Which sentence uses correct subject-verb agreement? a) My teacher often gives homework on the weekend. b) My brother always want to cook dinner. c) The clouds swiftly moves across the sky. d) The cat carefully steps across the fence.

The sentence that uses correct subject-verb agreement is:

a) My teacher often gives homework on the weekend.

To determine which sentence has correct subject-verb agreement, we need to make sure that the subject and the verb in the sentence agree in number (singular or plural). In sentence a), the subject "My teacher" agrees with the singular verb "gives." The singular subject "teacher" requires the singular verb "gives" to maintain subject-verb agreement.

On the other hand, in sentence b), there is a disagreement between the singular subject "brother" and the plural verb "want." To correct this, we can change the verb to its singular form, resulting in "My brother always wants to cook dinner."

In sentence c), the plural subject "clouds" should be paired with the plural verb "move" instead of the singular verb "moves." We can correct this by changing the verb to its plural form: "The clouds swiftly move across the sky."

In sentence d), the singular subject "cat" agrees with the singular verb "steps," making it grammatically correct: "The cat carefully steps across the fence."

So, the correct sentence with subject-verb agreement is a) My teacher often gives homework on the weekend.