An indefinite pronoun is a pronoun that does not refer to any specific person, thing, amount, or idea. Instead, it refers to non-specific or unknown entities in a general way. Indefinite pronouns are commonly used when the exact identity of the subject or object is unclear or when you want to make a general statement.

Here are some common examples of indefinite pronouns:

1. Singular Indefinite Pronouns:

   - Someone: Refers to an unspecified person.

   - Something: Refers to an unspecified thing or idea.

   - Somewhere: Refers to an unspecified place.

   - Anyone: Refers to any unspecified person.

   - Anything: Refers to any unspecified thing or idea.

   - Anywhere: Refers to any unspecified place.

   - Nobody: Refers to no person.

   - Nothing: Refers to no thing or idea.

   - Nowhere: Refers to no place.

2. Plural Indefinite Pronouns:

   - Some: Refers to an unspecified number of people, things, or ideas.

   - Many: Refers to a large but unspecified number of people, things, or ideas.

   - Few: Refers to a small but unspecified number of people, things, or ideas.

   - Several: Refers to an unspecified but more than a few number of people, things, or ideas.

   - All: Refers to every person, thing, or idea in a group.

   - Both: Refers to two unspecified items or people.

   - None: Refers to no people, things, or ideas in a group.

3. Indefinite Pronouns That Can Be Singular or Plural:

   - All: Can refer to a singular or plural group.

   - Some: Can refer to a singular or plural group.

   - Any: Can refer to a singular or plural group.

   - None: Can refer to a singular or plural group.

Indefinite pronouns are versatile and can be used in various contexts to avoid specifying exact details or when you're talking about things in a general or non-specific manner. Their usage depends on the context of the sentence.