A compound subject is formed by two or more nouns and the coordinating conjunctions and, or, or nor. A compound subject can be made of singular subjects, plural subjects, or a combination of singular and plural subjects.
Compound subjects combined with and take a plural verb form.
Compound subjects combined with or and nor are treated separately. The verb must agree with the subject that is nearest to the verb.
Tip
If you can substitute the word they for the compound subject, then the sentence takes the third person plural verb form.
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