In this English grammar question, a sentence is given in active voice. Select the option that best expresses the same idea in passive voice. Sentence: "Grandmother is knitting a sweater for you."

Introduction / Context:

The original sentence describes an action that is in progress now. It says that grandmother is knitting a sweater for you. The question asks for the passive voice version that keeps the present continuous meaning and shows the sweater as the subject of the sentence.

Given Data / Assumptions:

- Original sentence: "Grandmother is knitting a sweater for you."

- Subject in the active sentence: "Grandmother".

- Object: "a sweater". The phrase "for you" shows the beneficiary.

- The tense is present continuous: "is knitting".

- We need a passive sentence that keeps the action in progress and preserves the idea that you will receive the sweater.

Concept / Approach:

For present continuous passive, the pattern is "is being plus past participle" or "are being plus past participle". The object of the active sentence, "a sweater", becomes the subject. The new verb phrase is "is being knitted". The phrase "for you" remains at the end, and the original subject "grandmother" appears in a "by" phrase.

Step-by-Step Solution:
Step 1: Identify subject, verb, and object. Subject: grandmother. Verb phrase: is knitting. Object: a sweater. Extra phrase: for you. Step 2: Move "a sweater" into the subject position for the passive sentence. Step 3: Form the present continuous passive "is being knitted". Step 4: Keep "for you" to show the person who will receive the sweater. Step 5: Add "by grandmother" to indicate who is doing the knitting and confirm that the action is still in progress.

Verification / Alternative check:

The sentence "A sweater is being knitted for you by grandmother." uses the correct passive continuous pattern, keeps the present time reference, and includes both the beneficiary and the agent. The meaning matches the original, but it now focuses on the sweater instead of grandmother.

Why Other Options Are Wrong:

Several options change the tense to present perfect, future, or past continuous, which alters the time and nature of the action. Others keep the sentence in active voice and just rearrange the words, which does not satisfy the requirement for passive voice. Some also misplace the phrase "for you" in a way that sounds unnatural. Because of these changes, they are not correct passive equivalents.

Common Pitfalls:

Learners often skip the word "being" when forming passive continuous tenses, which leads to incomplete forms like "is knitted". Another common issue is confusing when to use "is" or "are", which depends on whether the new subject is singular or plural. Students may also try to keep the same word order as in the active sentence and simply add "by", which does not produce a proper passive structure. Following the pattern "subject plus is being plus past participle" helps avoid these mistakes.

Final Answer:

The correct passive voice sentence is "A sweater is being knitted for you by grandmother."