Final answer:
Pronoun case refers to the grammatical function of pronouns, including subjective, objective, and possessive case. Subject/verb agreement is important when using pronouns, with exceptions for certain nouns. Clarity is also crucial, and indefinite pronouns can take a singular or plural verb.
Step-by-step explanation:
Pronoun case refers to the grammatical function of the pronoun in a sentence. Pronouns that are the subjects of a sentence are written in the subjective case, while pronouns that are objects of a sentence or preposition are written in the objective case. Possessive pronouns show ownership and are written in the possessive case.
When using pronouns, it is important to ensure subject/verb agreement. Singular subjects must have singular verbs, and plural subjects must have plural verbs. However, there are some exceptions to this rule, such as certain nouns like civics and mathematics, which take a singular verb.
Clarity is also important when using pronouns. It is best to use gender-neutral pronouns or clarify the reference when there might be confusion. Additionally, indefinite pronouns like all, any, enough, more, most, none, and some can take a singular or plural verb depending on the word they refer to.