiliary should come before the subject. "By whom would I be helped?" changes the modal verb from will to would, altering the sense of future certainty. "By whom I will be helped?" again has incorrect word order for a question, as the auxiliary must precede the subject in standard English. "Who will I be helped by?" is common in informal speech but does not match the formal exam style which prefers "By whom will I be helped?" and keeps preposition and pronoun together.

Common Pitfalls:
Students often forget to change "who" to "by whom" in passive questions, or they place the auxiliary after the subject, breaking the typical interrogative structure. Another frequent error is to switch to a different modal verb by mistake. To avoid these problems, remember that in formal passive questions with "who," you usually start with "By whom" and then follow with auxiliary plus subject plus past participle.

Final Answer:
By whom will I be helped?