Ingles

The possessive case of a noun or pronoun indicates ownership or possession. Pronouns such as his, her, its, my, mine, your, yours, their, theirs, our, and ours are all possessive case words.
Here are several rules for the possessive case.
A. Most singular nouns form their possessive by adding an apostrophe and an s. (the baboon's food; the girl's sweater; Marx's teachings; Burns's poeticlines; Dickens's characters)
B. To form the possessive of a singular noun that ends with an s sound, take one of two actions.
1. If a name of two or more syllables ends in an eez sound, the possessive is formed without an additional s. (Ulysses' friends; Archimedes' theories)
2. Add an apostrophe and an s if the word would not be difficult to pronounce. (dress's cost; quartz'sessence)
C. Add only an apostrophe to form the possessive of a plural noun that ends in s. (the boys' gymnasium; the Murphys' home)
D. If a plural noun does not end in s, add an apostrophe and an s. (the men's department; the mice's hiding spots)
E. Use the possessive form for only the last name in compound nouns for organizations, literary titles, businesses, and relatives. If ownedseparately, use the possessive for both names.
Tom's and Pete's reputations (separate reputations)
Procter and Gamble's sales (combined ownership)
mother-in-law's magazines (one woman's ownership)
mothers-in-law's magazines (two or more women's ownership)
A. For acronyms (words formed from the first letters of a series of words), add an apostrophe and an s.
the NHL's (National HockeyLeague's) members
AARP's (American Association of Retired People's) membership
A word used in the possessive case shows ownership. Possessive pronouns do not require apostrophes.
The singular possessive pronouns aremy, mine, your, yours, his, her, hers, and its.
The plural possessive pronouns are our, ours, your, yours, their, and theirs.
The possessive pronoun whose also does not require anapostrophe.
This house is theirs.
Their car is currently in the shop.
Your notebook and my textbook are in the school's cafeteria.
Is that package theirs or ours?
The movie has lost its appeal with her children.
His bike is locked up next to mine in your space.
Note: Though a noun that precedes a gerund (word that ends in -ing and functions as a noun) requires an apostrophe, the pronoun that doesthe same does not require one.
Nina's selecting that prize was very interesting. (Nina's, a possessive noun/adjective, requires an apostrophe.)
Her selecting that prize was very interesting. (Her, a possessive pronoun/adjective, does not require an apostrophe.)
--------------------------------------------------------------------------------------------------------------------------------Possessive Case
The possessive case of a noun or pronoun shows ownership or association.
Nearly all nouns and indefinite pronouns show possession by ending with the s sound. This is spelled with and apostrophe plus an s.
For the rules on this see the "Apostrophes" heading in the Punctuation Contents.
Examples: Francine's sweater
(The sweater owned by Francine.)
George's grandfather
(Thegrandfather associated with George.)
Possessives normally modify nouns as in the examples above, but sometimes they stand by themselves as a noun rather than as a modifier.
Example: That sweater is Francine's.
The possessive case of personal pronouns is irregular. Some possessive pronouns like my and your modify nouns. Others, like mine and yours stand alone and do not act as modifiers.
Formore on this, see Possessive Pronouns.
Possessive Pronouns
Certain pronouns called possessive pronouns show ownership. Some are used alone; some describe a noun.
Used alone: mine, yours, his, hers, ours, theirs, whose
Correct: That computer is hers.
Modify noun: my, your, his, her, its, our, their, whose
Correct: That is her computer.
Please note that none of the possessive...