First Rule:
We all know this is the first rule for the plural form of most nouns, you have to add "s"
Examples:
Cat - Cats
Pen - Pens
Mug - Mugs
Book - Books
The Second Rule:
The nouns which end in x, s, ch, or s sounds, you have to add "es".
Examples:
Match - Matches
Box – Boxes
Fox - Foxes
Moss – Mosses
The Third Rule
The nouns that ending in f or fe, you must change f to v and add es.
Examples:
Wolf – Wolves
Leaf – Leaves
Wife – Wives
The Fourth Rule
There are some nouns that have different plural forms
Examples:
Woman – Women
Mouse – Mice
Goose – Geese
The Fifth Rule
The nouns That are ending in vowels like y or o, do not have definite rules.
Examples:
Toy – Toys
Baby – Babies
Potato – Potatoes
Stereo – Stereos
The Sixth Rule
There are few nouns that have the same singular and plural forms so you have to remember them as they are.
Examples:
Deer – Deer
Sheep – Sheep