on Writing Forward:

The rule is simple: singular subjects take singular verbs and plural subjects take plural verbs.

But sometimes it’s difficult to tell whether a subject is singular or plural. That’s why subject-verb agreement errors crop up in so many pieces of writing.

Making matters worse is the fact that most people don’t know what subject-verb agreement means. In fact, too many people don’t know a subject from a verb.

When you’re fixing up your sentences and making sure they are correct, it helps to know the parts of speech, how to conjugate a verb, and how to diagram a sentence (so you can identify the subject). If you understand all those basic elements of language, then you can easily make sure your subjects and verbs are in agreement.

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