How does agreement work with indefinite pronouns?

Agreement with indefinite pronouns is based on the number and gender of the pronoun. In general, singular indefinite pronouns take singular verbs, while plural indefinite pronouns take plural verbs. However, there are some specific rules to keep in mind.

1. Singular indefinite pronouns: Words like "everyone," "somebody," and "anyone" are considered singular indefinite pronouns. They require singular verbs and pronouns. For example:
- Everyone is going to the party.
- Somebody left their bag behind.

2. Plural indefinite pronouns: Words like "both," "few," and "many" are considered plural indefinite pronouns. They require plural verbs and pronouns. For example:
- Both of them are talented musicians.
- Many have expressed their opinions on the matter.

3. Indefinite pronouns that can be singular or plural: Words like "all," "some," and "none" can be either singular or plural, depending on the context. When they refer to a specific amount or quantity, they are singular and require singular verbs. When they refer to a larger, unspecified group, they are plural and require plural verbs. For example:
- All of the cake is gone. (singular)
- All of the students are studying. (plural)

4. Agreement with gender: Some indefinite pronouns have specific gender forms. For example, "everyone" has the gender-neutral form, while "everyone" has the masculine form and "everyone" has the feminine form. The verb and pronoun should agree with the gender of the indefinite pronoun. For example:
- Everyone is doing his or her best.
- Everyone is doing their best.

In summary, agreement with indefinite pronouns is determined by their number and, in some cases, their gender. It is important to use the appropriate verb and pronoun form to ensure grammatical agreement.