Which of the following sentences is grammatically incorrect?

Question

Accepted Answer

Option 2 is grammatically incorrect because it contains an error in the formation of the question tag. The sentence "You are a mechanic, isn't it?" uses "isn't it" as the question tag, which is incorrect. In English grammar, the question tag should match the subject and the auxiliary verb of the main clause. Since the main clause is "You are a mechanic," the correct question tag should be "aren't you?" Therefore, the correct sentence should be "You are a mechanic, aren't you?"

Now, let's explain why each of the other options is correct:

1. "Eistein was the greatest scientist of our century." - This sentence is grammatically correct. It uses the past tense "was" appropriately to refer to Albert Einstein, who is widely recognized as one of the greatest scientists of the 20th century. The sentence structure and word choice are correct.

3. "Trespassers will be prosecuted." - This sentence is also grammatically correct. It uses the future tense "will be prosecuted" to indicate what will happen to trespassers. The sentence is clear and concise, with no grammatical errors.

4. "Das Kapital is one of the most important books ever written." - This sentence is grammatically correct. It correctly uses the present tense "is" to describe "Das Kapital" as one of the most important books. The phrase "ever written" is also correctly used to emphasize the significance of the book.

In summary, Option 2 is the only sentence with a grammatical error due to the incorrect question tag, making it the correct choice for the grammatically incorrect sentence.