Advanced Grammar Challenge: The Subject-Verb Agreement Conjugator

Here's an example sentence for the Advanced Grammar Challenge: "The cat purr's is on the mat."

What's wrong with it?

Is it a subject-verb agreement problem or something else?

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Rules to Keep in Mind:

• Make sure the subject and verb agree in number (singular/plural).
• Ensure the subject-verb agreement is correct for the present, past, and future tenses.
• Watch out for irregular verbs that don't follow the usual rules.