Compound subjects can take singular or plural verbs, subject-verb agreement is essential for grammatical correctness.
Compound subjects take singular or plural verbs depending on the conjunction (and, or) or the right-most subject. For example, 'Yoga and meditation are effective' uses a plural verb, while 'Macaroni and cheese is my favorite meal' uses a singular verb.
Agreement when words come between subject and verb: The verb must agree with the subject even when words and phrases separate them, like 'The cost of the flights is prohibitive.'
Subject-verb agreement ensures that the verb form matches the subject's number. Singular subjects take singular verbs, and plural subjects take plural verbs for correct agreement.
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