Pronouns
A pronoun is a word that takes the place of a noun in a sentence.
There are different types of pronouns.
Personal pronouns  are subject pronouns when they take the place of a noun as the subject of a sentence (I, you, he, she, it, we, and they), and object pronouns when they take the place of a noun as the object of a sentence (me, you, him, her, it, us, them).
Օրինակ
I (subject pronoun) met him  (object pronoun) in the street.
Possessive pronouns take the place of possessive nouns and show who or what owns or has something.
Possessive pronouns my, your, his, her, its, our, their come before a noun. This is my book.
Possessive pronouns mine, yours, his, hers, its, ours, theirs appear without a noun. This book is mine.
 
Indefinite pronouns (some, any, and no) show an indefinite quantity of something, an indefinite number of people or things. We use some in affirmative sentences (+), any in interrogative (?) and negative sentences (-), and no in negative sentences.
Օրինակ
There are some flowers in my garden.
Are there any flowers in my garden?
There are not any/no flowers in my garden. 
We also use some in questions that are requests or offers. Would you like to buy some cakes?
  
Demonstrative pronouns (this - these, that - those) show distance - this and that  take the place of singular nouns; these and those take the place of plural nouns.
Օրինակ
This is very interesting. You can see that from here.
Interrogative pronouns (who, whom, whose, what, which) are used to ask questions.
Օրինակ
What are you doing? 
 Personal Pronouns    
Possessive Pronouns 
subject pronouns
 object pronouns
 before a noun  
without a noun
me 
my 
mine 
you 
you 
 your
yours 
he 
 him
his 
his 
she 
 her
her 
hers 
 it
 it
its 
its 
we 
us 
 our
ours 
you 
you 
your 
yours 
 they
them 
their 
theirs
 
Indefinite Pronouns
some 
(affirmative sentence) (+)             
any 
      (interrogative) (?)   
no
      (negative) (-)
There are some books
on the table.
Are there any books
on the table?
There are  not any/no  books
on the table.