What are indefinite pronouns and how do they function as determiners?

Indefinite pronouns are a type of pronoun that refer to non-specific or unidentified people or things. They are used when we do not know or do not need to specify the exact identity of the noun being referred to. Indefinite pronouns include words such as "someone," "anyone," "everyone," "something," "anything," "nothing," "all," "each," "both," "few," "many," "several," and "none."

Indefinite pronouns can also function as determiners in a sentence. As determiners, they come before a noun and modify it to indicate quantity or lack of specificity. They help to determine or specify the noun they are referring to.

For example:
- "Someone called for you." Here, "someone" is an indefinite pronoun functioning as a determiner, modifying the noun "called" to indicate that an unidentified person made the call.
- "I have several books on my shelf." In this sentence, "several" is an indefinite pronoun acting as a determiner, specifying the quantity of books without providing an exact number.

Indefinite pronouns can also be used as pronouns on their own, without a noun following them. In such cases, they function as the subject or object of a sentence.

For example:
- "Everyone is invited to the party." Here, "everyone" is an indefinite pronoun functioning as the subject of the sentence.
- "I didn't see anyone at the park." In this sentence, "anyone" is an indefinite pronoun functioning as the object of the verb "see."

In summary, indefinite pronouns are pronouns that refer to non-specific or unidentified people or things. When used as determiners, they come before a noun and modify it to indicate quantity or lack of specificity. They play an important role in determining or specifying the noun they are referring to.