PRONOUN

Pronouns are small words that take the place of a noun. We can use a pronoun instead of a noun. Pronouns are words like: he, you, ours, themselves, some, each... If we didn't have pronouns, we would have to repeat a lot of nouns. We would have to say things like:

• Do you like the president? I don't like the president. The president is too pompous.

With pronouns, we can say:

• Do you like the president? I don't like him. He is too pompous.

Grammarians classify pronouns into several types, including the personal pronoun, the demonstrative pronoun, the interrogative pronoun, the indefinite pronoun, the relative pronoun, the reflexive pronoun, and the reciprocal pronoun. 

http://www.englishclub.com/grammar/pronouns.htm

Click on the topic below to understand pronoun:

Personal Pronouns 

Demonstrative Pronouns

Possessive Pronouns 

Interrogative Pronouns 

Reflexive Pronouns 

Reciprocal Pronouns 

Indefinite Pronouns 

Relative Pronouns 

Pronoun Case