The correct answer is;
Both of the contestants were nervous; they kept shifting their feet.
No specific person, thing, or amount is mentioned while using an indefinite pronoun. It is ambiguous and "not certain." All, another, any, anyone/anyone, anything, each, everyone/everything, few, many, nobody, none, one, several, some, and somebody/someone is examples of common indefinite pronouns.
Personal pronouns and predicate verbs. Definition of Personal Pronoun. A personal pronoun is a word that stands in for a specific person or thing. It is a grammatical component of speech in the English language. The designated individual or thing to which the pronoun is being referred is simply referred to as the "antecedent."
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