Which of the following sentences is grammatically incorrect ?

Question

Accepted Answer

Option 2, "Water changed into ice when the temperature drops below 32°F," is grammatically incorrect because it uses the past tense "changed" incorrectly. The sentence describes a general scientific fact or a universal truth. In such cases, the present simple tense should be used. The correct sentence should be: "Water changes into ice when the temperature drops below 32°F."

Here's why the other options are grammatically correct:

*   **Option 1: Electricity lights our houses and drives our machinery.** This sentence is grammatically correct because it uses the present simple tense to describe the general functions of electricity. The verbs "lights" and "drives" are correctly conjugated for the subject "electricity."

*   **Option 3: We see with our eyes, hear with our ears and smell with our nose.** This sentence is grammatically correct because it uses the present simple tense to describe general human capabilities. The verbs "see," "hear," and "smell" are correctly conjugated for the subject "we."

*   **Option 4: The earth moves round the sun.** This sentence is grammatically correct because it uses the present simple tense to describe a universal truth or a scientific fact. The verb "moves" is correctly conjugated for the singular subject "the earth."