The active voice sentence is "I will keep your secret." Choose the option that best expresses this sentence in the passive voice.

Introduction / Context:
This question focuses on converting a simple future tense sentence in active voice into a clear, natural passive voice sentence. The original statement promises confidentiality, with the speaker ("I") acting as the keeper of a secret. The passive form shifts the focus to "your secret," while keeping the sense of a future promise intact.

Given Data / Assumptions:

• Active sentence: I will keep your secret.
• Subject: I.
• Object: your secret.
• Verb phrase: will keep (simple future).
• Meaning: the speaker promises to guard the listener's secret in the future.

Concept / Approach:
To convert simple future active to simple future passive, we follow the pattern: subject (former object) + will be + past participle. The object "your secret" becomes the subject of the passive sentence. The verb "will keep" becomes "will be kept," and the agent phrase "by me" is added. This retains both the promise and the future time reference while changing focus.

Step-by-Step Solution:

Step 1: Identify "your secret" as the object that will become the subject in the passive structure. Step 2: Recognise that "will keep" is in simple future tense. The passive equivalent is "will be kept." Step 3: Attach the agent phrase "by me" after the verb phrase to show who will keep the secret. Step 4: Combine these elements to form the passive sentence: "Your secret will be kept by me."

Verification / Alternative check:
The passive sentence "Your secret will be kept by me" correctly preserves the future promise and the sense of confidentiality. It uses the expected future passive structure "will be kept" and correctly places "your secret" as the subject. Reading it aloud shows that it sounds formal and appropriate for exam style grammar questions.

Why Other Options Are Wrong:

Option B: "Keeping of your secret will be done by me." is cumbersome and unnatural, using an unnecessary nominal form "keeping of your secret" instead of a simple passive verb. Option C: "Your secret would be kept by me." uses "would," which introduces a conditional or less definite tone, changing the sense of a firm promise. Option D: "I will be keeping the secret of you." remains in active voice and is also awkward in wording ("secret of you"). Option E: "Your secret is going to be kept by me." uses a "be going to" future form, which is grammatically possible but does not match the simple future structure of the original as closely as "will be kept."

Common Pitfalls:
Learners sometimes confuse "will be kept" with "would be kept" or mix forms like "is going to be kept," thus altering nuance or shifting the tense pattern. Others try to create passive forms using expressions like "keeping will be done," which sound heavy and unnatural. Remember that for simple future, the normal passive pattern is straightforward: "will be + past participle."

Final Answer:
The correct passive voice sentence is Your secret will be kept by me.