Indefinite pronouns point to people or things without naming them. Someone, anything, nobody, and everything tell you that the speaker does not want or cannot give a specific name. Compare I met a woman with I met someone. The first sentence identifies the person as a woman. The second leaves the person unknown. These pronouns often replace a noun phrase when the exact person or thing is unimportant, unknown, or intentionally left unsaid. They are different from Pronouns that refer to a clear person or thing already known in the conversation.

Question and offer uses of some forms

Usage	Explanation
Expecting a positive answer	Use someone or something in a question when you think the answer will probably be yes.
Offering help	Use something in a question when you are offering help or asking if a person wants an item.
Asking with a friendly assumption	Use somebody in a question when you expect the person can give a useful answer.

Use some- forms in questions when you expect a positive answer or when you are offering something. Would you like something to drink? sounds natural because the speaker expects acceptance. Is someone here to see me? asks about a person, but it suggests that the answer may be yes. The same pattern appears in offers: Can I get you something? and Do you need someone to help you? These forms also show up when a question is not truly asking for open information but is checking or suggesting something already in mind.

Negative and open question uses of any forms

Usage	Explanation
Negative statement	Use anyone or anything in a negative sentence to show that the amount is zero or unknown.
Open question	Use anything in a question when you do not know what answer you will get.
Negative feeling or limit	Use anybody in a negative sentence when you mean no person at all.

Any- forms usually appear in negative sentences and in open questions. In negatives, they show that there is no person or thing at all: I do not have anything to say. There is nobody at the door. In questions, they ask without expecting a specific answer: Did you see anyone? Is anything wrong? The same pattern works with ideas and places: anyone, anything, anywhere, and anybody. For more about forms that work with open meaning, see Quantifiers and Indefinite Adjectives.

Using no forms as the negative

Idea
Use nobody without not because the pronoun already has a negative meaning.
Use nothing without not because it already means zero things.
Use nowhere without not because it already shows no place.

No- forms already carry a negative meaning, so they do not take an extra not. Say Nobody called or I found nothing, not Nobody did not call or I did not find nothing. These forms are strong and direct. They work as the negative version of someone, something, anyone, and similar words. You can use no one, nobody, nothing, nowhere, and none when you want the sentence itself to be negative without adding another negative word.

Every forms with singular grammar

Idea
Use everyone with a singular verb because it means all people in one group.
Use everything with a singular verb because it means all things together.
Use everybody with singular grammar even when the meaning is many people.

Every- forms mean all members of a group, but they look at the group one person or thing at a time. That is why they usually take singular grammar. Say Everyone is ready, Everything looks fine, and Everywhere was crowded. The verb stays singular because the pronoun acts like one idea. Everybody, everything, everyone, and everywhere are common in everyday English. They often describe a whole situation, but the grammar treats them as singular units.

Sentence positions for indefinite pronouns

Usage	Explanation
Subject position	Use an indefinite pronoun as the subject when it does the action in the sentence.
Object position	Use an indefinite pronoun as the object when it receives the action in the sentence.
Object of preposition	Use an indefinite pronoun after a preposition when it completes the prepositional phrase.

Indefinite pronouns can do the same jobs as other pronouns. They can be the subject: Someone is waiting outside. They can be the object: I saw somebody in the hall. They can also come after a preposition: This gift is for someone. We spoke about nothing. The position changes the role, not the meaning of the pronoun. In each case, the indefinite pronoun stands in for a person or thing that is not named. It can fill the same sentence slots that Subject Pronouns, Object Pronouns, and Interrogative Pronouns can fill in other structures.

Verb agreement and reference with indefinite pronouns

Idea
Use a singular verb with most indefinite pronouns because they usually act like one unit.
Use they in everyday English when an indefinite pronoun refers to one person in a general way.
Use singular grammar in formal writing when the reference is general and not specific.

Most indefinite pronouns take a singular verb: Everyone knows, Someone wants, Nothing matters. Even when the meaning is plural, the grammar is usually singular. In everyday English, some of them can later be referred to by they: Someone left their bag, and they will come back for it. This is common when the person is unknown or when the speaker does not want to name gender. The singular verb stays with the indefinite pronoun, while they refers back to the same unknown person in the next clause.

Some patterns appear again and again in normal speech. Someone is starts a sentence about an unknown person: Someone is at the door. Something is introduces an unknown thing or idea: Something is wrong with the car. Nobody likes shows a negative idea about people: Nobody likes cold coffee. Anything can and everything can also appear often: Anything can happen, Everything is ready. These fixed shapes help you use indefinite pronouns quickly in real conversation, especially when the person or thing is not named.