Which sentence uses correct subject-verb agreement?

The clouds swiftly moves across the sky.
My teachers often gives homework over the weekend.
My brother always want to cook dinner.
The cat carefully steps across the fence.

The cat carefully steps across the fence.

The correct sentence that uses subject-verb agreement is: "The cat carefully steps across the fence."

The sentence that uses correct subject-verb agreement is: "The cat carefully steps across the fence."

To determine subject-verb agreement, you need to ensure that the subject and the verb agree in number. In this case, the subject is "cat" (singular), and the verb is "steps" (singular). Both the subject and the verb are in singular form, thus making the sentence grammatically correct.