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Noun Plurals
We are going to explain some rules that will help you to form the plural forms of the nouns. The general rule is to add "-s" to the noun in singular.
For example:
Book - Books
House - Houses
Chair - Chairs

When the singular noun ends in: -sh, -ch, -s, -ss, -x, -o we form their plural form by adding "-es".

For exaample:
sandwich - sandwiches
brush - brushes
bus - buses
box - boxes
potato - potatoes
When the singular noun ends in "y", we change the "y" for "i" and then add "-es" to form the plural form. But do not change the "y" for "ies" to form the plural when the singular noun ends in "y" preceded by a vowel.
For exaample:
nappy - nappies
day - days
toy - toys
However, there are many Irregular Nouns which do not form the plural in this way:
For exaample:
Woman - Women
Child - Children
Sheep - Sheep
Nouns may take an " 's " ("apostrophe s") or "Genitive marker" to indicate possession. If the noun already has an -s ending to mark the plural, then the genitive marker appears only as an apostrophe after the plural form.
For example:
my girlfriend's brother
John's house
The Browns' house
The boys' pens
Genitive case.

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In grammar, genitive (abbreviated gen; also called the possessive case or second case) is the grammatical case that marks a noun as modifying another noun. It often marks a noun as being the possessor of another noun;^[1] however, it can also indicate various other relationships than possession: certain verbs may take arguments in the genitive case, and it may have adverbial uses (see Adverbial genitive).
Placing the modifying noun in the genitive case is one way to indicate that two nouns are related in a genitive construction. Modern English typically does not morphologically mark nouns for a genitive case in order to indicate a genitive construction; instead, it uses either the 's clitic or a preposition (usually of). However, the personal pronouns do have distinct possessive forms. There are various other ways to indicate a genitive construction, as well. For example, many Afroasiatic languages place the head noun (rather than the modifying noun) in the construct state.
Depending on the language, specific varieties of genitive-noun–main-noun relationships may include:

• 
  possession (see possessive case, possessed case):
  
  • 
    inalienable possession ("Janet’s height", "Janet’s existence", "Janet’s long fingers")
    
  • 
    alienable possession ("Janet’s jacket", "Janet’s drink")
    
  • 
    relationship indicated by the noun being modified ("Janet’s husband")
    
• 
  composition (see Partitive case):
  
  • 
    substance ("a wheel of cheese")
    
  • 
    elements ("a group of men")
    
  • 
    source ("a portion of the food")