Spelling Rules for Plural Nouns
Nouns have both singular and plural forms.
Singular means one. Plural means more than one.
one book   two books
one car   two cars
To make the plural form of most nouns simply add an ~s to the end of the noun. Some nouns require that you change the ending of the word before you add an ~s. Please study the following rules carefully. They will help you learn how to correctly form plural nouns.
If the noun ends with a consonant + ~y, form the plural by changing the ~y to ~i and then add ~es
baby becomes babies
city becomes cities
If the noun ends with a vowel + y, form the plural by adding ~s.
boy becomes boys
day becomes days
If the noun ends with ~fe or ~f, form the plural by changing the ~f to ~v and then add ~s.
wife becomes wives
wolf becomes wolves
If the noun ends with ~sh, ~ch, ~ss, ~x, form the plural by adding ~es
wish becomes wishes
match becomes matches
box becomes boxes
If the noun ends with a consonant + o, form the plural by adding ~es
tomato becomes tomatoes
potato becomes potatoes
If the noun ends in a vowel + o, form the plural by adding ~s
zoo becomes zoos
radio becomes radios