Subject pronouns name the person or thing that performs the action or controls the verb in a clause. They replace a noun phrase when the speaker and listener can clearly identify the referent. In English, subject pronouns are also central to word order, verb agreement, and question formation.

English subject pronouns mark person and number. The first person refers to the speaker, the second person refers to the listener, and the third person refers to someone or something else. Singular forms are used for one referent, while plural forms are used for more than one referent.

Idea	Example
First person singular is I.	I run.
Second person singular is you.	You listen.
Third person singular is he, she, or it.	She smiles.
First person plural is we.	We study.
Second person plural is you.	You arrive.
Third person plural is they.	They work.

Subject pronouns usually come before the main verb in a statement. This placement helps show who or what is doing the action. In imperative clauses the subject is normally omitted because you is understood, and dummy subjects such as it and there can occupy subject position without naming an agent.

Idea	Example
The subject pronoun usually comes before the main verb.	They read daily.
Imperatives usually omit the subject.	Open the door.
It can work as a dummy subject.	It is cold.
There can work as a dummy subject.	There is a chair.

In the present simple, the verb usually adds s with third person singular subjects. Other subject pronouns normally use the base verb form. Compound subjects joined by and are usually plural, while subjects joined by or agree with the nearest sensible subject in many everyday patterns.

Idea	Example
Third person singular usually takes s on the verb.	He walks home.
Other subject pronouns usually take the base verb.	We walk home.
Two subjects joined by and are usually plural.	Ana and Ben walk home.
Subjects joined by or often agree with the nearest subject.	My sister or my parents are here.

In yes no questions, the auxiliary moves before the subject pronoun. The subject pronoun itself does not change form. In do support questions and negatives, the main verb stays in base form and the auxiliary carries the question or negation.

Idea	Example
The auxiliary comes before the subject pronoun in questions.	Do you like tea?
The subject pronoun keeps the same form in questions.	Is she ready?
Negation uses not with the auxiliary.	I do not know.
The main verb stays in base form after do support.	He does not play.

A subject pronoun replaces a noun phrase when its antecedent is clear in the context. This substitution avoids repetition while keeping the meaning precise. Pronoun choice depends on person, number, and sometimes natural gender or a nonhuman reference.

Idea	Example
A pronoun can replace a clear noun phrase.	Maria arrived, and she sat down.
She commonly refers to a female person.	Lisa said she would call.
He commonly refers to a male person.	Tom said he was late.
It commonly refers to a thing or an animal when gender is not relevant.	The cat was hungry, so it ate.

Subject pronouns can be stressed for emphasis or contrast, especially when two possibilities are being compared. In formal style, subject position after forms of be may use subject pronouns such as It is I, while everyday speech often prefers It's me. Singular they is common when a person is unknown, when gender is irrelevant, or when a speaker prefers a nonbinary reference.

Idea	Example
Stress can mark contrast between two subjects.	I finished, not he.
Formal style may prefer subject pronouns after be.	It is I.
Everyday speech often uses object forms after be.	It's me.
Singular they can refer to one person with unknown or unspecified gender.	If anyone calls, they should wait.
Regional speech may use you guys or yall for plural you.	You guys are ready.

Subject pronouns are the forms used for sentence subjects: I, you, he, she, it, we, and they. They signal person and number, usually appear before the main verb, and control agreement in the present tense. They also shift with clause type, since questions, negatives, imperatives, dummy subjects, and contrastive emphasis can change how the subject is expressed.