Pronouns

A pronoun is a word used in place of the noun. As pronouns can be used in place of nouns, they avoid the monotonous repetition of nouns. Many of the language errors that are commonly made are errors in the use of pronouns. Mistakes occur because some of the pronouns that we use constantly have a number of diffrent forms.

There are 5 groups or classes of pronouns in English:
personal
interrogative
demonstrative
indefinite
relative