A subject or the main actor of a sentence that contains more than one person, place, or thing combined with the word "and" is referred to as:
A compound subject is a sentence that contains more than one noun or pronoun that is joined by the conjunction, "and."
For instance, in the sentence, "Mary and John have been friends for many years," the compound subject is seen in the use of two nouns, "Mary and John" at the beginning of the sentence.
A compound subject is necessary when the author wants to discuss a complex subject.
Learn more about compound subjects here:
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