English Pronoun

Pronouns are words that is used in place of a noun or noun phrase.   

Personal Pronouns are the most commonly used pronouns.

Singular personal pronouns: I, me, you, she, her, he, him, it
Plural personal pronouns: we, us, you, they, them

Example: Mary baked a cake for Joe = She baked it for him.   

Possessive Pronouns are personal pronouns that show ownership or 
possession.

Singular possessive pronouns: my, mine, your, yours, his, her, 
hers, its Plural possessive pronouns: our, ours, your, yours, 
their, theirs

Example: I found Jack's book = I found his book.   

Demonstrative Pronouns call attention to their antecedents. 
An antecedent is the word or words to which a pronoun refers.

Singular demonstrative pronouns: this, that
Plural demonstrative pronouns: these, those

Example: The big computer is his = That is his computer.   

Reflexive Pronouns reflect the action back to the noun or 
pronoun that has just been named (ends in -self or -selves).

Singular reflexive pronouns: myself, yourself, himself, herself...
Plural reflexive pronouns: ourselves, themselves, yourselves

Example: She will find it herself.   

Hint: When a pronoun is used in a sentence, it should always 
be clear to what or to whom the pronoun is referring. Too many 
pronouns in a sentence can be very confusing:  
Jack went there to do that, but he didn't know where she was. 

Pronoun/Antecedent Agreement  

A pronoun is a substitute for a noun. The pronouns or nouns 
that they refer to are called antecedents. A pronoun and its 
antecedent are in agreement if they are both singular or both 
plural.

Example: Mary finished readig her book.   
 
Frequent misuse of plural pronouns occur with two types of 
singular antecedents. They are indefinite pronouns and generic 
nouns. 

Indefinite Pronouns refer to nonspecific persons or things. 
They are any, either, everything, no one, each, anybody, 
everybody, neither, someone, anyone, everyone, none, and 
something.
 
Example: In class everyone does his or her [not their] homework.
 
Generic Nouns represent a typical member or any member of a 
group, such as a typical student or any lawyer.

Example: Every student must work hard if he or she wants to 
pass the exam. 

To correct a mistakenly plural pronoun referring to a singular 
general noun, you can do one of the three things mentioned above.

Suggestions for Working with Generic Nouns

1) Treat collective nouns as singular unless the meaning is 
clearly plural.  Collective nouns include such words as: jury, 
committee, crowd, family, audience, couple, troop, team, class.

Ordinarily the group functions as a unit, so the noun should be 
considered singular; however, if the members of the group 
function as individuals, the noun should be treated as plural.

Example: The O.J. Simpson jury has reached its decision.
Compare: The Illini crowd clapped their hands.

2) Compound antecedents connected by "and" should be treated as 
plural.

Example: Jack and Joe climbed up a hill and fetched their pail 
of water. 

3) When compound antecedents are connected by "or" or "nor" (or 
by "either...or" or "neither...nor"), make the pronoun agree with 
the nearer antecedent.

Examples:
Either Jack or Mary should be fired from her job.
Neither the art student nor the computer majors could remember 
their schedules.

Noun and Pronoun Case  

Case refers to how nouns and pronouns are used in relation to 
the other words in a sentence. The three cases are subjective, 
objective, and possessive. 
 
Subjective Case is sometimes called the nominative case. A noun 
or pronoun is in the subjective when it is used as the subject 
of the sentence or as a predicate noun. A predicate noun follows 
a form of the "be" verb, and it renames the subject of the 
sentence. Here are some examples:

Mary hopes to finish her homework tonight.

Joe danced in the statewide competition.

She is a clown. (The word clown is a predicate noun)   

Objective Case is a noun or pronoun that is used as a direct 
object, an indirect object, or an object of the preposition.

My sister prepared the dinner.

His cat crawled under the table.

The teacher gave us the money back. 

Possessive Case is a noun or pronoun that is used to show 
ownership of an object. Here are two examples:

Tom washed Mary's bag.

Where did you find his pen? 

        A Chart of Pronoun Cases 
---------------------------------------
Subjective   Objective    Possessive 
--------------------------------------- 
I            Me           My, Mine 
You          You          Your, Yours 
He           Him          His 
She          Her          Her, Hers 
It           It           Its 
We           Us           Our, Ours  
They         Them         Their, Theirs 
---------------------------------------