Which if the following describes what it means when subjects and verbs agree

Answer 1

When subjects and verbs agree, it means that they must match in number (singular or plural). Specifically:

• A singular subject requires a singular verb. For example: "The cat runs fast."
• A plural subject requires a plural verb. For example: "The cats run fast."

In essence, the form of the verb should correspond to the number of the subject to maintain grammatical correctness in a sentence.