Final answer:
Compound subjects involve combining multiple nouns using coordinating conjunctions to form the subject of a sentence.
Explanation:
Compound subjects in a sentence refer to having more than one person, place, or thing as the subject. They are formed by combining two or more nouns with coordinating conjunctions like and, or, or nor. When using a compound subject with and, the verb form becomes plural, as seen in sentences like 'Desmond and Maria are friends.'
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