Change of voice: Which option correctly changes the active sentence "The choir really enjoys that piece" into the passive voice?

Introduction / Context:
This question checks your ability to convert an active sentence into a natural passive form. The active sentence uses a simple present tense with a singular subject and object. A correct passive version must preserve tense, number, and meaning while placing the original object in the subject position.

Given Data / Assumptions:
- Active sentence: "The choir really enjoys that piece." - Subject: "The choir". - Verb: "enjoys" (simple present). - Object: "that piece". - We must form a passive sentence using "that piece" as the new subject.

Concept / Approach:
To convert from active to passive in the simple present, we use "is" or "are" plus the past participle of the main verb. The choice of "is" or "are" depends on whether the new subject is singular or plural. "That piece" is singular, so we use "is enjoyed". We then add "by the choir" to show the original subject as the agent. Adverbs such as "really" should be placed in a natural position, often between the auxiliary and the main verb.

Step-by-Step Solution:
Step 1: Identify the object of the active sentence: "that piece". This will become the subject in the passive sentence. Step 2: Form the passive auxiliary: "that piece is" because "piece" is singular and the tense is simple present. Step 3: Use the past participle "enjoyed" as the main verb in passive. Step 4: Insert the adverb "really" in a natural position: "is really enjoyed". Step 5: Add the agent phrase "by the choir". The complete passive sentence is "That piece is really enjoyed by the choir."

Verification / Alternative check:
Check agreement and meaning. The original says that the choir enjoys the piece. The passive says that the piece is enjoyed by the choir. The time (simple present), the participants, and the idea of enjoyment all remain unchanged. The adverb "really" still emphasises the degree of enjoyment. This shows that option B reproduces the original sentence accurately in passive voice.

Why Other Options Are Wrong:
Option A uses "are" with singular "piece", causing subject verb disagreement. Option C uses the noun "enjoyment" with "is done", which sounds unnatural and bureaucratic rather than a simple passive conversion. Option D uses "enjoying of" plus "is done", again producing an awkward nominal phrase instead of a standard passive verb form.

Common Pitfalls:
A common mistake is to think that any sentence containing "by" must be passive. True passive voice uses a form of "be" plus the past participle, not gerunds or abstract nouns like "enjoyment". When changing voice, always start from the object, select the appropriate form of "be", add the participle, and only then attach the "by" phrase if needed.

Final Answer:
The correct passive form is "That piece is really enjoyed by the choir."