Choose the sentence which is correct in structure :

Question

Accepted Answer

Option 2, "How is the world tending to become a unity?" is the correct sentence in terms of structure. Here's why:

1. **Explanation for Option 2:**
   - **Subject-Verb Agreement:** The sentence uses the correct form of the verb "is" to match the singular subject "the world." This ensures proper subject-verb agreement.
   - **Present Continuous Tense:** The phrase "is tending" correctly uses the present continuous tense, which is appropriate for describing an ongoing process or trend. This tense indicates that the world is currently in the process of becoming a unity.
   - **Question Structure:** The sentence is structured correctly as a question, starting with the question word "How," followed by the auxiliary verb "is," then the subject "the world," and finally the present participle "tending."

2. **Explanation for why other options are incorrect:**

- **Option 1: "How does the world tending to become a unity?"**
     - **Incorrect Verb Form:** The use of "does" is incorrect here because it should be followed by the base form of the verb. The correct structure would require "tend" instead of "tending," but this would change the meaning and tense of the sentence.

- **Option 3: "How will the world tending to become a unity?"**
     - **Incorrect Tense Usage:** The auxiliary verb "will" is used for future tense, but it is not followed by the base form of the verb. The sentence should use "tend" instead of "tending" if "will" is used, but this would alter the intended meaning.

- **Option 4: "How did the world tending to become a unity?"**
     - **Incorrect Verb Form:** The use of "did" requires the base form of the verb, so "tending" should be "tend." Additionally, "did" implies a completed action in the past, which does not align with the ongoing process suggested by "tending."

In summary, Option 2 is the only choice that correctly uses the present continuous tense and maintains proper subject-verb agreement, making it the correct sentence structure for expressing an ongoing trend or process.