· In general, the plural is formed by adding an -s to
the end of the noun.
Example: a book - books
a house - houses
· Nouns that end with an -s, -sh, -ch and -x, as well as
certain other nouns that end with an -o form, have
a plural ending of -es.
Example: bus - buses box - boxes
dish - dishes beach - beaches
tomato - tomatoes
Insusceptible