Here are some examples of indefinite pronouns:
Singular:
* Somebody, anybody, everybody, nobody: These refer to an unspecified person.
* Something, anything, everything, nothing: These refer to an unspecified thing.
* Each, either, neither, one, another: These refer to a single unspecified item or person.
* All, any, most, some, none: These refer to an unspecified amount or quantity.
Plural:
* Several, few, many, both, others: These refer to a unspecified number of things or people.
Note: Indefinite pronouns can sometimes be singular or plural depending on context. For example, "everyone" is singular, while "all" can be singular or plural depending on what it refers to.
Here are some examples of sentences using indefinite pronouns:
* Someone stole my wallet. (The pronoun "someone" refers to an unspecified person.)
* Everything is going to be alright. (The pronoun "everything" refers to all things in general.)
* Few people attended the meeting. (The pronoun "few" refers to a small number of people.)
* Many students enjoy learning. (The pronoun "many" refers to a large number of students.)
It's important to remember that while indefinite pronouns don't need a specific antecedent, they must agree in number with the verb they modify.